Cubic Feet Calculator
Enter the length, width, and height of your object or space. Choose your unit, then click Calculate Volume.
What is cubic feet?
Cubic feet is a unit of volume. It tells you how much space an object takes up in three dimensions: length, width, and height. If something is 1 foot long, 1 foot wide, and 1 foot tall, that space is exactly 1 cubic foot (1 ft³).
People use cubic feet for moving boxes, storage units, shipping estimates, refrigerators, freezers, aquariums, soil, gravel, concrete, and more. If you have dimensions, you can calculate volume quickly.
Formula to find cubic feet
Basic formula: Cubic Feet = Length × Width × Height (with all values in feet)
If your measurements are in inches, yards, centimeters, or meters, convert each dimension to feet first. This calculator does that conversion for you automatically.
Quick example
A box is 24 inches long, 18 inches wide, and 12 inches high:
- Convert to feet: 24 in = 2 ft, 18 in = 1.5 ft, 12 in = 1 ft
- Volume = 2 × 1.5 × 1 = 3 cubic feet
How to measure correctly
1) Length
Measure the longest side from one end to the other.
2) Width
Measure the shorter side perpendicular to the length.
3) Height
Measure from base to top. For a room, use floor to ceiling height.
4) Keep units consistent
Use the same unit for all three values. If you mix units accidentally, your volume will be inaccurate.
Common uses for a cubic feet calculator
- Moving: Estimate truck space needed for furniture and boxes.
- Storage units: Compare available storage volume with your items.
- Shipping: Calculate package volume for freight planning.
- Home improvement: Estimate fill material like mulch, sand, or gravel.
- Appliances: Understand internal capacity (fridges/freezers often listed in ft³).
Useful conversions
- 1 foot = 12 inches
- 1 yard = 3 feet
- 1 meter = 3.28084 feet
- 1 centimeter = 0.0328084 feet
- 1 cubic yard = 27 cubic feet
- 1 cubic meter = 35.3147 cubic feet
Real-world examples
Example 1: Storage bin
Dimensions: 3 ft × 2 ft × 1.5 ft
Volume = 3 × 2 × 1.5 = 9 ft³
Example 2: Room volume
Dimensions: 12 ft × 10 ft × 8 ft
Volume = 12 × 10 × 8 = 960 ft³
Example 3: Package in centimeters
Dimensions: 60 cm × 40 cm × 35 cm. Convert to feet (automatically in calculator), then multiply. Result is approximately 2.97 ft³.
Common mistakes to avoid
- Entering one dimension as zero or negative.
- Mixing units without converting.
- Using outside dimensions when inside capacity is needed (or vice versa).
- Rounding too early before final multiplication.
FAQ
Can I use decimals?
Yes. Decimals are supported and often necessary for accurate results.
What if I only know inches?
Select inches in the unit dropdown and enter your values directly.
Is this calculator for rectangular shapes only?
Yes, this tool assumes a rectangular prism (box-like shape). Irregular objects require different formulas or approximation methods.
Final thoughts
A reliable cubic feet calculator saves time and reduces guesswork. Whether you are planning a move, estimating materials, or comparing storage space, getting the volume right helps you make better decisions. Use the calculator above, verify your dimensions, and you will have accurate cubic feet in seconds.