One Rep Max Calculator
Estimate your maximum lifting strength using Epley and Brzycki formulas, with training percentages.
Lift Performance
Enter your last lift's weight and clean reps.
Best accuracy: 3–10 reps to failure.
Enter the weight you lifted and number of reps to estimate your 1RM.
What your result means
Your estimated 1RM is the heaviest weight you could lift once, useful for planning training loads.
Good to know
It is a prediction from sub-maximal lifts; never attempt a true max without supervision.
A number is a starting point, not a plan. Discuss your result with a doctor
Estimate the maximum weight you can lift for one repetition safely. Useful for strength training, progressive overload, and workout planning.
How this is calculated
Epley: 1RM = Weight × (1 + Reps / 30)
Brzycki: 1RM = Weight × 36 / (37 − Reps)
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