Attic Volume Calculator
Do you want to calculate the volume of your attic? The Attic Volume Calculator is a helpful tool, just enter the dimensions attic width, height and length of your attic into the input fields of the calculator, it will quickly find out how much space is available.
How Does this Calculator Help?
This calculator helps users determine the storage capacity or the amount of insulation needed for an attic. By knowing the volume, you can better plan your space and materials.
Calculator – User Guide

Basic Calculator:
 Enter any two values: Attic Width (ft), Attic Height (ft), Attic Length (ft), or Attic Volume (ft³).
 Leave one field empty.
 Click the “Calculate” button to get the missing value.

Advanced Calculator:
 Enter the Attic Width (ft), Attic Height (ft), Attic Length (ft), and Insulation Thickness (in).
 Click the “Calculate” button to get the Adjusted Attic Volume (ft³).
Attic Volume Formula
The formula to calculate Attic Volume is:
$AV = W \times H \times L \times 0.5$
Variables:
AV  $$
is the Attic Volume (ft³) 
W 
is the attic width (ft) 
H 
is the attic height (ft) 
L  $$
is the attic length (ft) 
Attic Volume Calculations Examples
1. Basic Example
Attic Width (ft)  Attic Height (ft)  Attic Length (ft)  Attic Volume (ft³) 

20  10  30  3000 
Given:
 Width = 20 ft
 Height = 10 ft
 Length = 30 ft
Using the formula:
$AV = 20 \times 10 \times 30 \times 0.5 = 3000 \, \text{ft}^3$
2. Advanced Example
Attic Width (ft)  Attic Height (ft)  Attic Length (ft)  Insulation Thickness (in)  Adjusted Attic Volume (ft³) 

20  10  30  12  2900 
Given:
 Width = 20 ft
 Height = 10 ft
 Length = 30 ft
 Insulation = 12 in
Using the formula:
$AV = 20 \times 10 \times 30 \times 0.5 = 3000 \, \text{ft}^3$
$\text{Adjusted Volume} = 3000 – \left( \frac{20 \times 30 \times 12}{12} \right) = 3000 – 100 = 2900 \, \text{ft}^3$
FAQs
What is the attic volume?
The attic volume represents the space in the attic, generally measured in cubic feet. This allows you to understand your storage capacity and insulation needs.
What if I know only the dimensions of the attic?
Calculate volume using an Attic Volume Calculator: Enter the known dimensions, leaving result of the fields blank, and click on Calculate.
Can I include the thickness of the insulation for the volume calculation?
Yes, with that sophisticated calculator, you can subtract the space taken by the insulation from the total volume.
I hope this helped you for calculating attic space. This calculator ensures you get accurate measurements for your attic projects. Please let me if you have any question related to this tool in the comment section.