Basal Metabolic Rate (BMR)

Basal Metabolic Rate (BMR) Calculator

Use this free BMR calculator to estimate your basal metabolic rate in kcal/day from age, sex, height, and weight. You can enter height and weight in metric or imperial (feet/inches and either pounds or stones + pounds). It also estimates your daily calories (TDEE) for common activity levels: sedentary, lightly active, moderately active, very active, and extra active.

Sex
Male Female

Age (years)

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Units: Metric (cm, kg) Imperial (ft/in, st/lb or lb)

Height (cm)

Weight (kg)

Height

Weight

Stones + lb Pounds

Results

BMR: kcal/day

Activity level	Estimated calories (kcal/day)
Sedentary (little or no exercise)
Lightly active (light exercise 1–3 days/week)
Moderately active (moderate exercise 3–5 days/week)
Very active (hard exercise 6–7 days/week)
Extra active (very hard exercise / physical job)

How the calculation was done

Note: this estimate uses the Mifflin–St Jeor equation (a common BMR formula). Your true needs can vary with body composition, health, and measurement error.

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What is BMR and why it matters?

Basal Metabolic Rate (BMR) is the estimated number of calories your body uses per day at rest to keep you alive—breathing, circulation, temperature control, and basic organ function. People often use a BMR calculator as a starting point for weight management, meal planning, and fitness goals.

To estimate your everyday calorie needs, you can multiply BMR by an activity factor to get Total Daily Energy Expenditure (TDEE). This page calculates TDEE for sedentary through extra active lifestyles, producing a practical daily calorie estimate in kcal/day.