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**

- First, determine the metal weight loss (mg).
- The metal weight loss (mg) is calculated to be : 50.

- Next, determine the metal density (g/mm^3).
- The metal density (g/mm^3) is measured to be: 10.

- Next, determine the area of sample (mm^2).
- The area of sample (mm^2) is found to be: 3.

- Next, determine the total time in years.
- This is given as 3 years.

- 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)