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One Rep Max Calculator

Inputs

Weight Lifted(kg)

The weight you lifted for the given number of reps

Reps Performed(reps)

Number of repetitions completed at that weight

Estimation Formula

Different formulas provide different estimates

Estimated One Rep Max

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Your maximum lift weight for a single repetition

Percentage of 1RM

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Strength Assessment

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Formula

Epley: 1RM = W × (1 + R/30) | Brzycki: 1RM = W / (1.0278 - 0.0278 × R) | Lander: 1RM = (100 × W) / (101.3 - 2.67123 × R)