What is a 1RM in weightlifting?
1RM (One-Rep Max) is the maximum amount of weight you can lift for a single, fully executed repetition.
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Free One-Rep Max (1RM) Calculator | 1ClickTools
Calculate one-rep max (1rm) calculator instantly with Epley formula [W × (1 + R/30)] and Brzycki formula [W × (36 / (37 - R))].
Frequently Asked Questions
What is the Epley 1RM formula?
1RM = Weight × (1 + Reps / 30).
How accurate is the One-Rep Max (1RM) Calculator?
All calculations are executed using standard mathematical algorithms directly in client-side JavaScript, ensuring double-precision floating-point accuracy without server-side rounding discrepancies.
Is my input data kept private when using the One-Rep Max (1RM) Calculator?
Yes. 1ClickTools operates 100% locally in your web browser session. No personal data, financial values, or calculation inputs are ever uploaded, saved, or transmitted to any external servers.
Can I use this tool for commercial or academic projects?
Yes. 1ClickTools provides 100% free access for personal, academic, professional, and commercial use without subscription fees or usage caps.