With this cubic feet calculator, youll quickly find out the volume in square feet. It may help you estimate the volume of a cuboid container, as well as the amount of material required to finish your desired earthworks — for example, calculating cubic feet of soil, sand, or gravel. In the paragraphs below, you can read about how to calculate cubic feet from inches or from your favorite length unit. Wait no longer: scroll down, read on, and never worry about cubic feet calculations again!
If you need, you can quickly convert any volume to cubic yards with our cubic yard calculator.
Calculating cubic feet is a useful skill for shipping, construction, remodeling, and more While it may seem complicated at first, calculating cubic feet is actually quite simple if you know the basic formulas. In this article, I’ll explain stepbystep how to find the cubic feet of any object or space
What is a Cubic Foot?
A cubic foot is a unit of volume equal to a cube with sides of 1 foot. One cubic foot equals 12 inches x 12 inches x 12 inches, or 1728 cubic inches.
In visual terms, a standard refrigerator box is about 1 cubic foot in size. Knowing cubic feet measurements allows you to estimate shipping costs, material quantities needed for construction or landscaping, or the capacity of containers and spaces.
Finding Cubic Feet Using Length, Width & Height
The basic formula for cubic feet is:
Cubic Feet = Length x Width x Height
All measurements must be in feet.
For example, to find the cubic feet of a storage unit that is 10 ft long x 8 ft wide x 6 ft high you would calculate
10 ft x 8 ft x 6 ft = 480 cubic feet
Therefore, this storage unit has a capacity of 480 cubic feet.
This straightforward cubic feet calculation works for any regularly shaped object where you can measure the length, width, and height.
Measuring Irregularly Shaped Objects
For irregular shapes like curved furniture, oddshaped containers, or unique spaces, you’ll need to break the object down into regular shapes like cubes, rectangles, triangles, and cylinders.
Measure and calculate the cubic feet of each component shape separately, then add them together to get the total cubic feet.
For example, say you want to find the cubic feet of an Lshaped desk:
 The main desk section is 4 ft x 3 ft x 2 ft = 24 cubic feet
 The return section is 2 ft x 3 ft x 2 ft = 12 cubic feet
 Total cubic feet = 24 + 12 = 36 cubic feet
Breaking down irregular objects makes it possible to calculate the cubic feet accurately.
Converting Inches or Meters to Cubic Feet
If you don’t have measurements in feet, you’ll need to convert to feet first before using the cubic feet formula.

For inches: multiply length x width x height in inches first to get cubic inches. Then divide the cubic inches by 1728 to convert to cubic feet.

For centimeters: multiply length x width x height in cm first to get cubic cm. Divide the cubic cm by 28317 to convert to cubic feet.

For meters: multiply length x width x height in meters first to get cubic meters. Multiply the cubic meters by 35.3145 to convert to cubic feet.
Let’s see an example. Say a package measures 12 in x 8 in x 5 in:
 12 in x 8 in x 5 in = 480 cubic inches
 480 cubic inches / 1728 = 0.28 cubic feet
So if a package has interior dimensions of 12″ x 8″ x 5″, it would have a volume of 0.28 cubic feet.
Calculating Cubic Feet from Square Footage
If you know the square footage of a floor or other flat surface, you can find the cubic feet if you also know the height.
Use this simple formula:
Cubic feet = Area (square feet) x Height (feet)
For instance, say you have a shed that is 100 square feet in area (10 ft x 10 ft) and the walls are 8 ft high.
To find the cubic feet:
 Area = 100 sq ft
 Height = 8 ft
 Cubic Feet = 100 sq ft x 8 ft = 800 cubic feet
This shed would have an interior capacity of 800 cubic feet.
Finding the Volume of Cylinders
For cylindrical objects like pipes, drums, or silos, you need to use a different formula:
Cubic Feet = (π x Radius2 x Height) / 1728
The radius is half the diameter. π is approximately 3.14.
Let’s calculate the cubic feet of a water storage tank that is 10 feet high with a diameter of 5 feet:
 Radius = Diameter / 2 = 5 ft / 2 = 2.5 ft
 π = 3.14
 Cubic Feet = (3.14 x 2.52 x 10) / 1728 = 98.2 cubic feet
So this cylindrical tank would hold about 98 cubic feet of water.
RealWorld Examples
Here are a few realworld examples to illustrate how cubic feet calculations are useful:

Estimating mulch needs – Say you need to cover a 10 ft x 20 ft flowerbed with 3 inches of mulch. Since mulch depth is usually measured in feet, convert 3 inches to 0.25 ft. Then use the area x height formula:
 Area = 10 ft x 20 ft = 200 sq ft
 Height = 0.25 ft
 Cubic Feet = 200 sq ft x 0.25 ft = 50 cubic feet

Ordering gravel – You need 11 cubic yards of gravel delivered for a landscaping project. Convert cubic yards to cubic feet by multiplying by 27 (since there are 27 cubic feet in a cubic yard).
 11 cubic yards x 27 = 297 cubic feet of gravel needed.

Shipping costs – You sold a desk on eBay that is 4 ft long x 3 ft wide x 2 ft tall. Calculate cubic feet to estimate shipping costs:
 4 ft x 3 ft x 2 ft = 24 cubic feet
 Check shipping quotes based on a package with dimensions of 24 cubic feet.

Moving truck rental – You’re moving across the country and need to estimate the size of truck you need. Calculate the total cubic feet of your furniture:
 Couch – 8 ft x 3 ft x 2 ft = 48 cu ft
 Bed – 5 ft x 6 ft x 2 ft = 60 cu ft
 Desk – 4 ft x 3 ft x 2 ft = 24 cu ft
 Total cubic feet of furniture = 132 cubic feet
 Rent a truck with at least 150 cubic feet of cargo space.
As you can see, knowing how to quickly calculate cubic feet comes in very handy for all kinds of everyday situations!
Cubic Feet Formulas Cheat Sheet
Here is a quick summary of the important cubic feet formulas covered in this article:
 Basic Volume – Cubic Feet = Length x Width x Height
 Square Footage – Cubic Feet = Area (sq ft) x Height
 Cylinder Volume – Cubic Feet = (π x Radius2 x Height) / 1728
 Inches to Cubic Feet – Cubic Feet = Cubic Inches / 1728
 Cm to Cubic Feet – Cubic Feet = Cubic Cm / 28317
 Meters to Cubic Feet – Cubic Feet = Cubic Meters x 35.3145
Cubic Feet Calculator
To make these cubic feet calculations even easier, use a cubic feet calculator that allows you to input dimensions in feet, inches, yards, meters, etc.
The calculator will handle all the conversions and formulas automatically. Here are two good online cubic feet calculators:
Just enter the required dimensions and the calculator will output the cubic feet measurement.
Knowing how to find cubic feet quickly comes in handy for so many everyday situations from shipping packages to remodeling projects. Next time you need to calculate interior volumes or material quantities, use this stepbystep guide to determine the cubic feet accurately. Our cheat sheet gives you all the formulas you need, or use a cubic feet calculator for convenience.
And how to calculate cubic feet from inches?
But what do we do if the dimensions are expressed in units other than feet — like yards, inches, or even centimeters and meters? Well, you need to convert them. There are two ways of doing this — either you convert the units before the volume calculation or after:
 Convert the dimensions into feet. Assuming that our length, width, and height are in:
 Inches — you need to divide each value by 121212.
 Yards — multiply each value by 333.
 Centimeters — divide each value by 30.4830.4830.48.
 Meters — multiply each value by 3.2813.2813.281.
After converting the units, youll have all of the dimensions in feet, so a simple multiplication will give us the result in cubic feet.
 Convert the volume directly to cubic feet unit. You may find this method easier, as you only need to divide or multiply once:
 Inches — divide the volume value by 1, 7281,!7281,728 (because its 12312^3123).
 Yards — multiply the volume value by 272727 (which is 333^333).
 Centimeters — divide the volume value by 28, 316.84728,!316.84728,316.847 (which is 30.48330.48^330.483).
 Meters — multiply the volume value by 35.31535.31535.315 (which is 3.28133.281^33.2813).
If you are dealing with a different unit for each dimension, we recommend using the first method to avoid miscalculations. Or even better, you can use our cubic feet calculator and forget about tricky unit conversions!
How to calculate cubic feet?
“Calculating cubic feet” is a simplified way of saying that we need to find the volume of an object in cubic feet. One cubic foot is a volume that fills a 1 ft×1 ft×1 ft1 text{ft} times 1 text{ft} times 1 text{ft}1 ft×1 ft×1 ft cubic container.
So, if you want to calculate the volume of a boxshaped object, the formula for volume looks as follows:
If all your dimensions are in feet, then the volume you obtain is in cubic feet.
Calculating volume is useful in many different situations in everyday life, for example:
 If you want to estimate the volume of your fridge, dishwasher, or oven.
 If youre curious about how much space your suitcase takes up, so youll know if it fits in your trunk.
 If youre wondering how much sand will fit into a rectangular sandbox or how much gravel your driveway needs.
 How much water will fill up your aquarium or pool(although gallons are used more often than cubic feet in those cases).