Health & Fitness Calculators

Strength, cardio, and nutrition numbers worth knowing before your next workout.

Estimate the heaviest weight you could lift for a single rep, based on a set you've already done.

Work out your normalized Fat-Free Mass Index and see how your muscularity compares to natural and enhanced lifters.

Get your daily fat, protein, and carb targets in grams, based on your stats, activity level, and goal.

Enter your last meal time and protocol to see exactly when your fasting window ends and your eating window opens.

Enter your 20-minute test average power to get your FTP and training power zones.

Enter the distance you covered in a 12-minute run to estimate your VO2 max.

Estimate calories burned on a rowing machine (ergometer) based on your weight, duration, and effort level.

See how many extra calories a weighted vest adds to your workout, compared to going unweighted.