Strength – 1RM Calculator

Estimate your one-repetition maximum using the Brzycki equation from a weight and reps you can safely lift.

Your Set

Result

Estimated 1RM

68 kg

About the Brzycki Formula

The Brzycki equation estimates 1RM from submaximal sets and is strongest at lower rep ranges (≤10). It’s an estimate and not a substitute for supervised testing.

References

  • Brzycki, M. Strength Testing—Predicting a One-Rep Max from Reps-to-Fatigue. Journal of Physical Education, Recreation & Dance, 64(1), 88–90.