Fitness Calculators
BMI Calculator
Calculate your Body Mass Index using the WHO formula. Enter your height and weight to see your BMI category instantly.
✓ Know your weight classificationCalorie Calculator
Find your Total Daily Energy Expenditure using the Mifflin-St Jeor equation. Get calorie targets for fat loss, maintenance, and muscle gain.
✓ Plan your nutrition intakeMacro Calculator
Calculate your ideal daily protein, carbohydrate, and fat intake based on your calorie needs and fitness goal.
✓ Optimise your macrosBody Fat Calculator
Estimate your body fat percentage using the U.S. Navy formula. Get an accurate reading from simple measurements.
✓ Track your body composition1RM Calculator
Calculate your One Rep Max for any exercise using the Epley formula. Get percentage-based training percentages too.
✓ Plan your strength trainingWhy Use Our Calculators?
All GymGuide calculators use scientifically validated formulas — the same ones used by fitness professionals and nutritionists. Whether you are calculating your BMI, finding your daily calorie needs, splitting your macros, estimating body fat, or planning strength training, our tools give you accurate, actionable numbers.
The calculators are free, require no sign-in, and work on any device. For a fully personalised experience with AI-generated workout and meal plans, download the GymGuide app.