One Rep Max (1RM) Calculators

Calculate your one rep max (1RM) for free. Get accurate estimates and training percentages using the Brzycki formula.

Popular Tools

Calculate exactly which plates you need for any weight on the bar. Take the confusion out of stacking weights.

Calculate your bench press one rep max (1RM) and get a complete percentage table for programming your training.

Calculate your squat one rep max (1RM) and get a complete percentage table for programming your training.

Calculate your deadlift one rep max (1RM) and get a complete percentage table for programming your training.

Uses the proven Brzycki formula for reliable one rep max estimates.

Get instant access to percentage tables for programming your workouts.

Shows exactly which plates to load on the bar for each weight.

A one-rep max (1RM) calculator estimates...