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One Rep Max (1RM) Calculator
Estimate your one-rep max for any lift from the weight and reps you completed, using proven strength formulas.
How to use this tool
- 1Paste or type your input above.
- 2The result updates instantly.
- 3Copy the output with one click.
Frequently asked questions
How is one-rep max estimated?+
It uses the Epley and Brzycki formulas: 1RM β weight Γ (1 + reps Γ· 30). The tool averages the common formulas for a reliable estimate.
Is this a substitute for medical advice?+
No. These calculators are for general information and education only. Consult a qualified healthcare professional for personal medical advice.
Is my data private?+
Yes. The tool runs entirely in your browser β nothing you paste or type is uploaded to a server.
Learn more
- One Rep Max (1RM) Calculator: how it works
- What your one rep max result means
- Healthy ranges and next steps