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How many calories do you need per day? Estimate resting metabolism and total daily energy expenditure from age, weight, height and activity.
Fill in the fields to get an estimate. Resting metabolism is only part of the energy you use throughout the day.
Your daily estimate
kcal/day
A starting estimate, not a mandatory target. Actual needs can differ: activity, body composition, health and other factors are not measured here.
Mifflin–St Jeor
We use Mifflin–St Jeor for resting energy expenditure: 10 × kg + 6.25 × cm − 5 × years, then +5 or −161. The unrounded result is multiplied by your selected activity factor. These are the same equation and factors used in Nutryfit onboarding.
Factors: 1.2 · 1.375 · 1.55 · 1.725 · 1.9. They are approximate product categories, not measurements of your movement or part of the original equation. Do not add exercise calories again.
Mifflin et al. (1990) — Resting energy expenditure, DOI: 10.1093/ajcn/51.2.241 ↗
This tool does not set a deficit, prescribe a diet or predict a weight-loss timeline. Do not use it for children, pregnancy or breastfeeding. Medical conditions, treatments, high muscle mass or older age may need a different approach. This is not NIDDK’s dynamic Body Weight Planner model.
General information for adults, not a personal diet or prescription. For medical conditions, pregnancy, breastfeeding, eating disorders or specific needs, consult a qualified professional.
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Calories measure energy, not the overall quality of a food. Separating resting metabolism from total daily needs helps you use a calculator without treating an estimate as a prescription.
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