Free fitness & nutrition calculators

Quick, honest estimates built on the Mifflin-St Jeor equation. No sign-up needed.

Calorie Calculator

Find out roughly how many calories you need per day to lose fat, maintain, or build muscle. Uses the Mifflin-St Jeor equation, the formula most dietitians start with.

Open calculator →

Protein Calculator

Get a daily protein target in grams based on your body weight and goal, plus a per-meal breakdown that makes it easier to actually hit.

Open calculator →

TDEE Calculator

Estimate how many calories you burn in a typical day, your total daily energy expenditure, and see how it changes with activity.

Open calculator →

Looking for more depth? Browse our fitness and nutrition guides.