How to use the bmr calculator
Estimate basal metabolic rate and daily calorie needs. Enter weight, height, age, sex, activity level in the fields above; the bmr, daily calories (tdee) are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- w — Weight (kg)
- h — Height (cm)
- a — Age (years)
- s — Sex (—)
- act — Activity level (—)
Worked example
With weight = 70 kg, height = 175 cm, age = 30 years, sex = Male, activity level = Moderate, the calculator gives bmr ≈ 1,648.75 kcal/day; daily calories (tdee) ≈ 2,555.563 kcal/day.
Frequently asked questions
What is the formula for the bmr calculation?
BMR (kcal/day) = 10 × w+6.25 × h-5 × a+s. Daily calories (TDEE) (kcal/day) = [BMR] × act. Here w is weight (kg), h is height (cm), a is age (years), s is sex (—), act is activity level (—).
What inputs do I need for the bmr calculator (mifflin–st jeor) calculator?
You need weight in kg, height in cm, age in years, sex in —, activity level in —. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.