One-Rep Max Calculator

Estimate the most you could lift once from a set you’ve done for several reps.

Fractions and decimals both work.
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1RM estimate
Epley
Brzycki
Lombardi
Training loads
Work

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One-Rep Max Formulas

Epley: w × (1 + reps ÷ 30)   Brzycki: w × 36 ÷ (37 − reps)   Lombardi: w × reps^0.10

Worked Example

Tips

Use a set taken close to failure with good form. These are estimates; test a true max only with a spotter and a proper warm-up. Works in any unit (lb or kg).