Free Fitness Calculators

Science-backed tools to help you understand your body and optimize your training.

Body

Understand your body composition and daily needs

BMI Calculator

Calculate your Body Mass Index to understand if your weight is in a healthy range for your height.

TDEE Calculator

Find out how many calories you burn daily based on your stats and activity level.

Macro Calculator

Get your optimal protein, carb, and fat targets based on your TDEE and fitness goal.

Deficit & Surplus Calculator

Fine-tune your calorie deficit or surplus and see a realistic weight projection over 24 weeks.

Protein Intake Calculator

Calculate your daily protein target and per-meal distribution based on your body and goals.

Body Fat Calculator

Estimate your body fat percentage using the US Navy circumference method.

FFMI Calculator

Calculate your Fat-Free Mass Index and see how close you are to your natural muscular potential.

Performance

Measure and compare your strength

One Rep Max (1RM) Calculator

Estimate your maximum lift for any exercise based on the weight and reps you can perform.

Strength Level Calculator

Rate your strength across major lifts using the Wilks coefficient and see your overall power level.

Understand your body better

Whether you're just starting your fitness journey or optimizing your training, these calculators give you the data you need. All calculations use peer-reviewed, science-backed formulas used by fitness professionals worldwide.