What is this calculator?
Estimate a one-repetition maximum using the Epley model.
What can you use it for?
Use it to understand the numerical relationship between the measurements or dates entered. Estimate a one-repetition maximum using the Epley model.
How to use it
- Enter weight lifted.
- Enter repetitions.
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
Epley estimate = lifted weight × (1 + repetitions ÷ 30)
For one actual repetition, the entered lifted weight is returned. This model is restricted to 1–10 repetitions.
Worked example
Weight lifted: 60, Repetitions: 5. The result is 70 (estimated one-rep maximum).
Assumptions and limits
A training estimate from 1–10 repetitions, not an instruction to attempt the weight.
Frequently asked questions
What inputs does the One Rep Max Calculator need?
Use weight lifted, repetitions. Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the One Rep Max Calculator?
A training estimate from 1–10 repetitions, not an instruction to attempt the weight.