Cubic Feet Calculator
Cubic feet measure volume — multiply length × width × height (all in feet) to get cubic feet, then convert to cubic yards, cubic meters or gallons. For a slab or bed, set the height to your depth.
Your measurements
ft
ft
ft
Dimensions
- Floor area
- 100 ft²
- Height
- 8 ft
Cubic feet
800 ft³
Conversions
- Cubic yards
- 29.63 yd³
- Cubic meters
- 22.65 m³
- Gallons (US)
- 5,984.42 gal
Estimates only. Order a little extra for waste and verify against your supplier's coverage figures.
Footprint
Footprint to scale
The formula
Cubic feet = Length ft × Width ft × Height ft
Example: A 10 ft × 10 ft room 8 ft tall = 800 ft³ = 29.63 yd³.
How it works
- 1Measure length, width and height in feet (convert inches by dividing by 12).
- 2Multiply length × width × height to get cubic feet.
- 3Divide by 27 for cubic yards, or multiply by 7.48 for US gallons.
Frequently asked questions
How do I calculate cubic feet from inches?
Convert each measurement to feet first by dividing by 12, then multiply length × width × height. Or multiply the three inch measurements together and divide by 1,728 (that's 12³).
How many cubic feet are in a cubic yard?
27. A cubic yard is 3 ft × 3 ft × 3 ft = 27 cubic feet.