Cubic Feet Calculator
Your estimate
Cubic feet24 ft³0.89 yd³ · 0.68 m³
- Cubic yards
- 0.89 yd³24 ft³ · 0.68 m³
- Capacity
- 179.5 gal679.6 L
Boxes, rooms, freezers and round tanks — in feet and inches, with yards, gallons and litres.
Updated 2026-10-20 · Based on: exact NIST unit definitions.
How to use the Cubic Feet Calculator
- Pick box or cylinder.
- Enter the sizes (inches or feet).
- Use Quantity for several identical items.
Formula
Cubic feet = length × width × height in feet. From inches: multiply the three sizes and divide by 1,728 (12³).
Cylinder: π × (diameter ÷ 2)² × height.
Worked example
With the values preset in the calculator above: (Box)
- Length
- 4 ft
- Width
- 3 ft
- Height
- 2 ft
- Quantity
- 1
- Cubic feet
- 24 ft³ (0.89 yd³)
- Cubic yards
- 0.89 yd³ (24 ft³)
- Capacity
- 179.5 gal (679.6 L)
Cubic feet of common sizes
| Length (ft) | Width (ft) | Height (ft) | Cubic feet | Cubic yards |
|---|---|---|---|---|
| 1 | 1 | 1 | 1 ft³ | 0.04 yd³ |
| 2 | 2 | 2 | 8 ft³ | 0.3 yd³ |
| 4 | 2 | 1 | 8 ft³ | 0.3 yd³ |
| 4 | 4 | 4 | 64 ft³ | 2.37 yd³ |
| 8 | 4 | 4 | 128 ft³ | 4.74 yd³ |
| 10 | 10 | 8 | 800 ft³ | 29.63 yd³ |
Frequently asked questions
How do I calculate cubic feet from inches?
Multiply length × width × height in inches and divide by 1,728. A box 24 × 18 × 12 in is 3 ft³.
How many cubic feet is a 4 × 2 × 1 ft box?
8 ft³.
How many cubic feet in a cubic yard?
27.
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Estimates only — check quantities with your supplier and local building code before you order.