One Rep Max Calculator
Estimate 1RM using Epley and Brzycki formulas.
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Formula
1RM = weight × (1 + reps / 30) (Epley)
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Estimated 1RM
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Epley
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Brzycki
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How This One Rep Max Calculator Works
This calculator uses established scientific formulas validated in peer-reviewed literature. All calculations run locally in your browser — no data is sent to any server.
Frequently Asked Questions
How accurate is this?
Uses well-established formulas accurate for most people. Individual variation is normal.
Is my data stored?
No. All calculations run in your browser. No data collected.
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