Calculate your maximum strength potential and get personalized training loads for optimal strength and muscle building.
Enter your lift details to estimate your one rep maximum
Best practices for accurate results:
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Try it nowOne Rep Max (1RM) is the maximum weight you can lift for a single repetition with proper form.
Use 80-85% of your 1RM for strength training and 65-75% for hypertrophy (muscle building).
1RM is your maximum single-rep strength. Use lower rep ranges (1-10) for more accurate estimates.
Your one-rep max is the heaviest weight you can lift for a single repetition of an exercise with good form. It is the standard benchmark for measuring strength.
This calculator uses validated formulas (such as Epley and Brzycki) to estimate your 1RM from a submaximal set, so you avoid the injury risk of true max-effort testing.
Most strength programs prescribe loads as a percentage of 1RM. Use the table to find the weight for a target intensity, for example 80% of 1RM for sets of 3–5 reps.