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Aquarium volume calculator

Compute the water volume of a rectangular aquarium in litres and gallons.

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Enter Length (cm), Width (cm), Height (cm) and the Aquarium volume calculator works out Volume (litres), Volume (US gallons) straight away. For instance, with Length (cm) = 60, Width (cm) = 30 and Height (cm) = 40 it returns Volume (litres) = 72 and Volume (US gallons) = 19.02.

How to use it

  1. Enter your values: Length (cm), Width (cm), Height (cm).
  2. Read the result instantly: Volume (litres), Volume (US gallons).

Frequently asked questions

What does the Aquarium volume calculator actually compute?

It takes Length (cm), Width (cm) and Height (cm) and derives Volume (litres) and Volume (US gallons) from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

3 values: Length (cm), Width (cm) and Height (cm). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Length (cm) = 60, Width (cm) = 30 and Height (cm) = 40, the calculator returns Volume (litres) = 72 and Volume (US gallons) = 19.02. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Length (cm) = 66, Width (cm) = 33 and Height (cm) = 44 instead, Volume (litres) goes from 72 to 95.832 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Length (cm) = 54, Width (cm) = 27 and Height (cm) = 36, Volume (litres) comes out at 52.488. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Homework and site work alike: how much paint a wall takes, how much water a tank holds, whether a corner is square — and, on the coordinate side, the slope between two points, the distance across a plan, the midpoint of a span.

What is the most common mistake?

Mixing units inside one shape. Entering a length in centimetres and a width in metres gives an area wrong by a factor of a hundred, and the result looks perfectly plausible.

What is the difference between the Aquarium volume calculator and the Triangular prism volume calculator?

This one returns Volume (litres) and Volume (US gallons); the Triangular prism volume calculator returns Volume. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Volume calculator is the closest one after this: Compute the volume of a box, cube, sphere, cylinder or cone.

What else is worth having open alongside it?

Cone volume calculator and Cylinder volume calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
How-toWhat Wattage of Heater Does an Aquarium Need? Volume Is Only Half the AnswerThe same tank needs a 100 W heater in a warm flat and 300 W in an unheated room. The variable is the gap between the water and the room, which most rules of thumb drop entirely. Plus why two smaller heaters beat one big one, and where this calculator's recommendation stops being trustworthy.How-toHow Much Substrate Does an Aquarium Need? Depth, Weight and Grain SizeThe depth follows the job: a bare display, a planted tank whose roots need room, an under-gravel plate. Then comes the number people are unprepared for — substrate is what puts a filled tank past what a piece of furniture can hold. Plus why fine sand compacts and coarse gravel traps waste.ExplainerHow Many Fish Can a Tank Hold? The Inch-per-Gallon Rule Is WrongEvery stocking calculator implements a length-per-volume rule, and waste output scales with body mass, not length. A fish twice as long makes nearly five times the ammonia. Run through the tool's five methods, the same tank comes back holding anywhere from 6 to 12 fish.How-toHow to Calculate VolumeVolume is the space inside a shape. Here's how to find it for boxes, cylinders and spheres, and why keeping your units consistent is the whole game.How-toCircle: Circumference and AreaCircumference is 2πr, area is πr². Here's how radius, diameter and π fit together, both formulas worked through, and how not to mix them up.How-toCooking Measurement ConversionsA few anchors — cups, tablespoons, grams — cover most recipes. Here's the handful worth memorising, why weight beats volume, and when to reach for a scale.