Primary Result
0.00 ft³
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Cubic Feet Calculator
Calculate volume for boxes, cylinders, and spheres with mixed-unit dimensions.
Converted Volumes
Cubic Yards: 0.00 yd³
Cubic Meters: 0.00 m³
US Gallons: 0.00 gal
The Ultimate Cubic Feet Calculator: Measure Any Space
Whether you are calculating freight shipping costs, ordering soil for a raised garden bed, sizing an air conditioning unit for a room, or pouring a concrete slab, knowing the exact volume of your space is non-negotiable.
Our comprehensive Cubic Feet Calculator instantly determines the three-dimensional volume of any common shape. By allowing you to mix and match units—like entering length in feet but depth in inches—this tool eliminates the tedious manual conversions that often lead to expensive ordering mistakes. Simply select your shape, plug in your dimensions, and get your exact cubic footage instantly.
How to Calculate Cubic Feet: Core Formulas
A "cubic foot" is a unit of volume representing the space inside a cube that measures exactly one foot long, one foot wide, and one foot high. To find the cubic footage of different spaces, you must use specific geometric formulas.
1. The Rectangular Prism (Boxes, Rooms, Slabs)
This is the most common calculation, used for shipping boxes, garden beds, and room volumes.
Volume = Length × Width × Height
2. The Cylinder (Pipes, Columns, Tanks)
Used for calculating the volume of water in a round tank or the concrete needed for a pillar.
Volume = π × Radius² × Height
The "Inches to Cubic Feet" Trap
The most common mistake people make when calculating cubic feet is forgetting to convert their initial measurements into feet before multiplying. If you measure a box that is 24 inches by 24 inches by 24 inches and multiply those numbers, you get 13,824. That is cubic inches, not cubic feet!
How to correctly handle inches:
- Method 1 (Convert First): Divide each inch measurement by 12 to get feet. Then multiply.
Example: (24 ÷ 12) × (24 ÷ 12) × (24 ÷ 12) = 2 ft × 2 ft × 2 ft = 8 cubic feet. - Method 2 (Convert Last): Multiply your inches together to get total cubic inches, then divide that massive number by 1,728 (because 12 × 12 × 12 = 1,728).
Example: 13,824 cubic inches ÷ 1,728 = 8 cubic feet.
Quick Conversion Reference Table
If you already know your total volume but need it in a different format for ordering materials or dealing with international shipping, use this quick conversion chart.
| To Convert From... | To Cubic Feet (ft³) | Mathematical Operation |
|---|---|---|
| Cubic Yards (yd³) | 1 yd³ = 27 ft³ | Multiply by 27 |
| Cubic Meters (m³) | 1 m³ ≈ 35.31 ft³ | Multiply by 35.3147 |
| Cubic Inches (in³) | 1728 in³ = 1 ft³ | Divide by 1,728 |
| US Gallons | 1 Gallon ≈ 0.133 ft³ | Divide by 7.48 |
Frequently Asked Questions
How many cubic feet are in a yard of dirt?
When landscaping companies refer to a "yard" of dirt, mulch, or gravel, they are actually talking about a cubic yard. There are exactly 27 cubic feet in one cubic yard (3 ft × 3 ft × 3 ft).
How do I calculate the cubic footage of a room for an AC unit?
To size an HVAC unit, you need the volume of the room. Measure the length and width of the floor, and multiply that by the ceiling height. For example, a 15-foot by 20-foot room with 8-foot ceilings has a volume of 2,400 cubic feet (15 × 20 × 8).
Is a cubic foot the same as a square foot?
No. A square foot is a two-dimensional measurement of flat area (Length × Width), used for things like flooring or painting. A cubic foot is a three-dimensional measurement of volume (Length × Width × Height), used for things that take up physical space, like concrete, water, or boxed freight.
How do you calculate cubic feet on a shipping pallet?
Measure the maximum length and width of the pallet base, and then measure from the ground to the absolute highest point of the stacked cargo. Multiply Length × Width × Height (in inches) and divide by 1,728 to give the freight carrier your exact cubic footage for LTL (Less Than Truckload) shipping quotes.
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