Estimate your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest — using the Mifflin-St Jeor equation. Enter sex, age, weight and height in metric or imperial.
Choose your unit system, then enter your sex, age, weight and height. The Mifflin-St Jeor equation estimates the energy your body uses at rest, plus a sedentary daily total.
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Your Basal Metabolic Rate (BMR) is the energy your body uses just to stay alive — breathing, circulation, cell production — at complete rest. It's the baseline onto which activity is added to find your total daily needs.
Multiply BMR by an activity factor for total daily energy expenditure (TDEE); 1.2 represents a sedentary day.
It's among the most accurate for the general population without body-composition data. Katch-McArdle is more precise if you know your lean body mass, as it uses fat-free mass.
Most people underestimate body fat and overestimate muscle. BMR is driven mostly by lean mass; crash dieting can also temporarily suppress it. The figure is an estimate, not an exact measurement.