1RM
Calculator.
Enter the weight and reps you completed. We'll estimate your one-rep max and full rep max table.
Track your rep maxes over time and get automatic progression suggestions.
What is a 1RM?
Your one-rep max (1RM) is the maximum weight you can lift for a single repetition with proper form. It's the gold standard for measuring absolute strength and is used to program training percentages, track progress, and compare performance across exercises.
How is it calculated?
This calculator uses the Epley formula: 1RM = weight × (1 + reps / 30). It's one of the most widely used and accurate formulas for estimating 1RM from submaximal lifts, especially for sets of 2–10 reps.
Why estimate instead of testing?
True 1RM tests are physically demanding and carry higher injury risk. Estimating from a set of 3–5 reps gives you a reliable number you can use for programming without the recovery cost of a max attempt.
Track your progress automatically
With reppd, your estimated 1RM is calculated automatically for every exercise. Get progression suggestions, track trends over time, and see how your strength compares — all with end-to-end encryption.