Volume Calculator — Rex's Toolbox

Rex says

The fast lane for the math you almost remember from school. Type the numbers, get the answer, move on with your day.

Try a scenario

Click to load — tweak from there.

Inputs

Shape

Dim 1 (length / radius)

Dim 2 (width / height, sphere ignores)

Dim 3 (height for box)

Result

Volume

30.0000

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How to use this

1Enter shape.
2Enter dim 1 (length / radius).
3Enter dim 2 (width / height, sphere ignores).
4Enter dim 3 (height for box).
5Read your volume on the right — it updates as you type.
6Hit Share to keep the scenario or send it to someone.

About this calculator

Computes volume for the three most common 3-D shapes.

Worked example

Using the values the calculator loads with:

Inputs

Shape: Rectangular box
Dim 1 (length / radius): 5
Dim 2 (width / height, sphere ignores): 3
Dim 3 (height for box): 2

Results

Volume: 30

What each field means

Inputs

Shape: Pick the option that matches your situation — the maths changes per option. Choices: Rectangular box, Cylinder, Sphere.
Dim 1 (length / radius): The dim 1 (length / radius) used in the calculation. Starts at 5 so you have a working example on load.
Dim 2 (width / height, sphere ignores): The dim 2 (width / height, sphere ignores) used in the calculation. Starts at 3 so you have a working example on load.
Dim 3 (height for box): The dim 3 (height for box) used in the calculation. Starts at 2 so you have a working example on load.

Results

Volume: Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.

FAQ

How does the volume calculator work?

Computes volume for the three most common 3-D shapes.

What do I need to enter?

4 values: shape, dim 1 (length / radius), dim 2 (width / height, sphere ignores), and dim 3 (height for box). Each field starts with a sensible default, so you can change one number at a time and watch the result move.

What does the volume result mean?

It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.

Is this calculator free, and do I need an account?

Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.

How accurate is the result?

It applies the standard formula exactly, so the arithmetic is precise. Results are rounded for display; the underlying calculation keeps full precision.

Who is this tool for?

It's built for students, developers, and anyone who needs the answer right now without setting up a spreadsheet.

Accuracy and limitations

Results are rounded for display; the underlying calculation keeps full precision.
Very large or very small inputs may hit floating-point limits in the browser.
Inputs outside the accepted range are clamped rather than rejected.

Related tools

Area Calculator

Area of a rectangle, triangle, or circle.

Cite this calculator

Writing about this topic? Grab a citation — every link helps keep these tools free.

APA

RevenueLab. (2026). Volume Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/volume

HTML

<p>Source: <a href="https://www.revenuelab.fyi/toolbox/volume" target="_blank" rel="noopener">Volume Calculator — RevenueLab</a> (2026).</p>

Markdown

Source: [Volume Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/volume) (2026).