FOODMANAC · NUTRITION TOOLS
Understand your numbers. Explore your food.
Thirteen free calculators with transparent formulas, reference links and downloadable results. For generally healthy adults aged 20–78. Results are estimates, not medical prescriptions.
Calorie Calculator
Estimate maintenance calories and explore a chosen calorie deficit or surplus using your age, height, weight and activity.
Open calculator →Protein Calculator
Calculate a daily protein range for general nutrition, fitness, muscle-building or fat-loss planning, then explore protein-containing foods.
Open calculator →Carb Calculator
Convert an energy budget into daily carbohydrate grams and compare the result with the general adult reference range.
Open calculator →Fat Intake Calculator
Estimate daily fat grams from calories and a chosen percentage within the general adult fat reference range.
Open calculator →Macro Calculator
Compare balanced, high-protein, athlete and keto macro examples and convert your calorie budget into grams.
Open calculator →BMR Calculator
Estimate resting energy with the simplified Mifflin–St Jeor equation and understand how it differs from daily calorie expenditure.
Open calculator →TDEE Calculator
Estimate total daily energy expenditure by combining resting energy with a selected activity multiplier.
Open calculator →BMI Calculator
Calculate adult body mass index from height and weight and view the corresponding CDC screening category.
Open calculator →Ideal Weight Calculator
Compare Devine, Robinson and Miller reference weights while understanding why no formula defines your personal ideal weight.
Open calculator →Water Intake Calculator
Explore a weight-based fluid estimate with clearly labeled, adjustable activity and climate allowances.
Open calculator →Weight Loss Calculator
Explore a chosen calorie deficit relative to estimated maintenance and see the limitations of static weight-change arithmetic.
Open calculator →Weight Gain Calculator
Explore a chosen calorie surplus relative to estimated maintenance and see the limitations of static weight-change arithmetic.
Open calculator →Body Fat Calculator
Estimate body-fat percentage from height and circumference measurements using the historical US Navy tape equations.
Open calculator →Calculations run in your browser. Food searches contact this website; calculator measurements are not sent by this plugin.