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 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 app StrengthLog.
Strength Standards from the Users of StrengthLog
Below are calculated median 1RM’s 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 percentage of 1RM you can use for 1–20 repetitions:
|Repetitions||Percentage of 1RM|