Enter the weight lifted for 10 reps (lbs) and the number of reps performed in the exercise into the Calculator. The calculator will evaluate the 1RM from Brzycki Equation. 

1RM from Brzycki Equation Formula

1RM = w / [(1.0278)-(.0278*r)]

Variables:

  • 1RM is the 1RM from Brzycki Equation (lbs)
  • w is the weight lifted for 10 reps (lbs)
  • r is the number of reps performed in the exercise

How to Calculate 1RM from Brzycki Equation?

The following steps outline how to calculate the 1RM from Brzycki Equation.

  1. First, determine the weight lifted for 10 reps (lbs). 
  2. Next, determine the number of reps performed in the exercise. 
  3. Next, gather the formula from above = 1RM = w / [(1.0278)-(.0278*r)].
  4. Finally, calculate the 1RM from Brzycki Equation.
  5. 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 for 10 reps (lbs) = 300

number of reps performed in the exercise = 15