Enter the metal weight loss (mg), the metal density (g/mm^3), the total time (years), and the area of the sample (mm^2) into the Corrosion Rate Calculator. The calculator will evaluate the Corrosion Rate. 

Corrosion Rate Formula

The following formula is used to calculate the Corrosion Rate. 

COR = W / (D*A*T)

  • Where COR is the Corrosion Rate (mm/year)
  • W is the metal weight loss (mg) 
  • D is the metal density (g/mm^3) 
  • A is the area of the sample (mm^2) 
  • T is the total time (years)

How to Calculate Corrosion Rate?

The following two example problems outline the steps and information needed to calculate the Corrosion Rate.

Example Problem #1

  1. First, determine the metal weight loss (mg).
    • The metal weight loss (mg) is calculated to be : 50.
  2. Next, determine the metal density (g/mm^3). 
    • The metal density (g/mm^3) is measured to be: 10.
  3. Next, determine the area of sample (mm^2). 
    • The area of sample (mm^2) is found to be: 3.
  4. Next, determine the total time in years.
    • This is given as 3 years.
  5. Finally, calculate the Corrosion Rate using the formula above: 

COR = W / (D*A*T)

The values provided above are inserted into the equation below and computed.

COR = 50 / (10*3*3) = .55 (mm/year)


Example Problem #2

The variables required for this problem are provided below:

metal weight loss (mg) = 60

metal density (g/mm^3) = 4

area of sample (mm^2) = 5

time (years) = 2

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

COR = W / (D*A*T) = (mm/year)