How to interpret this estimate

Estimate a one-repetition maximum for strength planning. Uses the Epley estimate: weight multiplied by one plus repetitions divided by 30.

When this result is useful

Use this calculator to compare how Weight lifted and Repetitions change Estimated one-rep max and 80% training weight, and to review alternative values before using the estimate for planning.

Common limitations

The estimate is most useful for low-to-moderate repetition sets performed with consistent technique. Do not attempt a maximal lift without appropriate training, supervision, and safety equipment. Review the units and assumptions before interpreting the result.

This calculator uses the selected inputs and the fixed formula behind the tool to produce an estimate. Review the units, assumptions, and result labels before using the output for planning.

Health results are screening or planning estimates only. They do not diagnose health status or replace advice from doctors, dietitians, or qualified healthcare professionals.

Read the medical disclaimer for more context.