How this calculator works
This calculator applies a direct formula to the values you enter and returns the result instantly.
Free calculator
One Rep Max Calculator
Estimate your one-rep max using lifted weight and repetitions performed.
Instant result
Estimated one-rep max
215.83 lb
Calculator results are provided for planning and educational purposes. For taxes, legal decisions, lending, or medical advice, verify the numbers with an official source or qualified professional.
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About this calculator
Use this one rep max calculator to get a quick estimate with simple inputs and an instant result.
How to use it
- Enter your weight lifted.
- Enter your repetitions.
- Review the result and change the inputs to compare different scenarios.
Example
For example, try the one rep max calculator using Weight lifted 185, Repetitions 5 to see how the estimate works before entering your own numbers.
Frequently asked questions
What does the one rep max calculator show?
The one rep max calculator gives you a quick estimate based on the values you enter. It is useful for planning, comparison, and everyday decisions.
Is the one rep max calculator exact?
The result follows the formula described on the page, but it should still be treated as an estimate. Fees, local rules, taxes, rounding, or professional guidance can change the final outcome.
Who is this tool for?
This tool is designed for people who want a fast health calculator estimate without using a spreadsheet.