Which formula is most accurate?

The Epley formula is most commonly used and generally accurate for 2-10 reps. Brzycki may be more accurate for higher rep ranges. Individual variation means no formula is perfect for everyone.

Should I test my actual 1RM?

Testing true 1RM can be risky and should only be done with proper warm-up, spotters, and experience. For most people, calculating 1RM from submaximal lifts is safer and sufficient for training purposes.

One Rep Max Calculator – 1RM Strength Calculator

Calculate your one-rep max (1RM) for weightlifting using multiple proven formulas. Plan your strength training and track progress.

One Rep Max Calculator – 1RM Strength Calculator

Calculate your one-rep max (1RM) for weightlifting using multiple proven formulas. Plan your strength training and track progress.

Weight Lifted (kg)*

Weight you lifted for multiple reps

Repetitions*

Number of repetitions performed

Formula*

Choose calculation formula

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Enter weight and reps to see 1RM calculation

Understanding One Rep Max (1RM)

One Rep Max (1RM) is the maximum weight you can lift for a single repetition with proper form. It's a key metric in strength training for programming workouts, tracking progress, and comparing strength levels.

Common 1RM formulas: