Box Volume Calculator

Find a box’s volume, surface area and diagonal from length, width and height.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator takes a rectangular box's length, width and height and computes its volume (length × width × height), surface area (the sum of all six rectangular faces), and space diagonal — the longest straight line that fits inside the box, corner to corner.

It's used for real-world packing and shipping problems: checking whether an item fits inside a box by comparing its length to the box's diagonal, estimating how much a shipping container or storage bin can hold, and calculating how much cardboard, wrapping paper or material is needed to cover a box's surface. It's also a standard geometry problem for students working through volume and surface area of rectangular solids.

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