Private production calculator
Box Volume Calculator
Compare packaging capacity and shipping volume. Results update instantly.
More file tasks
Measure a box correctly, calculate litres or cubic feet, and understand why carrier dimensional weight uses external dimensions rather than internal capacity.
How it works
A useful answer,
with the math visible.
Convert internal box dimensions into litres, cubic inches, cubic feet and dimensional shipping weight. Adjust the fields above and the result updates immediately—there is no upload, account or hidden processing step.
Worked example
A 12 × 9 × 4 in box holds 432 in³ (about 7.08 L).
How to use the Box Volume Calculator
- Select your dimension unit (inches or centimetres).
- Enter your box internal length, width and height.
- Set your carrier's dimensional weight divisor.
- Review the capacity in litres and volume in cubic inches.
- Check the dimensional weight for shipping calculations.
- Compare with product dimensions for fit testing.
What happens under the hood
This calculator computes volume by multiplying length × width × height, then converts between cubic inches and litres using the standard 61.0237 conversion factor. For dimensional weight, it divides cubic inches by your selected divisor (common values: 139 for USPS, 166 for FedEx Ground). All calculations occur instantly in your browser with no server processing. The tool helps you balance packaging size with shipping costs.
Before you send the file
- Use internal dimensions for capacity and external dimensions for carrier billing.
- Dimensional-weight divisors differ by carrier, service and region.
- This tool does not check product fit, cushioning or compression strength.
Frequently asked questions
What's the difference between internal and external dimensions?
Internal dimensions measure the usable space inside the box, while external includes box material thickness. Use internal for capacity calculations and external for carrier billing and shipping costs.
What divisor should I use for shipping?
Divisors vary by carrier and service. Common values: USPS 139, FedEx Ground 166, UPS 139. Check your carrier's current dimensional weight policy for accurate calculations.
How do I measure box dimensions accurately?
For internal dimensions, measure the inside space. For external, measure the outer edges. Use a ruler or measuring tape, and round to the nearest tenth for consistent results.
Can this help with product fit?
While it shows box capacity, it doesn't account for product shape, cushioning, or arrangement. For complex products, create a physical prototype or use 3D modeling software for accurate fit testing.
This calculator is a planning aid. Materials, equipment and supplier tolerances vary, so verify final specifications with the printer or carrier responsible for production.