How this calculator works
Mifflin-St Jeor predicts resting energy from adult age, sex, mass and height. Cunningham predicts it from fat-free mass, which must be supplied as a measurement or estimate. RMR measurement is performed under resting conditions that differ from strict basal protocols. Neither model includes a whole day of activity. Reverse modes recover the measurement implied by a chosen RMR; they do not replace measurement. The result is an estimate for information only and is not medical advice.
Formula
Mifflin-St Jeor: RMR = 10W + 6.25H - 5A + s, where s = 5 for males and -161 for females. Cunningham (1980): RMR = 500 + 22 x fat-free mass in kg.
Worked example
A 30-year-old man at 80 kg and 180 cm has Mifflin RMR 1780 kcal/day. Cunningham with 60 kg fat-free mass gives 1820 kcal/day.
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Frequently asked questions
Why are the model results different?
They use different predictors and were fitted to different datasets.
Is RMR my maintenance intake?
No. Maintenance includes activity and digestion as well as rest.
Is a measured RMR more useful?
Indirect calorimetry can reduce equation error when performed and interpreted correctly.