BMR Calculator

Estimate basal metabolic rate (BMR) with the Mifflin-St Jeor equation. BMR is energy used at rest, shown in kcal/day; it is an educational estimate, not a nutrition prescription or diagnosis. Calculate it clearly with Figur.

How the bmr calculator works

Estimate basal metabolic rate (BMR) with the Mifflin-St Jeor equation. BMR is energy used at rest, shown in kcal/day; it is an educational estimate, not a nutrition prescription or diagnosis.

Method and assumptions

Figur converts weight to kg and height to cm and applies Mifflin-St Jeor: 10×kg + 6.25×cm − 5×age + 5 for men or −161 for women, estimating resting kcal/day.

  • It applies only within the adult range and measurements accepted by the calculator.
  • The estimate does not incorporate activity, digestion, body composition, illness, medicines, pregnancy, or individual goals.
  • The result is rounded to the nearest kcal/day and may differ from clinically measured expenditure.

Educational information, not medical advice or a diagnosis. Consult a qualified health professional for care, symptoms, fertility, pregnancy, or nutrition needs.

Sources and references

Worked example

A 35-year-old man is 173 cm and 73 kg.

Mifflin-St Jeor estimates a BMR of 1,641 kcal/day.

Frequently asked questions

What is BMR?

BMR estimates the energy your body uses at rest before activity and digestion. Individual needs vary.

Can I use this for a medical diet?

No. Pregnancy, illness, medicines, body composition, and goals may need individualized advice from a qualified clinician or dietitian.

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