Volume calculator

Rectangular box volume = length × width × height. Surface area = 2 × (length × width + length × height + width × height).

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Length

Width

More inputs and assumptions

Height

Answer

…

Rectangular box volume = length × width × height. Surface area = 2 × (length × width + length × height + width × height).

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Use one unit for all three dimensions. Volume uses that unit cubed. For capacity, measure internal dimensions rather than outer dimensions.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Volume calculator

Rectangular box volume = length × width × height. Surface area = 2 × (length × width + length × height + width × height).

Use one unit for all three dimensions. Volume uses that unit cubed. For capacity, measure internal dimensions rather than outer dimensions.

Next: Pipe volume calculator

A worked example

With length = 4, width = 3, height = 2, the box volume is 24.

Next: Cylinder volume calculator

Next: Gravel calculator

Before you use the result

Use one unit for all three dimensions. Volume uses that unit cubed. For capacity, measure internal dimensions rather than outer dimensions.

Example results for length

These examples use Width: 3; Height: 2. They are reference calculations, not recommended settings.

Length	Box volume
2	12
4	24
8	48

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