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)

To calculate the corrosion rate, divide the metal weight loss by the product of the density, area, and total time.

## 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