BMR Calculator: Estimate Basal Metabolic Rate

BMR Calculator (Basal Metabolic Rate)

Use our free BMR Calculator to find out how many calories your body burns at rest.

Gender

Age (15 – 80)

Weight (kg)

Height (cm)

Mifflin-St Jeor (Standard)

Most accurate modern clinical standard

0 kcal/day

Used as the benchmark baseline for diet and sports physiology programs.

Revised Harris-Benedict

1984 Roza & Shizgal formula

0 kcal/day

Traditional metabolic formula, historically cited in clinical nutrition research.

What is Basal Metabolic Rate (BMR)?

BMR represents the baseline calories burned in 24 hours at complete rest to keep organs functioning (breathing, circulating blood, cell synthesis). It does not include physical activity or food digestion.

Daily Maintenance Needs (TDEE from BMR)

Calculated by multiplying your Mifflin-St Jeor BMR by standard physical activity factors:

Sedentary Desk job, little to no exercise (x1.2)

0 kcal

Lightly Active Light exercise or sports 1–3 days/week (x1.375)

0 kcal

Moderately Active Moderate exercise or sports 3–5 days/week (x1.55)

0 kcal

Very Active Hard exercise or training 6–7 days/week (x1.725)

0 kcal

Extra Active Physical labor job or 2x/day athletic training (x1.9)

0 kcal

Why BMR Matters

BMR represents the minimum number of calories required to keep your body functioning at rest.