GlenCalc

One rep max calculator

Instead of testing a true maximum, estimate it from a set of several reps to failure. The formulas are most accurate for sets of 10 reps or fewer.

Your answer

Estimated one-rep max219 lbAverage of three formulas
Epley222 lb
Brzycki214.8 lb
Lombardi221.3 lb
Training loads
% of 1RMWeight (lb)Typical reps
95%2082
90%1974
85%1866
80%1768
75%16510
70%15412
65%14315

Worked out in your browser. Nothing you type is sent to a server.

How we worked it out

Updated as you change the numbers.

  1. Epley = w × (1 + r ÷ 30) = 222. Brzycki = w × 36 ÷ (37 − r) = 214.8. Lombardi = w × r^0.1 = 221.3.

Method and assumptions

Each formula fits the relationship between load and reps to failure. They agree closely for 2 to 10 reps and spread out beyond that. The weight is in whatever unit you entered.

Questions

What is my 1RM if I bench 185 lb for 6 reps?

About 219 lb (the average of the three formulas).

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

Embed this calculator on your site

Free to use. Paste this where you want the calculator; it runs in your visitors’ browsers, sets no cookies and sends nothing to us.

Related calculators