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Free One Rep Max Calculator
Calculate Your 1RM Now
Instantly estimate your One-Rep Max (1RM), design smarter training plans, and track your strength gains with our free, easy-to-use weightlifting tool.
Frequently Asked Questions
Please reach us at info@manbun.org if you cannot find an answer to your question.
For best results, perform 3–10 reps with a weight close to your max effort. Enter the number of reps and weight lifted into the calculator to estimate your 1RM safely.
Yes. The One Rep Max Calculator works for any compound lift — including bench press, squat, deadlift, overhead press, and more. Just enter the weight and reps you performed.
The Epley formula estimates your one rep max (1RM) using the equation:
1RM = weight × (1 + reps ÷ 30).
It’s widely used for its accuracy across moderate to high rep ranges.
One Rep Max Calculator – Estimate 1RM for Strength | Manbun
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