Free Tool
One Rep Max Calculator
Estimate your 1RM from any weight and rep combination.
Most accurate for 1-10 reps
Your Estimated 1RM
Enter weight and reps to calculate
Track Your Strength Progress
NuJourney automatically tracks your progressive overload and estimates 1RM over time.
Start Free TrialWhat is a One Rep Max (1RM)?
Your one rep max is the maximum weight you can lift for a single repetition with proper form. It's used to calculate training percentages and track strength progress.
How to Use This Calculator
Enter any weight you've lifted and how many reps you completed. The calculator uses the Brzycki formula to estimate your 1RM. Most accurate with 1-10 reps.