Using the calculator
Enter the values requested above. Estimate one repetition maximum and useful training percentages from a completed lift set.
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One Rep Max Calculator
Estimate one repetition maximum and useful training percentages from a completed lift set.
Enter your training and body measurements
Use the values from the workout, measurement, or training scenario you want to evaluate with the one rep max tool. Change one variable at a time when comparing scenarios.
Important: Results are educational planning estimates and are not a diagnosis or medical recommendation.
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How to use this calculator
Reading the result
The result shows one repetition maximum and useful training percentages from a completed lift set.
How it is calculated
The tool estimates a one repetition maximum from the weight lifted and repetitions completed, then applies percentages of that estimate to show reference training loads. Any 1RM equation is an estimate, especially as repetition counts rise.
Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.