Use our 1RM calculator to estimate how much weight you can lift in a one-rep max.
Simply enter the number of reps you can do with a given weight (in any unit) and hit enter, and we will calculate not only your one-rep max, but also your 1–10RM.
Epley’s equation looks like this:
1RM = Weight (1 + Reps/30)
Note that this calculator is also available for free in our workout log.
What is 1RM?
1RM stands for one repetition maximum. It is the maximum amount of weight you can lift for a single repetition. In the same way, your 2RM is the maximum amount of weight you can lift for two repetitions, 3RM is the maximum weight you can lift for three repetitions, and so on.
Strength Standards from the Users of StrengthLog
Below are calculated median 1RMs for these lifts, using data from 45 158 users of our app StrengthLog.
Men’s Strength Standards, Median 1RM (kg)
|<80 kg Body Weight||80–100 kg Body Weight||100+ kg Body Weight|
Women’s Strength Standards, Median 1RM (kg)
|<60 kg Body Weight||60–80 kg Body Weight||80+ kg Body Weight|
How Many Reps Can You Do at a Given Percentage of Your 1RM?
Using Epley’s equation, we can estimate how many repetitions a person can typically do at a given percentage of 1RM. These are only estimates, of course, and the individual variation is big.
Here are the estimated percentages of 1RM you can use for a number of repetitions between 1 and 20:
|Repetitions||Percentage of 1RM|
How to Warm up for a 1RM Attempt
Time to go for a new 1RM?
Enter your target one-rep max in the field below, and we’ll calculate your warm-up weights.
Note: this calculator is also available (for free) in our workout app. When you track your training in our app, we also calculate the estimated 1RM of every set that you do.
You can read more about warming up for a one-rep maximum in this guide: How to Warm up for a 1RM Attempt.
What’s the Difference between 1RM and PR?
- PR stands for Personal Record and it is the heaviest weight you have ever lifted.
- 1RM stands for one-rep max and is the heaviest weight you can currently lift for one rep.
Your 1RM can both be higher or lower than your PR. And in contrast to your PR, your 1RM has nothing to do with whether or not you have actually ever lifted it.
Confused? Read more here: 1RM vs PR: What’s the Difference?
Want a good way to keep track of your PRs in any given exercise?
Check this out:
How To Increase Your 1RM
To increase your 1RM means to increase your maximum strength. There are many different ways to go about this, but the three main ones are to improve:
- Your muscle mass. A bigger muscle can produce more force. To build muscle efficiently, check out our muscle group training guides on this page.
- Your technique. With better technique, you can make better use of the muscle you’ve got. Check out our exercise technique guides, especially the ones for the squat, bench press, and deadlift.
- You neuromuscular efficiency. The last piece of the puzzle is how efficient your muscles are in terms of activation, contraction, and coordination. Our strength training programs are great for improving this, while simultaneously building muscle.