Rectangular Cuboid Calculator

The Rectangular Cuboid Calculator works out the volume, surface area and diagonal of a box from its length, width and height. Enter the three dimensions and the results appear instantly. It is perfect for packaging design, storage planning and geometry homework.

How to use this tool

1. Enter the length, width and height.
2. Click calculate to get the volume, surface area and diagonal.
3. Results are displayed instantly.
4. Copy the values you need for your project.

When to use this tool

• Designing boxes and packaging for products.
• Planning storage space in warehouses or shipping containers.
• Solving geometry problems involving rectangular prisms.
• Estimating material needed to wrap or paint a box.

Practical examples

A box measuring 10 by 8 by 5 units has a volume of 400 cubic units and a surface area of 340 square units. Entering 10, 8 and 5 returns both values, which a packaging designer can use to compare material costs.

Tips for accurate results

• Use the same unit for all three dimensions.
• Round results to a precision that suits your manufacturing tolerance.
• Check that dimensions are positive numbers before calculating.

Frequently asked questions

What does the cuboid calculator return?

It returns the volume, total surface area and space diagonal of the rectangular cuboid.

Which formula is used for volume?

Volume equals length times width times height.

Can it handle decimal dimensions?

Yes, enter decimal values and the calculator handles them directly.