Free tools
Nutrition calculators
Transparent, science-based calculators. No signup, no email, no upsell.
Calorie Calculator
Estimate your daily energy needs.
Macro Calculator
Split calories into protein, carbs and fat.
Protein Calculator
Find a sensible daily protein target.
BMI Calculator
A quick, rough body-weight reference.
Ideal Weight Calculator
See a healthy weight range for your height.
These calculators use published equations (Mifflin-St Jeor for energy needs) and give population-level estimates. Individual needs vary.