🏋️ Fitness, Strength & Weight Loss

7 calculators in this category.

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Training tools for runners and lifters, plus weight-loss planning calculators based on published research.

Calorie Deficit

Find the daily calories to eat for weight loss and the date you will reach your goal weight, with a deficit that adapts as your weight falls.

GLP-1 Weight Loss

See the average weight loss over time seen in clinical trials of semaglutide (Wegovy), tirzepatide (Zepbound, Mounjaro) and liraglutide, applied to your starting weight.

One Rep Max

Estimate your one-rep max from any set of up to 15 reps with the Epley, Brzycki and Lombardi formulas, plus a percentage chart for training.

VO2 Max

Estimate your VO2 max from a Cooper 12-minute run, your resting heart rate or a 1.5-mile run time, and see how it rates for your age and sex.

Race Time Predictor

Predict your race times for the mile, 5K, 10K, half marathon and marathon from a recent race result, using Riegel's formula, with paces.

Lean Body Mass

Calculate your lean body mass and fat mass with the Boer, James and Hume formulas, or from your body fat percentage.

FFMI Calculator

Calculate your fat-free mass index (FFMI) and height-adjusted FFMI from weight, height and body fat, and see how muscular you are.

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