One Rep Max Calculator

This One Rep Max Calculator will estimate your 1RM based on the weight and number of reps you can perform.

How to use the calculator:

Step 1: Select the weight you lifted

Step 2: Select the maximum reps you can perform with that weight

​ ​Why is 10 the maximum the maximum reps I can select?

​ ​Two main reasons:
​ ​ ​The higher the rep count the less accurate the calculator.
​ ​ ​If you are hitting more than 10 reps, the weight isn’t heavy enough to test you.