Box Volume Calculator
Multiply the three edges for volume, then divide by 1,000 for litres. The diagonal is the longest straight object that will fit inside.
Your numbers
Volume
9,000cm³
Litres
9L
Diagonal
39.05cm
Formula
Volume = Length × Width × Height
Couriers compute volumetric weight as length × width × height in cm divided by 5,000 or 6,000 — the divisor varies by carrier.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Length (cm)The measurement across, side to side. | 30 | 0 and up |
| Width (cm)The measurement front to back. | 20 | 0 and up |
| Height (cm)The perpendicular height from the base — not the slanted side. | 15 | 0 and up |
Step by step
Quick reference table
Results when only Length (cm) changes and everything else stays put.
| Length (cm) | Volume (cm³) | Litres (L) | Diagonal (cm) |
|---|---|---|---|
| 15 | 4,500 | 4.5 | 29.15 |
| 22.5 | 6,750 | 6.75 | 33.63 |
| 30 | 9,000 | 9 | 39.05 |
| 45 | 13,500 | 13.5 | 51.48 |
| 60 | 18,000 | 18 | 65 |
What each result means
| Result | At default values |
|---|---|
| Volume (cm³)The space a solid holds — length cubed. | 9,000 |
| Litres (L)Capacity in litres; one litre is 1,000 cm³. | 9 |
| Diagonal (cm)Corner to opposite corner. | 39.05 |
Common mistakes
Couriers compute volumetric weight as length × width × height in cm divided by 5,000 or 6,000 — the divisor varies by carrier.
Glossary
- Length
- The measurement across, side to side.
- Width
- The measurement front to back.
- Height
- The perpendicular height from the base — not the slanted side.
- Volume
- The space a solid holds — length cubed.
- Litres
- Capacity in litres; one litre is 1,000 cm³.
- Diagonal
- Corner to opposite corner.
Frequently asked questions
Q. How is Box Volume Calculator calculated?
Volume = Length × Width × Height — Multiply the three edges for volume, then divide by 1,000 for litres. The diagonal is the longest straight object that will fit inside.
Q. Can you walk through an example?
With Length 30cm, Width 20cm, Height 15cm, the answer is Volume 9,000cm³.
Q. What do I need to enter?
Enter Length, Width, Height. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Length (cm) moves the answer to Length (cm) 15 → Volume (cm³) 4,500 and Length (cm) 60 → Volume (cm³) 18,000. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Couriers compute volumetric weight as length × width × height in cm divided by 5,000 or 6,000 — the divisor varies by carrier.
Related calculators
Keep your length units consistent across inputs — mixing centimetres and metres throws results far off.