A complete collection of free, accurate fitness calculators for tracking your body, calories, and lifts.
Check your Body Mass Index in seconds.
Daily calories for cutting, maintaining or bulking.
Estimate your 1RM and training percentages.
How much protein to build or keep muscle.
Estimate body fat with the Navy method.
Whether you are just starting your fitness journey or chasing a competition-ready physique, the right numbers keep you on track. Our free calculators cover the essentials: your body composition, your energy needs, and your strength. Each tool is built on established scientific formulas and works instantly in your browser — no downloads, no sign-ups, and no data leaves your device.
Start with the Calorie Calculator to set your daily intake, use the Protein Calculator to hit your macros, and track your body fat percentage over time. As you get stronger, the One Rep Max Calculator helps you program your training with proven percentage-based routines.