What is BMR and TDEE?

BMR (Basal Metabolic Rate) is the number of calories your body burns at rest. TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor, representing total calories burned in a day. Our calculator uses the Mifflin-St Jeor equation for accurate estimates.

How is one rep max calculated?

One rep max (1RM) is estimated using proven formulas like Epley, Brzycki, and Lombardi. Enter the weight lifted and number of reps completed. The calculator provides an estimated maximum weight you can lift for a single repetition across multiple formulas.

How accurate are the heart rate training zones?

Heart rate zones are calculated using your age-based maximum heart rate (220 minus age). The zones range from light warm-up (50-60%) to maximum effort (90-100%). For more accurate results, use a measured resting heart rate and the Karvonen formula.

Fitness & Health Calculators 6 Tools

Free online fitness and health calculators for athletes, gym-goers, and health-conscious individuals. Calculate your BMR, TDEE, one rep max, walking calorie burn, heart rate training zones, and track body measurements — all in your browser.

BMR & TDEE Calculator Advanced BMR and TDEE with multiple formula options. Metabolism

One Rep Max Calculator Estimate one-rep max from submaximal lifts. Strength

Walking Calorie Burn Calculate calories burned while walking. Cardio

Exercise Calorie Burn Calculate calories burned for different exercises. Cardio

Heart Rate Zone Calculator Calculate training heart rate zones by age. Training

Body Measurement Tracker Track body measurements over time with charts. Tracking

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Last updated: June 2026