Cubic Feet Calculator

How to Calculate Cubic Feet

Cubic footage is the volume of a space measured in feet. Knowing the cubic footage of an object or space is often necessary for shipping, freight, landscaping projects, and even when selecting a refrigerator or microwave.

The first step to finding the volume of an object or space in cubic feet is to measure the length, width, and height of a space or item.

Then, if the measurements were recorded using a different unit of length, convert them to feet.

Finally, apply the volume formula below to calculate the cubic footage.

Cubic Footage Formula

To find the volume in cubic feet, multiply the three measurements in feet together. The volume formula looks like this:

For example, let’s calculate the cubic footage of a 10×20 storage unit that measures 20 feet long by 10 feet wide, and is 8 feet high.

This calculator supports calculating the volume of a cube or rectangle; check out our volume calculator to find the volume of even more shapes.

How to Calculate Cubic Footage Using Dimensions in Inches

If your measurements are in inches, then you can enter the inch measurements into the volume formula above and solve to find the volume in cubic inches.

Then, convert the volume in cubic inches to cubic feet by dividing the volume by 1,728.[1] The number 1,728 comes from the fact that you have to divide by 12 inches per foot three times, one for each dimension.

Therefore, to obtain the volume in cubic feet, you can either divide the volume, in cubic inches, by 12 three times, or just divide it by 1,728, which is equal to 123.

How to Find Cubic Feet Using Square Feet

Given the area of a space, it’s possible to find the volume in cubic feet if its height is also known. The formula for volume using area and height is:

The volume is equal to the area times the height.

Since square footage is a measure of area, you can simply multiply the area in square feet times the height in feet to find the cubic footage.