About Calorie / TDEE Calculator
7 min read
Calorie and TDEE Calculator: Find Your Daily Intake for Any Goal
TL;DR: Most adults need between 1,600 and 3,200 calories per day at maintenance, depending on size and activity level. This calculator uses the Mifflin-St Jeor BMR formula multiplied by an activity factor to produce your TDEE (Total Daily Energy Expenditure), then applies a deficit or surplus to give you a calorie target matched to your specific goal.
Table of Contents
- Your Body Has a Budget. Here's How to Find It
- Six Reasons Your Previous Calorie Target Was Wrong
- BMR Equations and the Activity Multiplier: How the Numbers Are Built
- How to Use the Calculator in Six Steps
- See the Calculation Run: Two Complete Examples
- Five Calorie Counting Mistakes That Stall Progress
- FAQ
- Assumptions and Notes
- After You Get Your Number
- Further Reading
Your Body Has a Budget. Here's How to Find It
Your body spends calories continuously. Every hour, resting organs claim the largest share: the brain uses roughly 20% of daily energy despite being 2% of body weight, the liver another 20%, and the rest distributed across muscle, kidneys, and heart. Exercise adds on top of this baseline, but for most non-athletes, voluntary activity accounts for only 20–30% of the daily total. The rest happens automatically.
TDEE (Total Daily Energy Expenditure) is the sum of all of it: the automatic baseline (BMR), the energy spent digesting food (thermic effect, roughly 10%), and deliberate movement. Your calorie target for any goal (maintaining weight, losing fat, or building muscle) is calculated by starting with TDEE and adjusting from there. A deficit of 500 kcal below TDEE loses approximately 0.45 kg per week; a surplus of 300–500 kcal above TDEE supports lean muscle gain.
The number is not a life sentence. TDEE changes as weight, age, and training volume change. A 10 kg fat loss alone reduces TDEE by 100–200 kcal, which is why plateaus happen and why recalculating every 6–8 weeks matters.
Enter your details above and the calculator returns your TDEE and goal-adjusted target in under 30 seconds.
Six Reasons Your Previous Calorie Target Was Wrong
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You used an activity multiplier that overstated your exercise volume. Most people who exercise 3 times per week describe themselves as "very active" but should select "moderately active" (multiplier 1.55). The difference on a 1,700 kcal BMR is 289 kcal per day — enough to prevent any fat loss despite a subjective feeling of eating at a deficit.
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You recalculated your TDEE only once and never updated it. TDEE falls as body weight drops. Losing 8 kg reduces BMR by approximately 80–100 kcal in a person who started at 80 kg. After 12 weeks of a successful fat loss phase, the original calorie target may be 150–200 kcal above the new maintenance level without any change in eating habits.
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You used the Harris-Benedict formula from 1919, which consistently overestimates BMR by 5%. The 1984 Roza-Shizgal revision corrected for this, and the 1990 Mifflin-St Jeor equation was validated more recently on a larger population. For a person with a true BMR of 1,700 kcal, the original Harris-Benedict formula produces approximately 1,785 kcal — enough to prevent a 500 kcal deficit from doing what it should.
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You have been sedentary for a sustained period and your muscle mass has declined. Muscle tissue burns roughly 13 kcal per kg per day; fat tissue burns roughly 4.5 kcal per kg per day. After 6 months of low activity and no resistance training, even a small shift in body composition (2 kg muscle replaced by 2 kg fat) reduces daily BMR by approximately 17 kcal. This compounds over years.
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Your calorie target was calculated for your goal weight, not your current weight. TDEE is based on the body you have now, not the body you want. A 90 kg person targeting 75 kg cannot eat at the 75 kg TDEE immediately, as that would create an excessive deficit. The correct approach is to calculate TDEE at current weight, apply a 500 kcal deficit, and recalculate every 5–8 kg of loss.
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You set the same calorie target year-round without accounting for training blocks. A competitive cyclist in base training (10 hours per week at low intensity) burns roughly 500–700 kcal less per day than during race-preparation blocks (14–16 hours per week at higher intensity). Using a single annual calorie target produces a surplus during base phase and a deficit during race phase, neither of which is intended.
BMR Equations and the Activity Multiplier: How the Numbers Are Built
Your BMR is an estimate of the calories your body burns at complete rest. Three validated equations exist, each suited to slightly different circumstances.
Mifflin-St Jeor (1990) — recommended default:
Male: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
Female: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161
Harris-Benedict (Roza & Shizgal 1984 revision):
Male: BMR = 88.362 + 13.397 × weight(kg) + 4.799 × height(cm) − 5.677 × age
Female: BMR = 447.593 + 9.247 × weight(kg) + 3.098 × height(cm) − 4.330 × age
Katch-McArdle — use when body fat % is known:
BMR = 370 + 21.6 × lean_mass(kg)
where lean_mass = weight × (1 − body_fat% / 100)
TDEE = BMR × activity_multiplier
Activity Multiplier Reference
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Desk job, little or no deliberate exercise | 1.200 |
| Lightly Active | Light exercise 1–3 days per week | 1.375 |
| Moderately Active | Moderate exercise 3–5 days per week | 1.550 |
| Very Active | Hard training 6–7 days per week | 1.725 |
| Extra Active | Physical job plus daily training | 1.900 |
Calorie Target Adjustment by Goal
| Goal | Daily Adjustment | Expected Weekly Change |
|---|---|---|
| Aggressive fat loss | TDEE minus 750 kcal | 0.7–0.8 kg loss |
| Moderate fat loss | TDEE minus 500 kcal | 0.45 kg loss |
| Slow fat loss | TDEE minus 250 kcal | 0.2–0.25 kg loss |
| Maintenance | TDEE | 0 |
| Lean muscle gain | TDEE plus 250–300 kcal | 0.1–0.2 kg gain |
| Faster muscle gain | TDEE plus 500 kcal | 0.25–0.35 kg gain |
Genetic variation matters here. Resting metabolic rate varies by up to 15% between individuals of identical age, sex, height, and weight. Part of this variance is explained by thyroid hormone levels, sympathetic nervous system activity, and mitochondrial efficiency differences that no equation captures. The Mifflin-St Jeor formula predicts BMR within 10% of measured values for roughly 80% of people, which makes it the most accurate general-purpose option but still an estimate. If your tracked results diverge consistently from the formula prediction after 3–4 weeks of accurate food logging, adjust the TDEE figure by 100–150 kcal in the relevant direction.
How to Use the Calculator in Six Steps
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Enter your sex, age, height, and weight. Use your current weight, not your goal weight. Height and weight can be entered in metric or imperial; do not mix units. Age should reflect your last birthday, not a rounded figure.
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Select your activity level honestly. If in doubt, choose one level lower than feels right. Research consistently shows that people overestimate both exercise frequency and intensity. The "moderately active" setting (1.55) fits most people who exercise 3–4 times per week for 45–60 minutes at genuine effort.
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Review your TDEE (maintenance calories). This is the number of calories your body burns daily at your current weight and activity level. Do not adjust diet based on this number alone. Identify your goal first.
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Select your goal: fat loss, maintenance, or muscle gain. The calculator applies the appropriate deficit or surplus. For fat loss, a 500 kcal daily deficit is the most evidence-supported rate. Do not reduce below 1,200 kcal (women) or 1,500 kcal (men) regardless of the calculated deficit.
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Note your adjusted daily calorie target. This is the number to hit, on average, across the week. Daily variation of 100–200 kcal above or below is normal and does not need to be corrected. Weekly average accuracy matters more than daily precision.
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Set a recalculation reminder for 6–8 weeks from today. As weight changes, TDEE changes. A reminder to re-enter your updated weight ensures the target stays accurate and prevents a maintenance plateau from being mistaken for a formula error.
Non-obvious insight: The Katch-McArdle formula (which uses lean mass instead of total weight) is more accurate than Mifflin-St Jeor for people at body fat extremes: very lean athletes and those with obesity. If you have a recent body fat percentage from a DEXA scan or reliable skinfold assessment, switching to Katch-McArdle removes the error introduced by treating fat tissue as metabolically equivalent to muscle tissue.
See the Calculation Run: Two Complete Examples
Example 1: Competitive Cyclist, Female, Age 29
Priya trains 5 days per week averaging 90 minutes per session. She is 165 cm tall and weighs 62 kg. Her goal is maintenance to support performance, not weight change.
BMR (Mifflin-St Jeor):
= 10 × 62 + 6.25 × 165 − 5 × 29 − 161
= 620 + 1031.25 − 145 − 161
= 1,345 kcal
TDEE:
Activity level: Very Active (1.725)
= 1,345 × 1.725 = 2,320 kcal
| Component | Value |
|---|---|
| BMR | 1,345 kcal |
| Activity multiplier | 1.725 (Very Active) |
| TDEE / maintenance target | 2,320 kcal |
Priya's maintenance target of 2,320 kcal is her starting point. As a cyclist, her actual expenditure varies significantly by day: a 90-minute threshold ride burns 700–900 kcal, while a rest day burns 300–400 kcal through deliberate exercise. Her actionable approach: target 2,320 kcal on average across the week rather than the same number daily, eating more on high-output days and slightly less on rest days to match actual expenditure.
Example 2: Office Worker Returning from Injury, Male, Age 44
Ben had knee surgery eight weeks ago and has been sedentary since. He is 178 cm, weighs 88 kg (up from 84 kg pre-injury), and wants to return to a 500 kcal daily deficit to lose the gained weight once cleared for light exercise.
BMR (Mifflin-St Jeor):
= 10 × 88 + 6.25 × 178 − 5 × 44 + 5
= 880 + 1112.5 − 220 + 5
= 1,777.5 kcal
TDEE (currently sedentary):
= 1,777.5 × 1.200 = 2,133 kcal
Fat loss target (500 kcal deficit):
= 2,133 − 500 = 1,633 kcal
| Component | Value |
|---|---|
| BMR | 1,778 kcal |
| Activity multiplier | 1.200 (Sedentary) |
| TDEE | 2,133 kcal |
| Fat loss target (−500 kcal) | 1,633 kcal |
Ben's 1,633 kcal target is above the male minimum floor of 1,500 kcal, so the 500 kcal deficit is safe to apply immediately. His actionable plan: hold 1,633 kcal while sedentary, then recalculate using the "Lightly Active" multiplier (1.375) once his physiotherapist clears him for walking and stationary cycling. That upgrade will raise his TDEE to approximately 2,444 kcal and his fat loss target to 1,944 kcal, allowing faster progress without any change in eating behaviour.
Five Calorie Counting Mistakes That Stall Progress
Using volume measurements instead of weight for calorie-dense foods. One tablespoon of peanut butter weighs 16 g when level and 24 g when heaped, a 50% difference in calories (95 kcal vs 143 kcal). Over a week, two daily tablespoons measured by volume rather than weight introduces a 672 kcal discrepancy. Use a kitchen scale for any food above 100 kcal per serving.
Logging exercise calories burned and then eating them back. Fitness tracker calorie burn estimates for exercise run 20–40% too high on average. Eating back all 400 "burned" calories from a tracked workout when the actual burn was 250 kcal eliminates the calorie deficit entirely. The safest approach: do not eat back exercise calories at all, and let the TDEE activity multiplier account for training volume at a population-average level.
Choosing the sedentary multiplier while doing a physical job. A warehouse worker, nurse, or construction worker who selects "sedentary" because they do not formally exercise is severely underestimating their TDEE. Standing and walking occupationally burns 300–600 extra kcal per day compared to desk work. These occupations fit "very active" or "extra active" depending on intensity, not "sedentary." Using the wrong multiplier creates a 500–700 kcal daily error before a single bite of food is logged.
Setting a calorie target based on an online macro calculator without accounting for the calorie total. Many macro calculators distribute protein, carbohydrate, and fat percentages without displaying the total calorie sum. A 30/40/30 protein/carb/fat split at 180 g protein means nothing if the total calorie budget is not defined. Always confirm the calorie total first, then set macros within it.
Not adjusting for a weight loss plateau after 4–6 weeks. A plateau lasting 10–14 days usually reflects water retention or meal timing rather than a true adaptation. A plateau lasting 3–4 weeks at accurate calorie tracking is an adaptation signal. The correct response is a 100–150 kcal reduction or a 10–15% increase in weekly training volume, not a dramatic cut. Cutting by 500 kcal on top of an existing deficit frequently crosses below the minimum floor and triggers muscle loss alongside fat loss.
Re-entering weight only when it drops, not on a fixed schedule. People who only update their calculator when they see a loss tend to skip updates during plateaus. But a 5 kg reduction in body weight reduces TDEE by 50–100 kcal, and failing to reflect this means the effective deficit shrinks invisibly over time. Fix: set a calendar reminder to re-enter weight every 4 weeks regardless of whether the number has moved.
Assumptions and Notes
- Margin of error: The Mifflin-St Jeor formula predicts measured BMR within 10% for roughly 80% of the population. For the remaining 20%, particularly those with thyroid conditions, significant obesity, or very high muscle mass, the estimate may diverge by 10–20%. If consistent food logging at the calculated target produces no expected change after 3–4 weeks, adjust the TDEE figure by 100–150 kcal in the direction the results suggest.
- Professional disclaimer: The calorie and TDEE estimates from this calculator are based on validated population equations and are intended as a planning guide. They do not constitute dietary or medical advice. People with eating disorder history, metabolic conditions, or specific medical dietary requirements should work with a registered dietitian before applying any calorie target.
After You Get Your Number
Ben's example shows the clearest use of the result: a 1,633 kcal sedentary target now, a planned upgrade to 1,944 kcal once cleared for exercise, and a recalculation date already in the diary. The number is not the goal. The goal is what you do in the 6–8 weeks between now and the next recalculation. Track your food accurately, hit the weekly average, and update the figure when your weight changes.
The formula takes two minutes. The hard part is the consistent logging.
Enter your details above and find your daily calorie target now.