One Rep Max
A calculator for estimating your 1RM in weightlifting sports
One Rep Max launched on November 3, 2019 with 85 votes, #404 of 3,203 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 6 years on.
What it does
One Rep Max is a simple tool for estimating lifting maxes. You can use the browser version, or you can add the app to your home screen on your phone (and even use it offline). Customize the results by changing the formula, rounding, increment, and unit.
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One Rep Max CalculatorJun 2026 · onerepmaxcalculator.proCalculate One Rep Max (1RM) instantly with Brzycki, Epley
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