Free Gym AI tool
Free fitness calculators
Practical lifting and nutrition tools — each one links into Gym AI Pro when you are ready for AI programming.
1RM Calculator
Estimate your one-rep max with Epley and Brzycki formulas. Free strength tool from Gym AI.
Calorie Calculator
Estimate maintenance calories with Mifflin-St Jeor. Free TDEE tool from Gym AI.
Macro Calculator
Protein, carbs, and fat targets from your calories and goal. Free Gym AI tool.
FFMI Calculator
Calculate FFMI and height-adjusted FFMI. Free body composition tool from Gym AI.
Wilks Calculator
Compare powerlifting totals across bodyweights with the classic Wilks formula.
Protein Calculator
Find protein targets for cutting, maintaining, or bulking. Free Gym AI tool.
Body Fat Calculator
Estimate body fat with the US Navy method. Free Gym AI calculator.
BMI Calculator
Quick body mass index calculator. Free fitness tool from Gym AI.
Maintenance Calories
Find your TDEE maintenance calories. Free Gym AI nutrition tool.
Bulking Calories
Surplus calories for lean muscle gain. Free Gym AI tool.
Cutting Calories
Deficit calories for fat loss while training. Free Gym AI tool.
Bodybuilding Calculator
1RM, calories, macros, FFMI, and protein tools for bodybuilders — free from Gym AI.
Estimates only — not medical advice. Results vary with technique, sleep, and nutrition.