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BMR Calculator

Basal metabolic rate — estimated calories at rest from age, sex, height and weight — before activity is added.

Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.

Result

Fill in the form and click Calculate to see your result here.

How it's calculated

BMR from the Mifflin–St Jeor or equivalent equation implemented in the handler (kcal/day).

Example

Example: BMR Calculator

Inputs

  • Gender: male
  • Weight Kg: 70
  • Height Cm: 170
  • Age: 30
  • Activity Level: sedentary

Outputs

  • Bmr: 1617.5
  • Tdee: 1941

This example uses typical sample values. Adjust the inputs above to see how the results change for your own numbers.

About this calculator

BMR is the overnight-idle energy burn estimate. It is the foundation under TDEE, not the whole day’s food budget. This calculator applies a standard equation so you can see how age and body size move the floor.

Do not eat at BMR to “lose faster.” That is a rest estimate, not a diet. Use the calorie calculator when you want activity included.

Frequently Asked Questions

Men: BMR = 10×kg + 6.25×cm − 5×age + 5. Women: −161 instead of +5. Then TDEE = BMR × activity (1.2–1.9).
BMR is resting energy. TDEE estimates daily burn including activity. Eating at BMR long-term is not a self-serve protocol.
Not used here. Older HB equations give different kcal; do not mix papers.
True BMR is lab conditions. This is a population equation (±~10% error typical). Illness, thyroid, and muscle mass shift real values.
Same multiplier table (sedentary 1.2 through very active 1.9).
Pediatric energy equations differ. Not for toddlers.
Not offered (no body-fat field).
It is estimated expenditure. Goals (deficit/surplus) are on the calorie calculator’s goal control if present.
Weight kg, height cm, age years — as the paper specified.
Educational. Clinical nutrition uses measured RMR when decisions are high-stakes.

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