Work out calories in food portion instantly with clear inputs, formula shown and shareable results.
Scales the per-100-gram energy figure on the label to the portion actually eaten and expresses it against a daily target.
Portion energy
Portion calories = calories per 100 g x portion grams / 100
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
It allows direct comparison between products regardless of pack size, which per-serving figures obscure.
They are averages with legal tolerances of up to 20%, and cooking changes them further.