Enter the average precision and the average tolerance into the Precision to Tolerance Ratio Calculator. The calculator will evaluate and display the Precision to Tolerance Ratio. 

Precision to Tolerance Ratio Formula

The following formula is used to calculate the Precision to Tolerance Ratio. 

PTR = P / T

  • Where PTR is the Precision to Tolerance Ratio ( )
  • P is the average precision 
  • T is the average tolerance 

How to Calculate Precision to Tolerance Ratio?

The following example problems outline how to calculate Precision to Tolerance Ratio.

Example Problem #1:

  1. First, determine the average precision. 
    • The average precision is given as: 4.5.
  2. Next, determine the average tolerance. 
    • The average tolerance is provided as: 6.75.
  3. Finally, calculate the Precision to Tolerance Ratio using the equation above: 

PTR = P / T

The values given above are inserted into the equation below and the solution is calculated:

PTR = 4.5 / 6.75 = .666


Example Problem #2: 

For this problem, the variables required are provided below:

average precision = 8.00

average tolerance = 9.25

Test your knowledge using the equation and check your answer with the calculator above.

PTR = P / T = ?