One Rep Max Calculator
Estimate your one-rep max from a weight and reps, with the Epley formula.
Quick answer: enter your details below and click Estimate 1RM — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter the weight you lifted.
- Enter how many reps you completed.
- Click Estimate 1RM for the Epley estimate.
About this tool
Enter a weight you lifted and how many reps you managed, and the tool estimates your one-rep max with the Epley formula: weight times one plus reps divided by thirty. This is an estimate for programming training loads, not a test — never attempt a true one-rep max without proper coaching and safety.
Frequently asked questions
Should I try my estimated max?
Only with proper coaching, a spotter, and safe equipment. The estimate is for planning, not a challenge.
Does the unit matter?
No. The result is in whatever unit you entered — kilograms in, kilograms out.