Which formula is used?

Mifflin–St Jeor for BMR, multiplied by an activity factor for TDEE.

How accurate is TDEE?

Individual metabolism varies ±several hundred kcal; treat as a starting estimate.

Use it as a center point; track trends over weeks and adjust based on real weight change.

Special populations need tailored advice—this is a general adult calculator.

We use Mifflin–St Jeor here; body-fat–based models differ if you know lean mass precisely.

No. Calculations run locally in your browser.

Estimate Basal Metabolic Rate (BMR) and daily energy needs (TDEE) using Mifflin–St Jeor.

Age (years)Height (cm)Weight (kg)

Activity level

Estimated BMR

-- kcal/day

Estimated TDEE

-- kcal/day

Informational only; verify critical results independently.

Enter biological sex (used in the Mifflin–St Jeor equation), age, weight, and height.
Choose the activity level that best matches most weeks—not your busiest day only.
Read BMR (resting needs) and TDEE (total daily energy with activity).
Adjust activity up or down if your job is sedentary but you train hard, or vice versa.
Use TDEE as a maintenance starting point; deficits and surpluses are personal goals with professional guidance.
Re-run when weight or activity level changes materially.

Which formula is used?: Mifflin–St Jeor for BMR, multiplied by an activity factor for TDEE.
How accurate is TDEE?: Individual metabolism varies ±several hundred kcal; treat as a starting estimate.
Should I eat exactly TDEE to maintain weight?: Use it as a center point; track trends over weeks and adjust based on real weight change.
Athletes and pregnancy?: Special populations need tailored advice—this is a general adult calculator.
Katch–McArdle vs Mifflin?: We use Mifflin–St Jeor here; body-fat–based models differ if you know lean mass precisely.
Is health data stored?: No. Calculations run locally in your browser.

Last updated: 2025-09-15