Rectangular prism (box) Volume Calculator
Base area times height. Boxes, rooms, aquariums, raised beds and concrete slabs are all rectangular prisms.
V = l × w × h
Volume of the rectangular prism (box)
120ft³
- Surface area
- 164 ft²
- V = 10 × 4 × 3 = 120 ft³
- SA = 2(40 + 30 + 12) = 164 ft²
Volume in other units
| m³ | 3.398 |
| liters | 3,398.02 |
| ft³ | 120 |
| yd³ | 4.4444 |
| in³ | 207,360 |
| US gallons | 897.662 |
| cm³ (mL) | 3,398,020 |
How to find the volume of a rectangular prism
Volume: V = l × w × h. Surface area: SA = 2(lw + lh + wh).
- Measure in one unit. The answer comes out in that unit cubed (ft³, m³).
- Substitute into the formula; the calculator shows the steps with your numbers.
- Read liters, gallons, cubic yards and more in the conversion table. 1 ft³ ≈ 7.48 US gallons ≈ 28.32 liters.
Questions people ask
How do I find the volume of a room?
Multiply floor length × width × ceiling height. A 12 × 10 ft room with 8 ft ceilings holds 960 ft³ of air.
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Paste a homework question or describe your project. The AI tutor names the formula and works it through step by step. Always check the result with the calculator above.
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