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Volume Calculator

Volume of any 3D shape and conversion between volume units.

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Shape

—

Fill and weight

Useful for tanks, ponds and aquariums.

Water is 1.0, petrol about 0.75, concrete about 2.4.

Volume at fill level—
Contents weight—

Mind the gallon

A US gallon is 3.785 litres, an imperial gallon 4.546 — about 20% larger. They are listed separately so a conversion never silently uses the wrong one.

Quick Tool Overview

The Volume Calculator finds the volume of the standard solids — box, cube, cylinder, sphere, cone, pyramid and capsule — with the formula shown next to each result, and converts between metric, US and imperial volume units.

What it does
Calculates volume for 3D shapes and converts volume units
You give it
A shape and its dimensions, or a volume to convert
You get back
The volume with its formula, plus every unit conversion
Best for
Tanks, pools, concrete, shipping, cooking and fuel
Calculators Free, unlimited use No sign-up Runs in your browser

About the Volume Calculator

Calculate the volume of the standard solids — rectangular box, cube, cylinder, sphere, cone, pyramid and capsule — with the formula shown next to each result so the working is visible.

The unit converter beneath moves between litres, millilitres, cubic metres, cubic centimetres, cubic feet and inches, and both US and imperial gallons, pints and fluid ounces. Keeping the US and imperial measures separate matters: a US gallon is 3.785 litres and an imperial gallon is 4.546, so a recipe or a fuel figure converted with the wrong one is out by a fifth.

Key features of the Volume Calculator

Seven solids

Rectangular box, cube, cylinder, sphere, cone, pyramid and capsule.

Formula beside every result

The working is visible, so the page doubles as a reference.

US and imperial kept separate

A US gallon is 3.785 litres and an imperial gallon is 4.546, so a recipe or fuel figure converted with the wrong one is out by a fifth.

Full unit range

Litres, millilitres, cubic metres and centimetres, cubic feet and inches, plus gallons, pints and fluid ounces.

Practical shapes included

The capsule covers propane tanks and rounded vessels that a plain cylinder gets wrong.

How to use the Volume Calculator

  1. 1

    Choose a shape

    Pick the solid you are measuring and the required dimensions appear.

  2. 2

    Enter the dimensions

    Type them in any supported unit and the volume is calculated instantly.

  3. 3

    Convert the result

    The volume is shown in litres, cubic metres, gallons and more at the same time.

Frequently asked questions

Multiply pi by the radius squared, then by the height. A cylinder 1 metre across and 2 metres tall has a radius of 0.5, so the volume is pi x 0.25 x 2, about 1.571 cubic metres.

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