Enter the washer outer diameter (in), the washer inner diameter (in), and the washer thickness (in) into the Flat Washer Weight Calculator. The calculator will evaluate the Flat Washer Weight.

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## Flat Washer Weight Formula

The following formula is used to calculate the Flat Washer Weight.

FWW = pi*(OD^2/4 - ID^2/4) * T * d

Variables:

- FWW is the Flat Washer Weight (lbs)
- OD is the washer outer diameter (in)
- ID is the washer inner diameter (in)
- T is the washer thickness (in)
- d is the material density (lbs/in^3)

## How to Calculate Flat Washer Weight?

The following two example problems outline the steps and information needed to calculate the Flat Washer Weight.

**Example Problem #1**

- First, determine the washer outer diameter (in).
- The washer outer diameter (in) is calculated to be : 10.

- Next, determine the washer inner diameter (in).
- The washer inner diameter (in) is measured to be: 5.

- Next, determine the washer thickness (in).
- The washer thickness (in) is found to be: 2.

- Next, determine the density.
- This is given as 1.25 lbs/in^3.

- Finally, calculate the Flat Washer Weight using the formula above:

FWW = pi*(OD^2/4 – ID^2/4) * T * d

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

FWW = pi*(10^2/4 – 5^2/4) * 2 * 1.25 = 147.462 (lbs)

**Example Problem #2**

The variables required for this problem are provided below:

washer outer diameter (in) = 30

washer inner diameter (in) = 20

washer thickness (in) = 5

Test your knowledge and check your answer with the calculator.

FWW = pI*(OD^2/4 – ID^2/4) * T * d =** **(lbs)