How to calculate cubic feet
- Feet: length × width × height = cubic feet.
- Inches: length × width × height ÷ 1,728 (12 × 12 × 12).
- Mixed: convert everything to feet first — 8 inches is 0.667 ft.
- Cylinder: 3.1416 × radius² × height (all in feet).
- Centimeters: L × W × H ÷ 28,317 (cm³ per ft³).
cubic feet = L (in) × W (in) × H (in) ÷ 1,728
Cubic feet of common boxes
| Item | Size (in) | Cubic feet | Liters |
|---|---|---|---|
| Small moving box | 16 × 12 × 12 | 1.33 | 38 |
| Medium moving box | 18 × 18 × 16 | 3 | 85 |
| Large moving box | 18 × 18 × 24 | 4.5 | 127 |
| Carry-on suitcase | 22 × 14 × 9 | 1.6 | 45 |
| Standard bathtub (interior) | 54 × 24 × 14 | 10.5 | 297 |
Cubic feet conversions
| 1 cubic foot equals | |
|---|---|
| Cubic inches | 1,728 |
| Cubic yards | 0.037 (1/27) |
| US gallons | 7.48 |
| Liters | 28.32 |
| Cubic meters | 0.0283 |
FAQ
How do I find the cubic feet of a room?
Multiply floor length × width × ceiling height in feet. A 12 × 14 ft room with 8 ft ceilings is 1,344 cubic feet.
How many gallons are in a cubic foot?
7.48 US gallons. A tank of 10 cubic feet holds about 75 gallons.
How many cubic feet are in a yard?
27. Bagged mulch and soil are sold in cubic feet, bulk material in cubic yards — the cubic yard calculator converts between them.