Nutrition Calculators

Free tools that run directly in your browser, no sign-up and no tracking. Each tool explains in plain language what your result means and what sensible next steps look like.

BMI Calculator Check your body mass index instantly: with WHO classification, age table and waist-to-height check. BMI Calculator for Children Percentiles based on the Kromeyer-Hauschild reference data, the method used in pediatric practice (ages 2 to 18). Calorie Calculator Basal metabolic rate and total daily energy needs with Mifflin-St Jeor: how many calories you need per day. Calories Burned Calculator What sports and everyday activities burn: 17 activities with MET values from the Compendium of Physical Activities. Macro Calculator Carbs, fat and protein in grams: based on established reference values or common macro splits. BMR Calculator Your calorie burn at rest: Mifflin-St Jeor as the main result, Harris-Benedict and Katch-McArdle for comparison. Calorie Deficit Calculator Your target range for losing weight: a moderate deficit of 300 to 500 kcal with a realistic assessment. Body Fat Calculator Body fat percentage with a tape measure using the US Navy method, with measuring guide and classification table. Sugar Intake Calculator How much free sugar per day is okay: your limit based on the WHO recommendation, in grams and sugar cubes. Ideal Weight Calculator Shows you a healthy weight range: BMI range, Broca and Devine in comparison. Protein Calculator Your daily protein needs based on established reference values, adjusted for age and training. Water Intake Calculator How much you should drink per day: based on EFSA reference values, with adjustments for exercise and heat. Caffeine Calculator Your daily limit based on the EFSA assessment, with a caffeine counter for coffee, tea, cola and energy drinks.

How to read your result

Each of these tools uses recognized scientific formulas and cites its sources. Still, every result remains an estimate, because no formula can capture your metabolism and your daily life exactly. If you want to act on the numbers, our nutrition basics give you the background knowledge, and the coach directory helps you find qualified support near you or online.

Frequently asked questions about the calculators

Are the calculators really free?

Yes, all calculators are free to use, with no sign-up and no tracking. The calculations run directly in your browser, none of your inputs are sent to us.

Which calculator should I use for what?

For assessing your weight, use the BMI calculator (for children, use the dedicated children's BMI calculator with percentiles). For planning your nutrition, most people start with the calorie calculator, for weight loss the calorie deficit calculator adds a target range and the macro calculator splits your calories into carbs, fat and protein. The calories burned, protein, water intake, sugar and caffeine calculators answer the most common detail questions.

How reliable are the results?

All tools use recognized formulas and reference values from the WHO, EFSA and the scientific literature, and they cite their sources. Still, every result remains an estimate, because no formula can capture your metabolism and your daily life exactly. Take the results as a starting point, not a verdict.

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