Nutrition Running Strength

One-Rep Max Calculator (1RM)

Estimate your 1RM using Epley and Brzycki formulas from any hard set of 2–12 reps.

Exercise (optional)

Weight lifted (kg)

Reps performed

Enter weight and reps of a hard set to estimate your 1RM.

Related calculators

RPE ↔ %1RM
Progressive Overload

How it works

The calculator uses two common equations to estimate your 1RM: Epley and Brzycki. Both extrapolate your max from a submaximal set performed close to failure, typically between 2 and 12 reps.

How to interpret

Use 1RM estimates to plan training loads by percentage. Keep in mind that fatigue, technique and exercise choice affect the result, so use it as a guideline rather than an exact number.

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