One-Rep Max (1RM) Calculator

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Estimate your maximum lifting capacity (1RM) based on weight lifted and repetitions.

Weight Lifted (kg/lbs)

Repetitions (1 - 30)

Understanding One-Rep Max Calculations

Your **One-Rep Max (1RM)** represents the maximum amount of weight you can lift for a single repetition of an exercise. Knowing your 1RM is essential for structuring training cycles like 5/3/1, linear progression, and progressive overload programs.

Frequently Asked Questions

Yes, for reps under 10, Epley and Brzycki formulas are highly accurate (within 2-3% error margin).

Direct testing is dangerous for beginners. Estimating it from sub-maximal repetitions (e.g. 5 reps) is much safer.