About the Percentage of 1RM Calculator
Working weights for any percentage of your one rep max, rounded to the plates you have.
Also known as: 1rm percentage table, percentage based training, weight percentage calculator, percentage-based-loading, weight-percentage.
How to use this calculator
- Enter one rep max, percentage, round to nearest, unit.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Working weight = 1RM × percentage
Worked example
Using the values pre-filled in the calculator above:
- One rep max = 150
- Percentage = 75 %
- Round to nearest = 2.5
- Unit: kg
the calculator returns:
- 75% of 1RM: 112.5 kg
- Exact: 112.5 kg