One Rep Max Calculator
Estimate your one-repetition maximum (1RM) from a submaximal lift using the Epley and Brzycki formulas.
| Lift Details | Enter Value |
|---|---|
| Weight lifted | |
| Repetitions completed |
Enter the weight and number of reps completed.
Practical Example
Enter a simple real-world example using values you can verify independently. Run the tool, review the result, and then change one input to see how the output responds.
Factors That Affect the Result
Input accuracy, selected units, rates, assumptions, rounding and time periods can affect the result depending on the tool. Use consistent values and verify important outputs against a reliable reference.
Frequently Asked Questions
Can I compare different inputs?
Yes. Change the values and run the tool again to compare scenarios.
Can rounding affect the result?
Yes. Small differences may occur when values are rounded.
Should I verify important results?
Yes. Confirm critical financial, technical or measurement results independently.