Enter the duct cross-sectional area (ft^2) and the duct length (ft) into the Duct Volume Calculator. The calculator will evaluate and display the Duct Volume.

- All Volume Calculators
- Duct Velocity Calculator
- Duct Bend Area Calculator
- Return Air Duct Size Calculator

## Duct Volume Formula

The following formula is used to calculate the Duct Volume.

**Vd = CSA * L**

- Where Vd is the Duct Volume (ft^3)
- CSA is the duct cross-sectional area (ft^2)
- L is the duct length (ft)

## How to Calculate Duct Volume?

The following example problems outline how to calculate Duct Volume.

Example Problem #1:

- First, determine the duct cross-sectional area (ft^2).
- The duct cross-sectional area (ft^2) is given as: 3.

- Next, determine the duct length (ft).
- The duct length (ft) is provided as: 60.

- Finally, calculate the Duct Volume using the equation above:

Vd = CSA * L

The values given above are inserted into the equation below:

Vd = 3 * 60 = 180 (ft^3)

Example Problem #2:** **

For this problem, the variables needed are provided below:

duct cross-sectional area (ft^2) = 5

duct length (ft) = 40

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer.

Vd = CSA * L** = ?**