Estimate one-repetition maximum (1RM) from a lifted weight and repetition count using common strength formulas.
Body composition, energy, strength and fitness estimates for general reference.
Enter the requested values above and select Calculate. Change any input to compare scenarios instantly.
If you lift 185 lb for 8 repetitions, the calculator estimates a one-rep maximum from multiple formulas.
Estimate one-repetition maximum (1RM) from a lifted weight and repetition count using common strength formulas. Use it for quick estimates and comparisons; verify high-stakes health, training or measurement decisions with an appropriate authoritative source.
Estimate one-repetition maximum (1RM) from a lifted weight and repetition count using common strength formulas.
Estimates 1RM using Epley, Brzycki and Lombardi formulas and shows their average.
Yes. ERICH Calculators is free to use and no account is required.
1RM equations are training estimates. Do not attempt a maximal lift solely from a calculator result; use appropriate technique, spotting and coaching.
See how formulas, sources and limitations are handled across ERICH Calculators.