Work out resting metabolic rate instantly with clear inputs, formula shown and shareable results.
Converts measured oxygen consumption into energy expenditure by indirect calorimetry, using the caloric equivalent of oxygen for the measured respiratory quotient.
Indirect calorimetry
Energy (kcal/min) = VO2 (L/min) x caloric equivalent of oxygen, which runs from 4.686 kcal/L at RQ 0.707 to 5.047 kcal/L at RQ 1.00
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
It measures energy expenditure directly rather than estimating it from body size, so it captures individual variation.
Fat and carbohydrate release different energy per litre of oxygen, so the conversion factor shifts with substrate use.