Enter the weight lifted and the number of repetitions into the calculator to estimate your one-repetition maximum (1RM) using the Epley Formula.
Epley Formula
The Epley Formula is used to estimate the maximum amount of weight one can lift in a single repetition (1RM) for a given exercise.
1RM = W * (1 + (R / 30))
Variables:
- 1RM is the one-repetition maximum (lbs)
- W is the weight lifted (lbs)
- R is the number of repetitions
To estimate the 1RM, multiply the weight lifted by the sum of one and the quotient of the number of repetitions divided by 30.
What is a One-Rep Max (1RM)?
A one-rep max (1RM) is the maximum amount of weight that a person can lift for one repetition of a given exercise. It is a standard measure used to assess an individual’s maximum strength and is commonly used by weightlifters, bodybuilders, and athletes. Knowing your 1RM can help you set appropriate weight levels for strength training and track your progress over time.
How to Calculate One-Rep Max (1RM)?
The following steps outline how to calculate the One-Rep Max (1RM) using the Epley Formula.
- First, determine the weight lifted (W) in pounds.
- Next, determine the number of repetitions (R) completed.
- Next, gather the formula from above = 1RM = W * (1 + (R / 30)).
- Finally, calculate the One-Rep Max (1RM) in pounds.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Weight lifted (W) = 200 lbs
Number of repetitions (R) = 5
