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Free food and nutrition calculators

From calories to portions: practical tools with transparent formulas, linked sources and explained results. Calculations run in your browser.

01 / kcal

Free daily calorie needs calculator

How many calories do you need per day? Estimate resting metabolism and total daily energy expenditure from age, weight, height and activity.

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EFSA protein reference calculator

Calculate what the population reference of 0.83 g of protein per kg per day means for healthy adults.

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Calories from macros: 4–4–9 calculator

Convert grams of protein, available carbohydrate and fat into energy and compare their percentage contributions.

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Nutrition per portion calculator

Convert nutrition label values per 100 g into calories and macronutrients for your chosen amount.

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Research tools and official resources

Scientific models and reference values are useful when their assumptions are understood. These external resources are not developed by Nutryfit.

NIDDK Body Weight Planner ↗

A dynamic model of body weight over time, developed by NIDDK. For adults, with eligibility limits and instructions on the official site.

EFSA DRV Finder ↗

Nutrient reference values for population groups. These are not personal supplement doses.

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