TDEE Calculator — Total Daily Energy Expenditure Explained in Depth

Your TDEE — Total Daily Energy Expenditure — is the total number of calories your body burns in a day, including everything: just being alive, digesting food, moving around, and intentional exercise. It's the number that determines whether you lose weight, gain weight, or maintain. Get this wrong and no diet or training plan will work as expected.

Calculate yours with the TDEE Calculator on CalcHub, then actually understand what drives it.

What Goes Into Your TDEE

TDEE has four main components:

Component	What It Is	% of Total TDEE
BMR (Basal Metabolic Rate)	Calories burned at complete rest — organs, breathing, thermoregulation	~60–70%
NEAT (Non-Exercise Activity Thermogenesis)	All movement that isn't formal exercise — walking, fidgeting, chores	~15–30%
EAT (Exercise Activity Thermogenesis)	Intentional exercise — gym, running, sports	~5–10%
TEF (Thermic Effect of Food)	Energy used to digest and process food (~10% of calories eaten)	~10%

The big surprise for most people: formal exercise is a relatively small share. NEAT — how much you move throughout the day outside the gym — has an enormous effect on total calorie burn.

The Formulas: Mifflin-St Jeor vs Harris-Benedict

Mifflin-St Jeor (recommended — more accurate for modern populations):

• Males: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
• Females: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161

Harris-Benedict (original 1919, revised 1984):

• Males: BMR = 88.362 + (13.397 × weight kg) + (4.799 × height cm) − (5.677 × age)
• Females: BMR = 447.593 + (9.247 × weight kg) + (3.098 × height cm) − (4.330 × age)

Mifflin-St Jeor consistently outperforms Harris-Benedict in validation studies and is the preferred formula in clinical nutrition. The difference is typically small (50–150 calories) but Mifflin is generally more accurate for overweight individuals.

Activity Multipliers

Once you have your BMR, multiply by the appropriate activity factor:

Activity Level	Description	Multiplier
Sedentary	Desk job, little to no exercise	× 1.2
Lightly active	Light exercise 1–3 days/week	× 1.375
Moderately active	Moderate exercise 3–5 days/week	× 1.55
Very active	Hard exercise 6–7 days/week	× 1.725
Extremely active	Physical job + hard daily exercise	× 1.9

The common mistake: Overestimating your activity level. Someone who goes to the gym 3x/week but sits at a desk all day is "lightly active," not "moderately active." The sedentary hours matter.

Example Calculation

35-year-old female, 165 cm, 65 kg, moderately active (gym 4x/week, desk job):

BMR (Mifflin): (10 × 65) + (6.25 × 165) − (5 × 35) − 161
= 650 + 1031.25 − 175 − 161 = 1345 calories

TDEE: 1345 × 1.55 = ~2085 calories/day

Setting Calorie Targets Based on TDEE

Goal	Calorie Target	Expected Rate
Aggressive fat loss	TDEE − 20–25%	~1 kg/week (high muscle risk)
Moderate fat loss	TDEE − 500	~0.5 kg/week (recommended)
Slow fat loss	TDEE − 250	~0.25 kg/week (easier to maintain)
Maintenance	= TDEE	No change
Lean bulk	TDEE + 200–300	Minimal fat gain
Aggressive bulk	TDEE + 500+	Fast gain, more fat accumulation

Why Your TDEE Changes Over Time

Several factors cause TDEE to shift during a diet or training program:

Adaptive thermogenesis — When you eat less for extended periods, your body becomes more metabolically efficient. TDEE drops beyond what weight loss alone would predict. This is why "eat less, move more" plateaus and why recalculating TDEE every 4–6 weeks during a cut is important. NEAT reduction — Unconsciously, people move less when underfed. Fidgeting decreases, you take elevators, you sit more. This can reduce TDEE by 100–300+ calories without noticing. Muscle mass changes — Muscle is more metabolically active than fat. Adding muscle raises BMR; losing muscle lowers it.

How accurate is TDEE estimation?

Population-level equations have significant individual variation — prediction errors of ±10–15% are common. Use your calculated TDEE as a starting point, track your weight for 2–3 weeks, and adjust based on actual results. Real data from your body beats any formula.

Why am I not losing weight at a 500-calorie deficit?

A few possibilities: calorie tracking errors (most people undercount food by 20–40%), NEAT reduction compensating for the deficit, water retention masking fat loss short-term, or your actual TDEE being lower than estimated. Weigh yourself daily and use the weekly average to see true trends.

Should I eat back exercise calories?

If you used the activity multiplier that already includes your exercise, no. If you used the sedentary or lightly active multiplier and exercise is on top of that, adding back a portion (50–75%) of exercise calories is reasonable. Using fitness tracker exercise calorie estimates is often unreliable — they typically overstate by 30–50%.

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• Protein Intake Calculator — Daily protein target
• BMI Calculator — Body mass index