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1-Rep Max Calculator

Estimate your 1-rep max for any exercise. Epley formula. Enter weight and reps. Free, no sign-up.

๐Ÿ“– Read the complete 1-Rep Max Calculator guide โ†’

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Estimated 1-Rep Max

Formula

1RM = Weight ร— (1 + Reps รท 30) (Epley formula)

Example

80kg ร— 5 reps โ†’ 1RM = 80 ร— 1.167 = 93 kg

Frequently Asked Questions

Is it safe to test my 1RM?

Attempting a true 1RM without a spotter is risky. This calculator estimates it safely.

Which formula is most accurate?

Epley is widely used. Accuracy decreases for high rep counts (15+).

Why track 1RM?

It helps set training percentages for structured strength programs.

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