Nutrition
How to Calculate TDEE (Total Daily Energy Expenditure)
How to calculate TDEE using BMR and activity multipliers. A worked example and how to use the result for weight loss and maintenance.
TDEE stands for total daily energy expenditure: the number of calories you burn in a full day, including sleep, work, digestion, workouts and everything in between. Eat at your TDEE and your weight stays about the same. Eat below it and you lose weight. Eat above it and you gain.
This guide explains what TDEE is made of, how to calculate it step by step, how to choose the right activity level (the step most people get wrong), and how to correct the estimate with your own data. The TDEE calculator runs the same calculation instantly and shows your TDEE at every activity level.
What makes up your TDEE
| Component | What it is | Typical share |
|---|---|---|
| Basal metabolic rate (BMR) | Energy used at complete rest | 60–70% |
| Thermic effect of food (TEF) | Energy used to digest and store food | about 10% |
| Exercise activity | Planned workouts and sport | 0–15% for most people |
| Non-exercise activity (NEAT) | Walking, standing, chores, fidgeting | 15–30%, varies widely |
Two things stand out. First, BMR is the biggest part, which is why the calculation starts there. Second, non-exercise activity often matters more than workouts. Research on non-exercise activity thermogenesis (NEAT) found that it can differ by hundreds of calories a day between people of similar size. A person with an active job and 12,000 steps a day can burn more than someone who trains hard for an hour and then sits for the rest of the day.
The TDEE formula
TDEE = BMR × activity multiplier
Step 1: Calculate BMR. Use the Mifflin-St Jeor equation, which a systematic review found to be the most reliable common equation for healthy adults:
- Men: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
- Women: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
How to calculate BMR has worked examples in metric and imperial units.
Step 2: Multiply by your activity level. These are the same five levels the calculator uses. The multipliers already include the thermic effect of food, so don't add it again.
| Activity level | Multiplier | Typical week |
|---|---|---|
| Sedentary | 1.2 | Desk job, under about 5,000 steps a day, no workouts |
| Light | 1.375 | 1–3 light workouts a week, or 5,000–7,500 steps a day |
| Moderate | 1.55 | 3–5 moderate workouts a week, or 7,500–10,000 steps a day |
| Active | 1.725 | 6–7 hard workouts a week, or over 10,000 steps plus training |
| Very active | 1.9 | Physical job plus daily training, or endurance athlete |
The step ranges follow widely used pedometer categories for adults. They are a guide, not a strict rule.
Worked example
A 35-year-old woman, 165 cm, 75 kg, with a desk job, who walks about 6,000 steps a day and does two gym sessions a week:
- BMR = (10 × 75) + (6.25 × 165) − (5 × 35) − 161 = 1,445 kcal
- Activity: light (1.375)
- TDEE = 1,445 × 1.375 = 1,987 kcal a day
Here is how much the activity level changes the result for her and for a 40-year-old man who is 180 cm and 90 kg (BMR 1,830):
| Activity level | Woman, 35, 165 cm, 75 kg | Man, 40, 180 cm, 90 kg |
|---|---|---|
| Sedentary (1.2) | 1,734 | 2,196 |
| Light (1.375) | 1,987 | 2,516 |
| Moderate (1.55) | 2,240 | 2,836 |
| Active (1.725) | 2,493 | 3,157 |
| Very active (1.9) | 2,746 | 3,477 |
A single step up in activity level adds 250–320 kcal to their TDEE. That is more than the gap between any two BMR equations, and it is why choosing your activity level honestly matters more than which formula you use.
How to choose your activity level
Most people overestimate. A few rules help:
- Judge the whole week, not your best day. Three workouts a week with an otherwise sedentary job is usually "light", not "moderate".
- Use your step count if you have one. A phone or watch average over two weeks is more reliable than a guess.
- When in doubt, pick the lower level. Your weight trend will tell you within a few weeks if you should move up.
- Don't count workouts twice. If your activity level already includes your training, don't also add the calories your watch reports for workouts.
Using your TDEE
| Goal | Daily calories | Example (TDEE 1,987 kcal) |
|---|---|---|
| Lose fat steadily | TDEE − 10–25% | about 1,500–1,790 kcal |
| Maintain weight | TDEE | about 1,990 kcal |
| Build muscle with little fat gain | TDEE + 5–10% | about 2,090–2,190 kcal |
For weight loss, a deficit of 10–25% (for most people about 250–550 kcal a day) is sustainable. How many calories to eat to lose weight shows how to pick a pace, and the calorie deficit guide covers what happens once you start. For muscle gain, a small surplus with enough protein and progressive strength training limits fat gain.
Calculate your real TDEE from your own data
Every formula estimates the average person with your stats. Individuals vary, and most people's measured resting burn falls within about 10% of the prediction. The most accurate TDEE is the one you calculate from your own intake and weight:
- Log everything you eat and drink for 2–4 weeks, as accurately as you can.
- Weigh yourself at least three to four times a week under the same conditions, and track the average.
- Calculate: real TDEE ≈ average daily intake + (weight lost in kg × 7,700 ÷ number of days). If you gained weight, subtract instead.
Example: you ate an average of 2,000 kcal a day for 21 days and your average weight fell by 0.9 kg. 0.9 × 7,700 ÷ 21 = 330. Your real TDEE is about 2,000 + 330 = 2,330 kcal a day.
This method uses the approximation of 7,700 kcal per kilogram of body fat, which works well over a few weeks. Longer term, energy needs fall as weight drops, as NIH modelling of weight change shows. So repeat the check every month or two while you're losing weight.
Why your TDEE changes
- Weight change. A smaller body burns less, both at rest and when moving.
- Age. A large study of energy expenditure across the lifespan found that it stays fairly stable from 20 to 60 once body size is taken into account, then declines. Keeping your muscle helps.
- Daily movement. NEAT falls without you noticing when you're tired, busy or dieting. Watching your step count is one of the easiest ways to keep TDEE up during a diet.
- Muscle mass. More fat-free mass raises BMR, and strength training helps you keep it.
Common mistakes
- Using your goal weight instead of your current weight. This underestimates TDEE and creates a much bigger deficit than intended.
- Counting workouts twice, in the activity multiplier and again from a watch.
- Trusting watch calorie readings uncritically. Wearables often overestimate calories burned during exercise.
- Changing course after one weigh-in. Water swings can hide fat loss for a week or two. Use three-week trends.
FAQ
Is TDEE the same as maintenance calories?
Yes. Maintenance calories is simply another name for TDEE: the intake at which your weight stays stable.
Should I eat at my TDEE on rest days?
Your TDEE is an average across the week, so the same target works every day. If you prefer, eat a little more on training days and a little less on rest days, as long as the weekly total is the same.
How often should I recalculate my TDEE?
After every 4–5 kg (about 10 lb) of weight change, when your activity changes significantly (a new job, a new training plan), or when your weight trend stops matching your target for three weeks or more.
Why is my calculated TDEE different from my watch's number?
They estimate different things in different ways. Formulas estimate a typical person with your stats. Watches add heart rate and movement data but often overestimate exercise calories. Your weight trend is the tiebreaker.
Sources
- Mifflin MD, St Jeor ST, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990.
- Frankenfield D, Roth-Yousey L, Compher C. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review. J Am Diet Assoc. 2005.
- Westerterp KR. Diet induced thermogenesis. Nutr Metab. 2004.
- Levine JA. Non-exercise activity thermogenesis (NEAT). Best Pract Res Clin Endocrinol Metab. 2002.
- Tudor-Locke C, Bassett DR. How many steps/day are enough? Preliminary pedometer indices for public health. Sports Med. 2004.
- Hall KD, et al. Quantification of the effect of energy imbalance on bodyweight. Lancet. 2011.
- Pontzer H, et al. Daily energy expenditure through the human life course. Science. 2021.