How to use this calculator
- Enter or choose sex.
- Enter or choose age.
- Enter or choose units.
- The bMR updates as you type. Use Copy result or Share to keep it.
Formula
BMR = 10 × W + 6.25 × H − 5 × A + s (s = +5 for men, −161 for women)
- W
- weight in kg
- H
- height in cm
- A
- age in years
- s
- +5 (male) or −161 (female)
Worked example
- 10 × 60 = 600; 6.25 × 165 = 1,031.25; 5 × 25 = 125.
- BMR = 600 + 1,031.25 − 125 − 161 = 1,345.25.
- Moderately active: 1,345 × 1.55 ≈ 2,085 kcal a day.
A 25-year-old woman, 165 cm and 60 kg, has an estimated BMR of about 1,345 kcal a day.
What the result means
The activity table estimates total daily energy expenditure. These are population averages: individual metabolism can differ by 10% or more.
Assumptions and limits
- Mifflin–St Jeor equation (1990), generally considered the most accurate of the common BMR equations for healthy adults.
- Standard activity multipliers of 1.2 to 1.9.
- Adults only.
- Less accurate for very muscular people, older adults and people with medical conditions that affect metabolism.
Questions
What is the difference between BMR and TDEE?
BMR is energy used at rest. TDEE (total daily energy expenditure) adds movement and exercise; it is BMR multiplied by an activity factor.
Which activity level should I choose?
Most people with desk jobs who exercise a few times a week fall between “lightly” and “moderately active”. If unsure, choose the lower level.
Sources
Please note: This is a general screening estimate for adults, not medical advice or a diagnosis. Talk to a qualified health professional about your health.