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One Rep Max Calculator - 1RM Estimator

Free one rep max calculator. Estimate your 1RM for any lift using the Epley, Brzycki, or Lander formula. Get training percentages.

Estimate your maximum single rep

Enter your values to see results

and click the "Calculate" button

One Rep Max Calculator

Estimate your one rep max without actually lifting maximum weight. Use submaximal lifts (3-10 reps) for safer estimation.

Epley: Weight × (1 + Reps/30) | Brzycki: Weight × 36/(37 - Reps)

Most accurate with 3-10 reps. Higher rep estimates become less reliable. Use same formula consistently for tracking progress.

Which formula is most accurate?

Epley and Brzycki are both reliable. Epley tends to give slightly higher estimates. Use the same formula consistently to track progress.

How many reps should I test with?

5-8 reps is ideal balance of accuracy and safety. 1-3 reps are very accurate but risky. 10+ reps become unreliable.

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