Calculate Your One-Rep Max (1RM)
Use the calculator below for any lift to estimate your one-rep max based on the amount of weight you can lift on a given move, and the number of clean reps you can achieve before muscle failure.
Why do you need to calculate your 1RM?
Strength coaches set up programs with percentages based on your 1RM because they don’t know your actual strength level, but they know what percentages they want you to be using relative to your single-rep max. The calculator gives you all the relevant loads, which are done simply by multiplying the percentage by your 1RM.
Some programs are set up a little differently and will instead tell you to do your 3RM, 6RM, or some other number. What’s different here is that instead of a giving you a percentage of your one-rep max, you’ll see 3RM, which indicates you should use a weight that you can do for three and only three reps. You’ll need the table below to essentially do the conversion in a different way.
To figure out your 1RM without actually attempting it, estimate it by doing a set of 5–10 reps with lower weight. Then, find this weight and locate your 1RM estimation on a 1RM chart that lists the amount of weight you can lift 10 times as about 75% of your 1RM. Another way to estimate 1RM is to use websites and mobile applications that use equations to predict your maximum strength.