How this calculator works
Volume = length × width × height. The result is converted from the selected input unit.
Using this result
Volume tells you how much three-dimensional space a rectangular box contains or occupies.
Next step: Use internal measurements for product capacity and sealed outer measurements for shipping-space decisions.
Worked example
A 40 × 30 × 20 cm box contains 24,000 cm³, equal to 24 liters or 0.024 m³.
How to measure
- Use internal dimensions for product capacity.
- Use external dimensions for freight space.
- Keep all three inputs in the same unit.
Common mistakes
- Mixing internal and external dimensions.
- Mixing inches and centimeters.
- Confusing liters with cubic meters.
Planning note: This result is an estimate, not a carrier quote. Equipment, services, limits and rounding rules can vary. Confirm operational decisions with the relevant provider.
Formula implementation and worked example reviewed September 9, 2026. See the methodology and sources.