Gym Calculators

Free, accurate tools for lifters — estimate your max, dial in calories and macros, load the bar, and score your strength. No sign-up.

1RM Calculator

Estimate your one-rep max (1RM) from any set — enter the weight and reps you lifted and get your projected max plus a full percentage table for programming your working sets.

Plate Calculator

Stop doing plate math mid-set. Enter your target weight and bar weight and see exactly which plates to load per side — in kilograms or pounds.

TDEE & Macro Calculator

Find your Total Daily Energy Expenditure and a macro split that matches your goal. Enter your stats, pick your activity level, and choose cut, maintain, or bulk.

Compare strength across bodyweights. Enter your total (or a single lift) and bodyweight to get your Wilks and DOTS scores — the coefficients powerlifting uses to rank lifters fairly across weight classes.

FFMI Calculator

FFMI (Fat-Free Mass Index) gauges how much lean mass you carry relative to your height — a better muscularity metric than BMI. Enter weight, height, and body-fat percentage.

RPE Calculator

Convert Rate of Perceived Exertion (RPE) and reps into a percentage of your 1RM — and estimate your max from any rated set. Based on the Reactive Training Systems chart.