Advanced BMR Calculator

BMR is the energy your body needs at rest in a neutral temperature after ~12 hours fasting.

Your Resting Energy

Live BMR with multiple formulas and a quick TDEE preview.

Units

Sex

“Other” will show a range for sexed formulas.

Age

Required for all formulas.

Body Fat % (optional)

Enables Katch–McArdle (LBM-based).

Height cm or ft/in

We auto-convert when you toggle units.

Weight kg or lbs

Use your usual morning weight if possible.

Formula

Mifflin–St Jeor (recommended) Harris–Benedict (revised) Katch–McArdle (LBM)

Estimates vary by individual. This is resting energy only. For medical/diet decisions, consult a professional.

Awaiting inputs

BMR: —

This is resting energy only. Activity increases total daily needs.

BMR gauge0–3000 kcal

Mifflin–St Jeor—

Harris–Benedict—

Katch–McArdle (if BF% provided)—

Katch–McArdle uses your Lean Body Mass (requires Body Fat %).

Estimated Total Daily Energy Expenditure = BMR × activity factor.

Sedentary (1.2)—

Light (1.375)—

Moderate (1.55)—

Very Active (1.725)—

Extra Active (1.9)—