What Is TDEE and How to Calculate It
If you have ever tried to lose or gain weight in a controlled way, you have probably been told to 'count your calories'. But the number that actually matters is how many calories your body burns in a day — your Total Daily Energy Expenditure, or TDEE. Get that figure right and everything else, from a weight-loss plan to a muscle-building diet, becomes far easier to design.
What TDEE means
TDEE is the total number of calories your body uses in a typical 24-hour period. It accounts for everything: keeping your organs running, digesting food, walking around, exercising, and even fidgeting. If you eat roughly your TDEE each day, your weight stays stable. Eat consistently below it and you lose weight; eat above it and you gain. It is the single most useful number in any nutrition plan.
It starts with your BMR
TDEE is built on top of your Basal Metabolic Rate (BMR) — the calories your body would burn at complete rest, just to stay alive. BMR alone typically accounts for 60–70% of the calories most people burn. A common way to estimate it is the Mifflin–St Jeor equation, which uses your weight, height, age and sex. Once you know your BMR, TDEE is simply your BMR multiplied by an activity factor.
The activity multipliers
To turn BMR into TDEE, multiply by a factor that reflects how active you are:
- Sedentary (little or no exercise): BMR × 1.2
- Lightly active (light exercise 1–3 days a week): BMR × 1.375
- Moderately active (moderate exercise 3–5 days a week): BMR × 1.55
- Very active (hard exercise 6–7 days a week): BMR × 1.725
- Extremely active (physical job or twice-daily training): BMR × 1.9
For example, if your BMR is 1,500 calories and you are moderately active, your TDEE is 1,500 × 1.55 = about 2,325 calories a day. That is roughly what you would eat to maintain your current weight.
Using TDEE for your goal
- To maintain weight, eat around your TDEE.
- To lose weight, eat a modest deficit — commonly 300–500 calories below TDEE for steady, sustainable loss.
- To gain weight or build muscle, eat a surplus — often 250–500 calories above TDEE, paired with strength training.
- Recalculate every few weeks, because as your weight changes, so does your BMR and therefore your TDEE.
Why it is an estimate, not a guarantee
TDEE formulas are based on population averages, so your true expenditure can differ by a few hundred calories either way. Treat the number as a sensible starting point: follow it for two to three weeks, track your weight trend, and adjust up or down based on what actually happens rather than what the formula predicted.
The bottom line
TDEE is your BMR scaled up by how active you are, and it tells you the calorie level that keeps your weight steady. From there, a small deficit or surplus moves you towards your goal. Calculate yours with our tool, use it as a starting point, and refine it based on real results over a few weeks.