Calorie Calculator (TDEE)

What Is TDEE and Why It's the Foundation of Any Diet

Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a day, combining the energy needed to keep you alive at rest with the energy you burn through movement, exercise, and digestion. TDEE is the single most important number in nutrition planning because every calorie goal — losing fat, maintaining weight, or building muscle — is defined relative to it. Eat below your TDEE consistently and you lose weight; eat above it and you gain; eat at it and your weight holds steady, at least in principle.

How This Calculator Estimates Your TDEE

The calculation happens in two steps. First, the tool estimates your Basal Metabolic Rate (BMR) — the calories you'd burn lying in bed all day — using the Mifflin-St Jeor equation, which nutrition researchers consider the most accurate widely available formula for the general population, outperforming the older Harris-Benedict equation in modern validation studies. Second, your BMR is multiplied by an activity factor ranging from 1.2 for a sedentary lifestyle to 1.9 for extremely active individuals, which scales your resting number up to reflect how much you actually move throughout the day.

Choosing the Right Activity Level

Most people overestimate their activity level, so it's worth being honest here. Sedentary means a desk job with little or no structured exercise. Light activity covers casual exercise one to three days a week. Moderate activity fits three to five structured workouts weekly. Very active suits people training hard six to seven days a week, and extremely active is reserved for those combining daily intense training with a physically demanding job — a category that fits fewer people than you'd think. Choosing one level too high is the most common reason people don't lose weight despite "eating at their TDEE."

Using Your Result To Set a Calorie Target

This calculator shows your maintenance number alongside four common adjustment targets. A 500-calorie daily deficit is the traditional target for roughly half a kilogram of fat loss per week, since one kilogram of fat corresponds to about 7,700 calories. A smaller 250-calorie deficit gives a gentler, more sustainable pace that's often easier to maintain long-term and preserves more muscle mass. On the gaining side, a 250-calorie surplus supports a lean muscle-building phase with minimal fat gain, while a 500-calorie surplus suits people prioritizing faster size and strength gains who are willing to accept a bit more fat gain along the way.

Refining Your Numbers Over Time

Formulas give you an excellent starting point, but your real-world TDEE can only be confirmed by tracking your actual weight change against your actual intake over two to three weeks. If your weight isn't moving the way the math predicts, adjust your calorie target by 100-150 calories and reassess rather than assuming the formula is broken. For a full picture, pair this with our BMR Calculator and Macro Nutrient Calculator to translate your calorie target into a specific eating plan.

Frequently Asked Questions