Cubic Feet Calculator
Calculate cubic feet from room, box, area plus depth, or cylinder measurements.
This page keeps cubic feet as the main result and includes quick conversions to cubic yards, cubic inches, cubic meters, and US gallons.
Results
This is a quick cubic feet calculator for simple volumes. Use trade-specific calculators for concrete bags, gravel tons, water volume, or material cost.
How to use this calculator
- 01Choose box / room, area + depth, or cylinder.
- 02Enter the dimensions in feet and extra inches, or enter square feet for area + depth mode.
- 03Read cubic feet as the primary volume.
- 04Use the cubic yards, cubic inches, cubic meters, and US gallons rows when you need a quick conversion.
If you already know the surface area, the Square Footage Calculator can help with the area before you multiply by depth.
Understanding the math
Cubic feet measure volume. Convert extra inches to feet first, then use the volume formula for the selected shape.
box_volume = length x width x height area_depth_volume = square_feet x depth cylinder_volume = pi x (diameter / 2)^2 x height cubic_yards = cubic_feet / 27 cubic_inches = cubic_feet x 1728 cubic_meters = cubic_feet x 0.0283168466 us_gallons = cubic_feet x 7.48051948
Cubic feet conversion table
Use these common conversions as a quick check when you need cubic yards, cubic inches, m³, or gallons from a cubic-foot volume. For meter-first inputs, use the Cubic Meter Calculator. For yard-first material volume, use the Cubic Yard Calculator.
| Cubic feet | Cubic yards | Cubic inches | Cubic meters | US gallons |
|---|---|---|---|---|
| 1 cu ft | 0.037 cu yd | 1,728 cu in | 0.028 m³ | 7.48 gal |
| 10 cu ft | 0.37 cu yd | 17,280 cu in | 0.283 m³ | 74.81 gal |
| 27 cu ft | 1 cu yd | 46,656 cu in | 0.764 m³ | 201.97 gal |
| 100 cu ft | 3.7 cu yd | 172,800 cu in | 2.83 m³ | 748.05 gal |
| 1,000 cu ft | 37.04 cu yd | 1,728,000 cu in | 28.32 m³ | 7,480.52 gal |
Frequently asked questions
How to calculate cubic feet?
For a box or room, multiply length x width x height in feet. This calculator also handles area x depth and cylinders.
How to calculate cubic feet from inches?
Convert each inch measurement to feet by dividing by 12 before multiplying. If you already have cubic inches, divide by 1,728.
How to calculate cubic feet from square feet?
Multiply square footage by depth in feet. For example, 120 sq ft at 0.5 ft deep is 60 cu ft.
How to calculate cubic feet of a cylinder?
Use pi x radius squared x height, with radius and height in feet. If you measured diameter, divide it by 2 first.
How to calculate gallons from cubic feet?
Multiply cubic feet by 7.48051948 to estimate US gallons.
Related calculators
Square Footage Calculator
Calculate square footage first when you already know the surface area for an area-and-depth volume.
Square Meter Calculator
Calculate metric-first area in square meters with quick square-foot conversion.
Cubic Meter Calculator
Calculate metric-first volume in cubic meters with quick cubic-foot conversion.
Cubic Yard Calculator
Calculate material volume in cubic yards from area and depth or dimensions.
Concrete Calculator
Estimate concrete cubic yards, bags, and weight for slabs, footings, and walls.
Gravel Calculator
Estimate gravel cubic yards, tons, bags, and cost from area and depth.