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.
Common searches this calculator answers include “mifflin st jeor calculator”, “mifflin st jeor equation for bmr”, “mifflin st jeor bmr formula”, “how many calories do i burn at rest”, “daily calories”.
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.
Tips for accurate results
- Enter weight in kilograms and height in centimetres; the equation does not use pounds or inches.
- Choose the activity level that matches your typical week, not your best week.
- Treat the result as an estimate; individual metabolic rates can differ by about 10%.
Common mistakes
- Using pounds or inches, which gives a badly wrong BMR.
- Choosing a high activity factor for a mostly sedentary week, which overstates calorie needs.
- Using the result as a precise target for medical or weight-loss decisions without professional advice.
Frequently asked questions
What is the bmr calculator used for?
Estimate basal metabolic rate and daily calorie needs. It helps with questions such as “mifflin st jeor calculator”, “mifflin st jeor equation for bmr”, “mifflin st jeor bmr formula”.
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 equation) 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 the bmr 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 bmr 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.