How to calculate bmr
Calculators online guesstimate or you can get it tested
If we want to get really technical, the tests and calculators are actually determining a resting (RMR) vs. basal metabolic rate (BMR). It's very, very difficult to get an accurate BMR and typically this is only done in laboratory settings.
The RMR is close to the BMR, so we use it for all intents and purposes.
Susan Macfarlane, MScA, RD
Registered Dietitian Nutritionist
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There are several formulas used to estimate BMR. Chronometer implements the Mifflin St Jeor equation.