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One Rep Max Calculator

1RM from a lifted weight and reps.

One rep max

Estimated 1RM
213.8 lb
Average of 3 formulas
Epley
215.8 lb
W × (1 + reps/30)
Brzycki
208.1 lb
W × 36 ÷ (37 − reps)
Lombardi
217.3 lb
W × reps^0.10
Training percentages
150 · 171 · 192
70% / 80% / 90% of 1RM
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One Rep Max Calculator · Generated 5/2/2026 · calccenter.online/calculators/health/one-rep-max

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About the One Rep Max Calculator

MethodologyHome

1RM from a lifted weight and reps. Use this free one rep max calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this One Rep Max Calculator do?

1RM from a lifted weight and reps.

Is it free?

Yes — every calculator on Calc Center is free, with no sign-up or account required.

Does it work offline?

The site is a Progressive Web App — after your first visit, most pages work without an internet connection.