Calculators & Tools

The same formulas as the app — run instantly in your browser. Share results with a link.

1RM Calculator

Estimate your one-rep max from any set — no max-out attempt needed.

Find your maintenance calories — the foundation of any nutrition plan.

Split your calories into protein, carbs and fat that fit your goal.

Estimate body-fat percentage with a tape measure — the U.S. Navy method.

Your body mass index and the healthy-weight range for your height.

How much muscle you carry for your height — the lean version of BMI.

How much water to drink per day, based on your weight and activity.

Which plates to load on each side of the bar for any target weight.