Decision tools built for clarity
BMR Calculator
Estimate resting daily energy needs for educational use.
Choose units and sex, then enter age, weight, and height.
This Mifflin–St Jeor BMR estimate is educational, not a diagnosis or treatment target, and does not replace professional assessment.
Methodology
Formula or transformation
Applies the Mifflin-St Jeor resting-energy equation after normalizing the submitted measurements.
Variables
- Weight normalized to kilograms
- Height normalized to centimeters
- Age in completed years
- Formula sex constant
- Estimated resting energy
Units
- Kilogram
- Centimeter
- Year
- Kilocalories per day
Rounding policy
The estimated daily resting energy is rounded to the declared result scale using half away from zero.
The Mifflin–St Jeor equation estimates resting daily energy expenditure from sex, age, weight, and height.
Estimate resting daily energy needs for educational use.
Reviewed sources
Formula review history
-
Initial formula and source review.
Reviewed 2026-09-04 for formula version mifflin-st-jeor-v1
Assumptions
- Age, height, weight, and sex inputs match the equation variables.
- The estimate represents resting energy rather than total daily activity needs.
Limitations
- Mifflin–St Jeor predicts a population estimate and individual metabolic needs can differ.
- Pregnancy, growth, illness, medication, and body composition can make the estimate unsuitable.
Worked example
For a 30-year-old male at 70 kg and 175 cm, Mifflin–St Jeor estimates 10×70 + 6.25×175 − 5×30 + 5 = 1,648.75 kcal/day.
Frequently asked questions
Is BMR the same as daily calorie need?
No. BMR estimates resting energy before activity and other adjustments.
Is this a measured metabolic rate?
No. Measurement requires appropriate clinical equipment and conditions.