Cubic Feet Calculator
Compute cubic feet from length, width and height in feet, inches or meters, or convert cubic meters, yards, liters and gallons into cubic feet.
Results
Cubic feet
- Cubic yards
- 11.8519 yd³
- Cubic meters
- 9.0614 m³
You might also need
Educational estimates · not financial advice · free, no signup
Formula / how it works
Box volume = L × W × H. 1 m³ ≈ 35.3147 ft³; 1 yd³ = 27 ft³.
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
Cubic feet measure volume in the US customary system and appear on appliance specifications, storage and freight quotes, soil and mulch orders and room-sizing guides. This calculator works two ways: it multiplies length, width and height to get the volume of a box, or it converts a volume from cubic meters, cubic yards, liters or US gallons into cubic feet. It also shows the same volume in cubic yards and cubic meters. Use it for refrigerators, moving boxes, trailers, planters and rooms. The box mode assumes a rectangular shape, so irregular spaces need to be split into simple boxes.
When to use / who it helps
- You need the volume of a box, crate, shed or room in cubic feet.
- A spec lists capacity in cubic meters or liters and you want cubic feet.
- You are comparing storage units, refrigerators or trailers.
- You are ordering soil or gravel that is sold by the cubic yard.
- You want to check a freight quote based on volume.
How to use
Steps
- Choose Box to multiply dimensions, or Convert units to change an existing volume.
- For a box, enter length, width and height.
- Select whether the dimensions are in feet, inches or meters.
- For conversion, enter the volume and choose the unit you are converting from.
- Read the cubic feet, then the cubic yards and cubic meters.
- Add the volumes of several boxes if the space is irregular.
How to interpret results
- The primary result is in cubic feet; the other two lines are the same volume in other units.
- Dividing cubic feet by 27 gives cubic yards, the unit used for bulk materials.
- Volume grows with the cube of length, so doubling every dimension multiplies the volume by eight.
- Internal capacity can be lower than the outside volume once wall thickness is considered.
- Rounding the dimensions first can produce a visible error in the product.
Common mistakes & gotchas
- Entering dimensions in inches while the unit is set to feet.
- Using external dimensions when you need internal capacity.
- Converting inches to cubic feet by dividing by 12 instead of 1,728.
- Confusing cubic feet with square feet.
- Forgetting to convert yards to feet when mixing units.
Worked example
Worked example — a 10 ft × 8 ft × 4 ft box, and 2 cubic yards
- Multiply the dimensions: 10 × 8 × 4 = 320 ft³.
- Cubic yards: 320 ÷ 27 ≈ 11.85 yd³.
- Cubic meters: 320 × 0.0283168 ≈ 9.06 m³.
- Convert 2 yd³ to cubic feet: 2 × 27 = 54 ft³.
Result: A 10 × 8 × 4 ft box holds 320 cubic feet, about 11.85 cubic yards or 9.06 cubic meters.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
Box volume = L × W × H. 1 m³ ≈ 35.3147 ft³; 1 yd³ = 27 ft³.
Frequently asked questions
How do I calculate cubic feet?
Multiply length, width and height in feet. If measurements are in inches, convert to feet first or divide the cubic inches by 1,728.
How many cubic feet are in a cubic yard?
27.
How many cubic feet are in a cubic meter?
About 35.3147.
How do I convert liters to cubic feet?
Multiply liters by 0.0353147.
Is cubic feet the same as square feet?
No. Square feet measure area; cubic feet measure volume.
How do I measure an irregular space?
Divide it into rectangular sections, compute each volume, and add them.