One-Rep Max Calculator

Enter the information you have for one Rep Max in the One Rep Max. The explanation below the tool helps you check the method and its limits.

Weight lifted

Reps

Estimated 1RM (Epley)

—

Brzycki—

For 5 reps (~87%)—

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How it works

Epley: w × (1 + reps/30); Brzycki: w × 36 ÷ (37 − reps)

How to use the One Rep Max

Enter the requested values and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options.

This is a general estimate and cannot replace advice from a qualified health professional.

Frequently Asked Questions

How does the One-Rep Max Calculator work?

Estimate your one-rep max from the weight and reps of a set, using two common formulas.

Is this medical advice?

No. It gives general estimates only. For decisions about your health, speak with a qualified professional.

Can I use the result as an exact answer?

Treat it as an estimate or check unless the page and the rules that apply to you confirm otherwise. Rounding, fees and personal details can change the final result.