Transparent tools
Nutrition calculators
Useful starting estimates, with the equation behind every result and its limits shown. Each tool shows the equation it uses and what it cannot tell you.
10 tools, no sign-up Nothing you enter leaves your browser
Calculator BMI Calculator Estimates weight relative to height. It does not measure body composition. Open tool Calculator BMR Calculator Estimates energy used at rest with the Mifflin–St Jeor equation. Open tool Calculator TDEE Calculator Estimates daily energy use by applying an activity factor to BMR. Open tool Calculator Protein Intake Calculator Provides a general protein range based on body weight and activity. Open tool Calculator Calorie Needs Calculator Estimates maintenance energy needs; actual needs vary. Open tool Calculator Water Intake Calculator Offers a starting fluid estimate adjusted for activity. Open tool Calculator Macro Calculator Splits an estimated energy target across protein, carbohydrate and fat. Open tool Calculator Reference Weight Range Shows a broad BMI-based reference range, not a personal ideal. Open tool Calculator Body Fat Estimate Uses circumference inputs for a rough population-level estimate. Open tool Calculator Fibre Intake Guide Provides an age- and sex-based general fibre reference. Open tool