1RM Calculator

Enter a set you've actually done and it'll estimate your one rep max, then show you what every percentage of it weighs.

Your estimated one rep max

116.5 kg

What each percentage weighs

Rep guides are typical, not a rule. Some people get more reps at a given percentage, some fewer. Round to whatever your gym's plates allow.

100%
1 rep
-
95%
2 reps
-
92.5%
3 reps
-
90%
4 reps
-
87.5%
5 reps
-
85%
6 reps
-
82.5%
7 reps
-
80%
8 reps
-
77.5%
9 reps
-
75%
10 reps
-
70%
12 reps
-
65%
15 reps
-
60%
18 to 20 reps
-

This uses the Epley formula: your estimated max is the weight multiplied by one plus the reps divided by thirty. It's an estimate, not a test result, and it's most accurate between three and ten reps. Above ten it starts flattering you. Please don't go and try to lift the number to check.

Want a twelve week program that works all this out for you?

See The Base Set Free downloads