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Pool volume calculator

Compute the water volume of a rectangular pool in cubic metres, litres and gallons.

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Need Volume (m³), Volume (litres), Volume (US gallons)? The Pool volume calculator derives it from Length (m), Width (m), Average depth (m) in one step. For instance, with Length (m) = 8, Width (m) = 4 and Average depth (m) = 1.5 it returns Volume (m³) = 48, Volume (litres) = 48,000 and Volume (US gallons) = 12,680.

How to use it

  1. Enter your values: Length (m), Width (m), Average depth (m).
  2. Read the result instantly: Volume (m³), Volume (litres), Volume (US gallons).

Frequently asked questions

How does the Pool volume calculator work?

It takes Length (m), Width (m) and Average depth (m) and derives Volume (m³), Volume (litres) and Volume (US gallons) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

3 values: Length (m), Width (m) and Average depth (m). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Length (m) = 8, Width (m) = 4 and Average depth (m) = 1.5, the calculator returns Volume (m³) = 48, Volume (litres) = 48,000 and Volume (US gallons) = 12,680. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Length (m) = 8.8, Width (m) = 4.4 and Average depth (m) = 1.7 instead, Volume (m³) goes from 48 to 65.824 — 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 (m) = 7.2, Width (m) = 3.6 and Average depth (m) = 1.4, Volume (m³) comes out at 36.288. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Buying the right amount at the merchant: how many tiles, how much paint, how many bags of concrete, and what it all comes to.

What is the most common mistake?

Ordering the exact calculated quantity. Cuts, breakage and pattern matching mean tiles need 10% spare and more on a diagonal layout — and a second batch rarely matches the first for colour.

What is the difference between the Pool volume calculator and the Concrete calculator?

This one returns Volume (m³) and Volume (litres); the Concrete calculator returns Concrete volume (m³) and Approx. weight (kg). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Cubic yard calculator is the closest one after this: How much concrete, gravel, soil or mulch fills an area to a given depth. Enter length and width in feet and the depth in inches; it returns the volume in cubic yards (how material is sold in the US) and cubic feet.

What else is worth having open alongside it?

Deck stain calculator and Gravel calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
How-toHow to Calculate Pool Volume: A Formula per Shape, and the Depth TrapLength × width × average depth gives 21,065 gallons for a 32 by 16 ft pool. But average depth only means (shallow + deep) ÷ 2 when the floor slopes evenly, and most pools do not. Here is every shape formula and the correction.How-toHow Much Sand Do I Need? Volume and Weight Made EasySize a sand order from area and depth: get the volume in cubic yards and the weight in tons for a bedding layer, sandbox or base course.How-toHow Much Gravel Do I Need?Multiply area by depth for a volume, then convert to weight — gravel is about 1.5 tonnes per cubic metre. Here's the method, depths by job, and how to order.How-toHow to Measure Roof PitchRoof pitch is rise over run, like 6:12. Here's how to measure it with a level, how to convert it to an angle or percentage, and why it matters.GuideMaterials for a Retaining Wall — And the Thing That Actually Makes Them Fall OverBlocks, base gravel, drainage stone, geogrid and pipe, counted from the calculator's own output. Then the number nobody puts in a materials list: a saturated backfill pushes about 2.2 times as hard as a drained one.How-toHow Much Concrete Do You Need for Fence Posts?Work out the concrete for setting fence posts: hole volume minus the post, converted into bags of ready-mix, with the rule of thumb for hole depth and width.