Science-backed calculators to help you train smarter. Estimate your calories, find your one-rep max, check your strength level, and more — all completely free.
Calculate your Basal Metabolic Rate and daily calorie needs
Estimate calories burned during any exercise using MET values
Generate a personalized AI workout program for free
Estimate your one rep max from any rep range
Compare your lifts to strength standards for your weight
Built by lifters, for lifters. Our tools are designed to give you actionable data without the noise.
Every calculator uses peer-reviewed equations and validated research data so you can trust your results.
No sign-ups, no paywalls. Get accurate fitness calculations in seconds, completely free.
Your data stays in your browser. We never store or share your personal fitness information.
These tools are just the start. Download Gymscore to get AI-powered form analysis, workout tracking, and personalized coaching — all in one app.