1-Rep Max Calculator
Estimate your one-rep max from a sub-max set.
Estimated 1RM
260lb
Epley
263 lb
Brzycki
253 lb
Lombardi
264 lb
Working weights
95% (1 rep)247 lb
90% (3 reps)234 lb
85% (5 reps)221 lb
80% (8 reps)208 lb
75% (10 reps)195 lb
70% (12 reps)182 lb
About
Testing your real 1RM is risky and usually unnecessary. This calculator estimates it from a heavier-weight, lower-rep set you've actually done, using the Epley, Brzycki, and Lombardi formulas. The output is the average of all three, plus a percent-of-1RM table for picking working weights.
How to use
- Enter the weight you lifted and the reps you completed.
- See estimated 1RM (average of three formulas) and the per-formula breakdown.
- Use the percent table to pick working weights for sets of 3, 5, 8, 10, etc.
FAQ
Why three formulas?+
Each formula is fit to slightly different rep ranges. Averaging them smooths out the bias. Epley over-estimates at high reps. Brzycki under-estimates. The mean is more robust.
How accurate is this?+
Most accurate at 2 to 6 reps. By 10+ reps, the estimate degrades because endurance starts to matter as much as strength.