Health & Fitness
One Rep Max Calculator
Estimate your one-rep max (1RM) from a lift and see training weights by rep count.
Free foreverRuns in your browserNo sign-up
70
Estimated 1-rep max (Epley)
Brzycki formula: 68. Estimates are most accurate for sets of 10 reps or fewer.
Training weights by reps
1 rep (100%)70
2 reps (95%)67
3 reps (90%)63
5 reps (87%)61
6 reps (85%)60
8 reps (80%)56
10 reps (75%)53
12 reps (70%)49
15 reps (65%)46
About the One Rep Max Calculator
Your one-rep max (1RM) is the most weight you can lift for a single repetition. This calculator estimates it from a set you have already done, so you do not have to attempt a risky max lift.
It uses the Epley formula for the main estimate and shows the Brzycki formula too, plus a handy table of suggested training weights for different rep ranges (as percentages of your 1RM).
Estimates are most accurate for sets of ten reps or fewer. Everything is calculated in your browser.
Key features
- Epley and Brzycki estimates
- Training weights by rep percentage
- No risky max attempt needed
- Private, in-browser calculation
How to use
- 1Enter the weight you lifted.
- 2Enter how many reps you completed.
- 3Read your estimated 1RM and training weights.
Frequently asked questions
- How accurate is an estimated 1RM?
- For sets of about 2 to 10 reps it is quite accurate. Above 10 reps the estimate becomes less reliable because endurance plays a bigger role.
- What are the percentages for?
- Many strength programs prescribe weights as a percentage of your 1RM. The table converts your estimated max into weights for common rep targets.