Calorie Calculator BMR & TDEE
Estimate adult BMR with the Mifflin–St Jeor equation, then apply the selected activity factor for an illustrative daily calorie/TDEE estimate.
About this tool
Calculates estimated resting energy expenditure with the adult Mifflin–St Jeor equation, then applies the selected activity multiplier. It also displays simple ±10% mathematical scenarios.
Adults seeking a general planning estimate. It is not designed for children, pregnancy, breastfeeding, eating-disorder care, illness or clinical nutrition planning.
All calculations happen in your browser. No data is transmitted or stored anywhere.
Mifflin-St Jeor equation used by this calculator
BMR is the resting-energy estimate before an activity multiplier is applied. The calculator uses the adult Mifflin-St Jeor equations with weight in kilograms, height in centimetres and age in years:
Male: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
Female: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161
The +5 term is the male coefficient and −161 is the female coefficient. The displayed activity-adjusted total is BMR × the selected activity factor. Those activity factors are broad assumptions rather than measured individual energy requirements.
Worked example
For a 35-year-old female at 65 kg and 165 cm, the equation gives 10 × 65 + 6.25 × 165 − 5 × 35 − 161 = 1,345.25 kcal. With the sedentary factor 1.2, the activity-adjusted estimate is 1,345.25 × 1.2 = 1,614.3 kcal. The interface rounds these displayed results to 1,345 kcal BMR and 1,614 kcal for the illustrative daily total.
Sources
Reviewed 23 June 2026: Mifflin et al.: original resting-energy equation; US NIDDK: Body Weight Planner; World Health Organization: healthy diet.