Sixty fitness calculators sit in this hub, organised across nine domains: body composition, calorie planning, weight management, muscle gain, strength, fitness testing, cardio, recovery, and unit conversion. The promise is not a magic number from any single tool. It is a repeatable loop: measure where you start, plan the energy you need, prescribe a training intensity, then check the recovery cost. Revise next month. This page is for the reader who wants to run their training the way a coach would, with specific numbers attached to every decision.

Why Measure Anything at All
Body Composition: Where You Are Right Now
Calories and Macros: The Energy Equation
Weight Management: Trajectories, Not Snapshots
Muscle Gain: Calorie Surplus With Receipts
Strength: How Heavy Is "Heavy Enough"
Testing: Fitness as a Mortality Predictor
Cardio: From Pace to Mortality Risk
Recovery: The Half You Are Probably Skipping
Units: The Boring Section That Saves You Mistakes
How to Pick Your First Calculator
Two Journeys, Five Calculators Each
Common Pitfalls When Stacking Calculators
What This Category Doesn't Cover
FAQ
Methodology and Sources
Next Step

Why Measure Anything at All

You can train for a decade and still have no idea whether your routine is doing what you think it is.

Self-reported effort is a poor proxy for actual training stress. The Cooper Institute cohort followed 13,344 adults for 8 years and found that the lowest cardiorespiratory fitness quintile had a mortality rate 3.4x higher than the highest, independent of body weight or smoking status (Blair et al., 1989, JAMA, vol. 262 no. 17). A treadmill test gave that data; nobody's perceived effort did.

Numbers do not motivate; numbers diagnose. The right metric tells you the difference between needing more volume and needing more recovery, between under-eating and over-eating, between actual progress and the placebo effect of having tried hard. The sixty calculators in this hub each produce one such number, sourced from peer-reviewed work: Mifflin-St Jeor for metabolism, Riegel for race pacing, Karvonen for heart-rate prescription, ACSM for resistance-training standards. Below is the full map of which one to run when.

Body Composition: Where You Are Right Now

The first decision in any fitness plan is honest. Not "what do I want to weigh?" but "what is my actual current body composition, and is anything about it a flag?" The ten tools in the body composition sub-section of this hub answer that question with formulas tracing back to the 1960s and forward to current ACSM updates.

Start by running your BMI against the WHO 18.5–24.9 healthy range, the cheapest screening signal in adult health and valid for roughly 85% of the population. If BMI flags you as overweight or obese, the Navy or Jackson-Pollock approach to body-fat percentage tells you whether that mass is fat or muscle. For lifters specifically, the Fat-Free Mass Index that adjusts lean mass for height is the single number distinguishing "muscular" from "fat in a tight shirt"; most natural lifters cap around 25 kg/m².

Where BMI fails (athletes, frailty-stage older adults, asymmetric body composition), distribution metrics step in. Waist-to-hip ratio above 0.90 in men or 0.85 in women predicts cardiovascular risk independently of BMI, per WHO criteria. The waist-to-height ratio with the 0.5 cut-off is an even simpler stand-in. Round out the picture with an explicit lean-body-mass figure for protein-dosing math.

This section becomes insufficient the moment you need to act on the number. Knowing your body-fat percent does nothing without an energy plan. That is the next domain.

Calories and Macros: The Energy Equation

Once you know roughly what you weigh in lean tissue, you can stop guessing what to eat. Energy planning splits into two questions: total daily calories, and how to divide those calories across macronutrients.

For the calorie total, estimate your TDEE from BMR plus an activity multiplier, grounded in the Mifflin-St Jeor 1990 equation and accurate within ±10% for most adults. If you want the resting baseline only (useful for tracking metabolic adaptation during a long diet), run your BMR in isolation. For people whose weight has been stable for months, the maintenance-calorie estimate is a cleaner anchor than TDEE because it does not depend on a self-rated activity level.

Macro splits matter more than people expect once calories are correct. Get a complete macro target with adjustable protein/fat/carb percentages, or build the split component by component. The standard sequence is protein first at 1.6 to 2.2 grams per kg of bodyweight for most adults, then fat at no less than 0.6 g/kg for hormone health, with carbohydrates filling the remaining calorie budget. Ketogenic dieters have their own math: the keto-specific macro split forces fat above 70% of calories and caps net carbs at 20 to 50 g/day.

Two small tools fold into this loop. Hit a per-day water target tied to body weight and climate; most adults need 30 to 40 ml per kg. And before logging a homemade meal, back-solve the calories from raw macro grams so you stop trusting restaurant menu numbers.

Weight Management: Trajectories, Not Snapshots

Body composition tells you where you are; the weight management sub-section tells you whether the line is moving. Six calculators support the long arc of fat loss or gain.

The starting point depends on whether you have a destination. If you do, set a calorie deficit sized for a target rate of loss, then check how many weeks at that deficit it takes to reach your goal body fat percentage. If you have only "less fat" as a goal, work backwards: pick a goal weight from a healthy BMI band and frame size or run an ideal-weight estimate across the Devine, Hamwi, Robinson, and Miller formulas to compare. The four-formula comparison is honest: ideal weight is not a single number, it is a range.

While the diet is in progress, confirm the daily calorie gap is what you think it is, recomputed monthly as bodyweight changes. The weight-lost-as-percentage framing is the right one for long stretches: 5% body-weight loss is the clinically meaningful threshold for blood-pressure and insulin-sensitivity improvements, and percentages compare cleanly across people.

Weight management calculators alone do not tell you whether the loss is fat or muscle. For that, pair these tools with body composition and use the body-fat trend as the real progress signal.

Muscle Gain: Calorie Surplus With Receipts

Bulking is harder to do well than cutting. Too small a surplus and nothing grows; too large and you spend the next six months cutting back the fat you added. Four calculators bracket the math.

The bulking calculator outputs a daily calorie and macro target sized for a 200 to 500 kcal surplus, with the smaller end favoured by anyone past their first two years of training (the muscle-gain ceiling drops to roughly 0.25 kg per month after that point). The lean-bulk variant clamps the surplus at the conservative end for users who would rather take longer than wear the fat. Recomposition planning is a third path entirely, with calorie and macro targets calibrated for simultaneous fat loss and muscle gain. This works mainly for novices, returnees, and overweight beginners; for everyone else, it is fiction.

To set realistic expectations on the calendar, estimate the months required to add a target amount of lean mass. The honest answer for an intermediate lifter is around 0.2 kg of muscle per month, capped lower for women.

These tools become misleading the moment you stop measuring body composition alongside the scale. A surplus that grows you mostly fat is not a successful bulk; rerun body-fat tracking every four weeks to catch this early.

Strength: How Heavy Is "Heavy Enough"

Strength training calculators answer one practical question every workout: what weight should be on the bar today? Nine tools in the strength sub-section cover prescription, autoregulation, comparison, and the math of plate loading itself.

Start with the ceiling. Project your one-rep max from a sub-max set using Epley, Brzycki, Lombardi, and three other formulas. Comparing across formulas tells you the prediction's uncertainty, which is roughly ±5%. From the 1RM, the percentage-of-1RM-to-RPE table replaces tested maxes with autoregulated daily targets so a bad-sleep day does not turn into a missed lift. For coaches running velocity-based programs, the bar-speed-to-intensity conversion ties the prescription directly to today's force output.

Comparison tools matter once raw weight stops being meaningful. The Wilks coefficient normalises powerlifting totals across body weight; DOTS is the 2020 successor used by the IPF; and for non-competitors, strength-standards-by-bodyweight benchmarks tell you whether a 1.5x bodyweight squat puts you at the novice or intermediate band.

The mundane tools count too. The volume-load formula (sets × reps × weight) is the best single progress metric for hypertrophy when ramped 5 to 10% per week. The warm-up ladder builds a 5-set ramp from empty bar to working weight so you stop guessing the jumps. And the plate-loading calculator tells you exactly which discs to slide on each side. Small, useful, used in every gym in the world.

Testing: Fitness as a Mortality Predictor

The seven calculators in the fitness testing sub-section all share an unsettling property: each one's output predicts how long you will live, independent of every other factor.

VO2 max, the maximal volume of oxygen the body can use per minute per kg of bodyweight, is the strongest single longevity predictor in epidemiology. The Cooper data referenced earlier puts the bottom-quintile vs top-quintile mortality gap at 4.5x for men and 4.7x for women (Mandsager et al., 2018, JAMA Network Open). Estimate it from the 1.5-mile run, Rockport walk, or treadmill protocols there, or convert your beep-test level and shuttle count to VO2 max using the Léger formula.

Strength predicts mortality too. Grip strength specifically tracks cardiovascular and all-cause death risk: a 5-kg drop in grip predicts a 17% rise in CV mortality, per the PURE study of 139,691 adults across 17 countries (Leong et al., 2015, The Lancet). The push-up test correlates similarly; men under age 40 who could do 40+ push-ups had a 96% lower CV-event rate than those under 10 (Yang et al., 2019, JAMA Network Open).

Power and mobility complete the picture: the vertical-jump test for lower-body power output, the sit-and-reach test for hamstring and lower-back flexibility, and a timed sit-up test for core endurance round out the assessment battery. Run all seven once, then reassess every quarter.

Cardio: From Pace to Mortality Risk

Cardio is where fitness most directly translates into longevity. The five tools in the cardio sub-section handle pace, intensity, and prediction.

Prescription starts with the heart. Set five heart-rate training zones from the Karvonen reserve method or the 220-minus-age estimate using your max heart rate as the anchor. Zone 2 (60 to 70% of max) is where most weekly volume should sit; Zone 4 and 5 are the spike work. Three to four hours a week of Zone 2 is the dose with the strongest VO2-max-improvement data.

For runners, output reads in pace, not heart rate. Convert run time and distance into pace per km and per mile, then project a marathon or 10k finish time from a recent shorter race using the Riegel formula. Riegel is accurate within about 2 to 3% for distances between 5 km and the half-marathon, drifting wider on either side.

Behind all of this, the calories-burned-per-activity estimate from the MET-value compendium or heart-rate formula feeds back into the calorie-planning loop. A 70-kg runner burns roughly 70 kcal per km. Use this estimate to revise your TDEE upward on training days.

Recovery: The Half You Are Probably Skipping

Training stress without recovery is just stress. The recovery sub-section covers the six calculators that close the loop.

Sleep is the foundation. Calculate bedtime or wake-time around 90-minute sleep cycles so you stop waking mid-REM groggy; most adults need 5 to 6 complete cycles, which is 7.5 to 9 hours. Beyond sleep, the rest-day calculator works backwards from training intensity, experience level, and sleep quality to recommend a weekly rest-day count. New lifters need fewer recovery days than they think; older intermediates often need more.

The substances side matters. Tally daily caffeine across coffee, tea, supplements, and pre-workout against the EFSA 400 mg/day adult ceiling, and count alcohol calories that quietly wreck a calorie deficit. A single pint of 5% beer is about 215 kcal, mostly carbohydrate-equivalent.

Two more close out the picture. The muscle-group recovery-time estimate gives an hours-to-resensitisation number per muscle group based on training volume and intensity, useful for setting split frequency. And the creatine loading and maintenance dose calculator walks through the 0.3 g/kg/day loading phase and 5 g/day maintenance phase backed by the ISSN position stand.

This section stops being enough when sleep itself becomes the variable. If you suspect chronic sleep debt, the validated PSQI sleep-quality index in our health hub gives you a severity score from seven component ratings.

Units: The Boring Section That Saves You Mistakes

Three unit tools live in the utility sub-section. They are not glamorous but they prevent the largest source of fitness-planning errors: mixed units.

Convert kilograms to pounds and back with the exact 0.453592 factor when reading research papers from one country and watching coaches from another. Translate pace between min/km and min/mile, plus to km/h and mph when treadmill displays disagree with watch outputs. Translate daily step counts into kilometres and miles using a height-adjusted stride length when a tracker reports only the step total.

How to Pick Your First Calculator

The right starting point depends on your current state. Use the matrix below to skip the trial-and-error.

If your starting state is...	Run this first	Then chain to	Why this order
Untrained, weight unknown	BMI calculator	TDEE → macro split	BMI is the cheapest first signal; energy planning depends on body weight you just confirmed.
Trained, want to recomp	Skinfold body-fat baseline	Body-recomp → protein intake	Recomp depends on body composition baseline, not weight.
Returning after long break	Push-up test for upper-body baseline	Strength standards → 1RM projection	Test before prescribing; absolute weight prescriptions need a current ceiling.
Race in 12 weeks	VO2 max estimate	Heart-rate zone → race-time predictor	Zones depend on max HR or VO2; predicted time anchors the training pace.
New diet, first week	Maintenance calorie estimate	Weight-loss → meal calorie	Anchor the deficit on a real maintenance number, not a guessed one.
Comparing bench/squat/deadlift	Strength standards by bodyweight	Wilks → DOTS	Standards answers "am I weak/average/strong?"; Wilks and DOTS answer "how do I rank?"
Heavy session today, slept badly	RPE-to-percentage table	Workout volume	Autoregulate down before the warm-up so you do not crash on the working set.
Tracking a 6-month cut	Weight-loss percentage tool	Body fat → calorie deficit revision	Percentages flatten week-to-week noise; revise the deficit as bodyweight drops.

Two Journeys, Five Calculators Each

Theo, 21, "Lose the Gut, Keep the Bench"

Theo measures 178 cm and 88 kg. He has been bench-pressing for three years and benches 100 kg for one rep.

BMI = 27.8. That puts him in the WHO overweight band, but he is muscular, so the next check is body composition.
Navy-method body fat: waist 90 cm, neck 39 cm gives 18.2%. That is "average for an active male" by ACSM bands, not overweight in any meaningful sense, but he wants to be lean (under 14%).
TDEE at "moderately active" (3 to 5 lifting sessions a week plus walking): 2,705 kcal/day.
He wants to lose 5 kg of fat over 14 weeks. The deficit calculator for 0.36 kg/week loss: 400 kcal deficit, so 2,305 kcal/day. Protein at 1.8 g/kg: 158 g/day. The rest split 25% fat, 60% carb to preserve strength.
To make sure strength does not drop, he runs the RPE-to-percentage table. At 95 kg working weight (95% of max), he stays in the RPE 7 to 8 zone instead of training to failure. Volume stays at 12 sets per major lift per week.

Honest critique: Theo skipped recovery planning. By week 8 he hit a sleep-debt wall. A sleep cycle plan and a tighter caffeine cap before noon would have prevented the strength regression he then mistook for muscle loss.

Anya, 52, Postmenopausal, Bone Density Newly Flagged

Anya is 165 cm, 64 kg, recently had a DEXA scan showing osteopenia (T-score -1.4 at the hip). Her GP recommended weight-bearing exercise.

Grip strength against age-and-sex norms: 22 kg right hand. That is at the 20th percentile for women 50 to 54. Sit-and-reach flexibility: -5 cm, below average.
VO2 max from the Rockport walk test: 26 ml/kg/min, "fair" for her age band, useful for setting Zone 2 pace.
To build the strength side, she needs absolute weights. Strength standards by bodyweight for a 64-kg untrained woman put the novice squat at 30 kg and the deadlift at 38 kg. The plate-loading calculator tells her to load one 10 kg plus one 5 kg per side for a 30 kg squat (including the 20 kg bar).
Each session, a five-set warm-up ramp from empty bar to 30 kg prevents missed sets. She tracks weekly load with the volume calculator and adds 5 to 10% per week.
For recovery between sessions, the recovery-time estimate flags 48 to 72 hours between heavy lower-body sessions at her age and training experience. She runs 3 sessions per week with full days off between.

Honest critique: Anya did not link this back to her bone-density goal. The FRAX 10-year fracture risk score and the ORAI osteoporosis screening tool in our health hub would have given her a baseline number to track against the next DEXA. Without that anchor, the gym numbers feel disconnected from the medical context.

Common Pitfalls When Stacking Calculators

Trusting one number when you have evidence for two. A 95 cm waist tells you something BMI does not. If two metrics disagree (BMI of 23 paired with a 0.95 waist-to-hip ratio), the disagreement is the signal, not noise. The army body-fat method using tape measurements can serve as a tiebreaker against skinfold-based estimates because the errors come from different sources.

Double-counting calories burned during exercise. TDEE multipliers already include a "moderately active" or "very active" allowance for training. Adding the calories-burned estimate on top can overestimate by 300 to 600 kcal/day. Pick one method per day: TDEE-multiplier OR baseline-plus-workout calories, not both.

Recalculating too rarely. TDEE drops by roughly 25 kcal for every 1 kg of body weight lost. After 5 kg down, your calorie target is 125 kcal too high if you have not rerun the math. Rerun TDEE and your deficit every 4 to 6 weeks during a cut.

Comparing percentile metrics across age cohorts. A 30-year-old in the 50th percentile for VO2 max has dramatically higher absolute fitness than a 60-year-old in the 50th percentile (47 vs 30 ml/kg/min). Use percentile data for trend tracking within your own age band.

Using strength standards from a different population. A "novice" bench press at 1.0x bodyweight in one chart is a "beginner" lift in another. The standards reference here uses the StrengthLevel database of 200K+ submitted lifts; results from gym posters or older textbooks reflect different populations.

Ignoring the recovery side of the equation. A 14% increase in weekly volume that breaks your sleep is a net loss. The body-measurements tracker can spot lean-mass loss before the scale does, but only if you actually use it weekly. Recovery metrics like sleep, rest days, and recovery time are not optional inputs to programming; they ARE the programming.

What This Category Doesn't Cover

The fitness calculators here stop at performance, body composition, and lifestyle inputs. They do not screen for the medical conditions that fitness improves, and they do not dose the medications people sometimes use alongside training. If you suspect insulin resistance, want a cardiac-event risk number, need bone-density screening, or want validated mental-health metrics that often improve with exercise, those tools live in the health calculators pillar. The single most important cross-link from this hub is to that page.

Methodology and Sources

Every formula links back to its primary source. Mifflin-St Jeor (American Journal of Clinical Nutrition, 1990) anchors metabolic calculations. ACSM (American College of Sports Medicine) guidelines anchor strength standards, exercise prescription, and warm-up protocols. WHO BMI cut-offs and IOM macro recommendations anchor body-composition and nutrition tools. The 1RM family uses the original Epley (1985), Brzycki (1993), and Lander (1985) papers; the Riegel race-time formula traces to Riegel (1981, American Scientist). The Karvonen heart-rate reserve method comes from Karvonen et al. (1957, Annales Medicinae Experimentalis et Biologiae Fenniae).

These calculators are informational. They do not diagnose, treat, or prescribe. A trained clinician's judgment overrides any number on this site, particularly for body composition in athletes, pregnant women, or anyone with a chronic condition. The numbers are starting points for a conversation, not endings.

Next Step

The fastest way to test whether this hub helps is to run one calculator today. Most beginners get the most leverage from planning a single week's calorie deficit. Most lifters get the most leverage from a fresh strength-standards check. Run the one that fits your current question; the rest of the hub gets cheaper to use once you have one number in hand.

About fitness calculators.

Which fitness calculator should I run first?

Start with your TDEE estimate if you have a weight or performance goal; the entire energy plan downstream depends on it. If you do not have a clear goal, run the body-composition trio first (BMI, body-fat percentage, waist-to-height ratio) so you know what state you are starting from. Most people skip the second path and end up planning toward a target that does not fit them.

How accurate are these fitness calculators?

Each tool cites its source formula and study. Most have a known error band: Mifflin-St Jeor TDEE is plus/minus 10% for adults, Navy-method body fat is plus/minus 3 to 4% absolute, Riegel race-time projections are plus/minus 2 to 3% in the 5K-to-half range. They are accurate enough to plan training around, but not precise enough to detect a 1% body-fat change month-to-month.

Which body-fat method is most accurate at home?

The Jackson-Pollock skinfold method using calipers is the most accurate at-home option, with plus/minus 3% error vs DEXA when measured by the same person across time. The Navy circumference method is less precise (plus/minus 4 to 5%) but does not require equipment. Consistency in measurement matters more than the absolute number.

Do I need to recalculate my TDEE every month?

Recalculate after every 4 to 5 kg of body weight change, or every 6 weeks during an active cut or bulk. Your TDEE drops about 25 kcal per kg lost, so a 5 kg cut means your old daily calorie target is now 125 kcal too high. If weight has been stable for over three months, the maintenance-calorie tool is a cleaner re-anchor than rerunning TDEE.

Why do different 1RM formulas give different numbers?

Each formula was fit to a different population. Epley overestimates at low reps, Brzycki and Lombardi disagree above 5 reps, Lander targets the 1-to-10-rep range tightly. Treat the spread between formulas as the prediction interval. If the 1RM tool shows a 100 to 110 kg range from a 5-rep set, that 10 kg gap is your real uncertainty.

How often should I retest my VO2 max?

Retest every 12 weeks during a structured training block; meaningful change takes about 8 weeks to appear. Use the same protocol each time (Cooper 1.5-mile or Rockport walk) so results compare cleanly. Beginners can expect a 10 to 20% rise in the first three months of consistent training; advanced athletes see 1 to 3% per year.

Are the calorie-burned estimates accurate?

Activity-based MET estimates have a 25% error vs lab measurement. Heart-rate-based estimates are tighter (plus/minus 10 to 15%) but require an accurate max heart rate. Gym-equipment displays typically overestimate by 15 to 30%. Use these tools to bracket the answer, not pinpoint it; the calorie-deficit math holds at a weekly average, not a single-session level.

Should I trust BMI if I'm muscular?

BMI is unreliable above roughly 25 kg/m squared for trained lifters; muscle mass inflates the number without indicating fat. Use an FFMI above 22 kg/m squared as the muscular-not-fat threshold when BMI flags you as overweight. For non-lifters, BMI is reasonable; for someone with a 1.5x bodyweight bench, BMI alone is misleading and body fat percentage is mandatory.

What's the best fitness calculator for beginners?

Beginners should start with three: TDEE so they stop guessing calories, a body-composition check (BMI plus body fat for context), and a push-up test for a fitness baseline. Those three answer where am I, what do I eat, what should I be able to do without overwhelming the user. Add a protein-intake target once those three are in place.

Can these tools replace a personal trainer?

No, and they are not designed to. Calculators give numbers; coaches apply judgment. The 1RM projection cannot tell you whether your squat technique is failing under load. The TDEE estimate cannot tell you that your tracking is selectively forgetting weekend snacks. Use these as the data layer; use a coach for the judgment layer.

How do you know if you're losing fat or muscle on a cut?

Track three things together: scale weight, body fat percentage every two weeks (use the same method you ran for your baseline), and a strength benchmark (your top 3-rep weight on one main lift). If body fat is dropping and the strength number holds, you are losing fat. If both drop, you are losing muscle. Most muscle loss happens when protein intake falls below 1.6 g/kg or the deficit exceeds 25% of TDEE.

Which calculators should I use during pregnancy?

The calorie-planning tools here are not calibrated for pregnancy. Use the pregnancy weight-gain tool in the health hub, which applies the IOM 2009 ranges by pre-pregnancy BMI. Keep the daily-water target check and the sleep-cycle planner as normal, but pause bulking, cutting, and 1RM calculators until postpartum.

Fitness calculators

Explore all 60 fitness calculators across 9 sub-categories. Every formula links back to its source.

60 calculators9 sub-categoriesFree · instant · private

Body Composition & Metrics

10 calculators in body composition & metrics.

BMI

BMI Calculator

Calculate your Body Mass Index to assess if your weight is healthy for your height.

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Body Fat Calculator

Estimate your body fat percentage using the U.S. Navy method or BMI-based formula.

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SBF

Skinfold Body Fat Calculator

Estimate body fat percentage using the Jackson-Pollock 3-site or Durnin-Womersley 4-site skinfold method.

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LBM

Lean Body Mass Calculator

Calculate your lean body mass using three different formulas for comparison.

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F(MI

FFMI Calculator (Fat-Free Mass Index)

Calculate your Fat-Free Mass Index to evaluate muscularity relative to height.

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Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio to assess health risk from body fat distribution.

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Waist-to-Height Ratio Calculator

Calculate your waist-to-height ratio as a simple indicator of health risk.

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Body Type Calculator

Determine your body frame size based on wrist circumference and height.

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BMT

Body Measurements Tracker Calculator

Track key body measurements and calculate proportional ratios for balanced physique assessment.

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ABF

Army Body Fat Calculator

Estimate body fat percentage using the U.S. Army circumference-based method.

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Nutrition & Calorie Planning

10 calculators in nutrition & calorie planning.

C/T

Calorie / TDEE Calculator

Calculate your Total Daily Energy Expenditure based on BMR and activity level.

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BMR

BMR Calculator

Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation.

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Maintenance Calorie Calculator

Find your daily maintenance calories to maintain your current weight.

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MACR

Macro Calculator

Calculate your daily macronutrient targets based on your calorie goal and preferred split.

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Protein Intake Calculator

Calculate your recommended daily protein intake based on body weight and fitness goal.

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Carb Intake Calculator

Calculate your daily carbohydrate needs based on your calorie target and activity level.

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Fat Intake Calculator

Calculate your recommended daily fat intake based on calorie target and health goals.

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KETO

Keto Calculator

Calculate your ketogenic diet macros for optimal fat adaptation.

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Meal Calorie Calculator

Estimate the total calories of a meal from its macronutrient content.

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Water Intake Calculator

Calculate your recommended daily water intake based on body weight and activity level.

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Weight Management

6 calculators in weight management.

Weight Loss Calculator

Calculate how many calories to eat daily to reach your weight loss goal.

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WLP

Weight Loss Percentage Calculator

Calculate the percentage of body weight you have lost.

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Goal Weight Calculator

Calculate a healthy goal weight based on your height, age, and frame size.

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Ideal Weight Calculator

Calculate your ideal body weight using multiple established formulas.

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FLT

Fat Loss Timeline Calculator

Estimate how long it will take to reach your target body fat percentage.

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Calorie Deficit Calculator

Calculate the exact calorie deficit needed to lose weight at your desired rate.

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Muscle Gain & Body Recomposition

4 calculators in muscle gain & body recomposition.

BULK

Bulking Calculator

Calculate your daily calorie and macro targets for a muscle-building bulk.

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Body Recomposition Calculator

Calculate calorie and macro targets for simultaneous fat loss and muscle gain.

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BRT

Body Recomp Timeline Calculator

Estimate a realistic timeline for body recomposition based on your starting point and experience.

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Lean Bulk Calculator

Calculate a conservative calorie surplus to maximize muscle gain while minimizing fat gain.

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Strength & Resistance Training

9 calculators in strength & resistance training.

1RM

1RM Calculator

Estimate your one-rep max from a submaximal lift using five different formulas.

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VBT

Velocity Based Training Calculator

Estimate training intensity zones based on barbell velocity for autoregulated training.

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Workout Volume Calculator

Calculate total training volume (sets x reps x weight) for your workout.

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Wilks Score Calculator

Calculate your Wilks score to compare powerlifting performance across weight classes.

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Strength Standards Calculator

Compare your lifts against strength standards for your body weight and gender.

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RTP

RPE to Percentage Calculator

Convert Rate of Perceived Exertion (RPE) to percentage of 1RM for programming.

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Weightlifting Warm-Up Calculator

Generate a warm-up set scheme leading up to your working weight.

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Plate Loading Calculator

Calculate which weight plates to load on each side of the barbell.

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DOTS

DOTS Calculator

Calculate your DOTS score for modern powerlifting performance comparison across weight classes.

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Fitness Testing & Performance

7 calculators in fitness testing & performance.

Push-Up Test Calculator

Assess your upper body muscular endurance based on push-up test results.

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Grip Strength Calculator

Evaluate your grip strength against age and gender norms.

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Vertical Jump Calculator

Assess your lower body power using vertical jump height.

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Flexibility Test Calculator

Assess your hamstring and lower back flexibility using the sit-and-reach test.

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VO2 Max Calculator

Estimate your maximum oxygen uptake from various fitness tests.

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Beep Test Calculator

Estimate your VO2 Max from the multi-stage fitness (beep) test level and shuttle count.

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Sit-Up Test Calculator

Assess your core muscular endurance using a timed sit-up test.

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Cardio & Endurance

5 calculators in cardio & endurance.

Running Pace Calculator

Calculate your running pace, speed, and predicted race times using the Riegel formula.

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Calories Burned Calculator

Estimate calories burned during exercise using MET values or heart rate data.

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HRZ

Heart Rate Zone Calculator

Calculate your heart rate training zones based on max heart rate.

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MHR

Max Heart Rate Calculator

Estimate your maximum heart rate using multiple established formulas.

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RTP

Race Time Predictor

Predict race finish times at various distances from a recent race result.

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Recovery & Lifestyle

6 calculators in recovery & lifestyle.

SLEE

Sleep Calculator

Calculate optimal bedtime or wake-up time based on sleep cycles.

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Rest Day Calculator

Estimate optimal rest days per week based on training intensity and recovery factors.

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CAFF

Caffeine Calculator

Calculate your daily caffeine intake and check if it is within safe limits.

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Alcohol Calorie Calculator

Calculate the calories from alcoholic beverages.

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Recovery Time Calculator

Estimate muscle group recovery time based on training intensity and volume.

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Creatine Loading Calculator

Calculate creatine monohydrate loading and maintenance doses based on body weight.

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Utility & Converters

3 calculators in utility & converters.

STM

Step to Miles Calculator

Convert your daily step count to distance in miles and kilometers.

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KTLC

Kg to Lbs Converter

Convert between kilograms and pounds instantly.

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Pace Converter (min/km ↔ min/mile)

Convert running pace between min/km and min/mile and calculate speed.

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