Enter the duct height (in), the duct width (in), the duct length (in), and duct thickness (in) into the Duct Weight Calculator. The calculator will evaluate the Duct Weight.

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## Duct Weight Formula

The following formula is used to calculate the Duct Weight.

DW = ((2*(H+W))*L*T)*D

Variables:

- DW is the Duct Weight (lbs)
- H is the duct height (in)
- W is the duct width (in)
- L is the duct length (in)
- T is the duct thickness (in)
- D is the duct density (lbs/in^3)
- .1 lbs/in^3 for aluminum

To calculate a duct weight, multiply the sum of the height and width by 2, multiply again by the length and thickness, then finally again by the density.

## How to Calculate Duct Weight?

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

**Example Problem #1**

- First, determine the duct height (in).
- The duct height (in) is calculated to be : 10.

- Next, determine the duct width (in).
- The duct width (in) is measured to be: 15.

- Next, determine the duct length (in).
- The duct length (in) is found to be: 200.

- Next, determine the duct thickness (in).
- In this case the thickness is .25 inches.

- Finally, calculate the Duct Weight using the formula above:

DW = ((2*(H+W))*L*T)*D

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

DW = ((2*(10+15))*200*.25)*.1 = 250.00 (lbs)