Cuboid Volume Calculator
Boxes, rooms and tanks are all cuboids. Enter the length, width and height in the same unit to get the volume, surface areas and space diagonal instantly, with every calculation running right in your browser.
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How to use
- Enter the cuboid's length, width and height in the same unit.
- Volume, surface areas and the space diagonal will show instantly.
- Change any edge to see how the volume responds before you commit.
- Use the results for room, box or tank measurements before buying materials.
Tips
- Measure all three edges in the same unit before entering them.
- The space diagonal is the longest straight line that fits inside the box - handy for moving furniture.
- Surface area tells you the wrapping or paint needed; volume tells you the capacity.
- For a room, subtract doors and windows from the wall area before buying paint.
Note: If you enter dimensions in feet, the volume comes in cubic feet — for liters, multiply cubic feet by 28.3168 (the water tank calculator does this by itself).