Enter the wrist circumference (in) into the Calculator. The calculator will evaluate your Max Arm Size. 

Max Arm Size Formula

MAS = WS +10


  • MAS is the Max Arm Size (in)
  • WS is the wrist circumference (in)

To calculate Max Arm Size, add 10 inches to the circumference of your wrist.

How to Calculate Max Arm Size?

The following steps outline how to calculate the Max Arm Size.

  1. First, determine the wrist circumference (in). 
  2. Next, gather the formula from above = MAS = WS +10.
  3. Finally, calculate the Max Arm Size.
  4. 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.

wrist circumference (in) = 7