TrainerTrue provides a complete suite of free professional fitness calculators used by personal trainers, strength coaches, and serious athletes across the United States. Every tool is built on peer-reviewed formulas and validated methods — not generic estimates.
Whether you're calculating your TDEE to plan your diet, measuring your body fat percentage with the US Navy method, or finding your one-rep maximum for strength programming, TrainerTrue gives you the precision data you need to make real progress.
Most online fitness calculators use outdated formulas or oversimplified models. TrainerTrue uses the same methods trusted by the NSCA (National Strength and Conditioning Association). Our TDEE calculator uses the Mifflin-St Jeor equation — the most accurate BMR formula. Our 1RM calculator combines Epley, Brzycki, and Lombardi formulas for greater accuracy.
Every calculator supports both metric and imperial units and is fully optimized for mobile devices.
Start with the TDEE Calculator to find your daily calorie needs. Then use the Macro Calculator to split those calories. Use the Body Fat Calculator to track body composition. The 1RM Calculator helps you program training zones correctly. Together, these tools give you a complete picture of your nutrition and training.