Summary
Mifflin–St Jeor resting energy estimate in kcal/day for planning conversations, not metabolic testing.
Calculation details
The biological-sex field is an equation input. Metabolism varies among individuals, so the result is an estimate rather than a measured metabolic rate.
Formula
Male: 10W + 6.25H - 5A + 5. Female: 10W + 6.25H - 5A - 161.
Worked example
BMR worked example
The equation estimates resting kilocalories per day.
How it works
Enter age, the sex-specific equation constant, weight, and height. Mifflin–St Jeor estimates resting kilocalories only. Use the figure as a starting reference before activity adjustments.
Frequently asked questions
Is this a medical diagnosis?
No. It is an educational estimate and cannot diagnose a condition or replace individualized professional advice.
Why can my actual result differ?
Metabolism, illness, medications, and measurement error change resting energy needs.
When is this calculator most useful?
Use it to sketch a resting calorie baseline before applying activity multipliers.
How are results rounded?
The calculation retains full precision; centralized display formatting rounds only the visible result.