Skip to Main Content »

Tel: 01495 791726 Twitter

Swimming Pool Size Calculator

Calculating Pool Volumes

Knowing your pool's volume is vital when making adjustments as all calculations and dose rates are based on it.
There are two easy ways to obtain this information

ASK THE SUPPLIER OF THE POOL or NOTE THE WATER METER READINGS BEFORE AND AFTER FILLING IT

Here is a resource to help you and to convert units into those most useful to you. As mains water is supplied in Britain in cubic metres, start by measuring in metres to obtain an answer in cubic metres. Then use the calculator to convert this figure into litres, imperial gallons or US gallons.

Rectangle & Square pools

Enter Dimensions of pool

If the pool has a flat bottom, enter the
same figure for max and min depth.

Metres
Feet
Inches
The Volume of Water
Calculate

If your pool has a sloping bottom, then take the deepest measurement (D2) and the shallowest (D1). If there are different levels, then you need to do several calculations of area for each depth and add them up at the end.

Circular

Enter Dimensions of pool

If the pool has a flat bottom, enter the
same figure for max and min depth.

Metres
Feet
Inches
The Volume of Water
Calculate

Ellipses

Enter Dimensions of pool

If the pool has a flat bottom, enter the
same figure for max and min depth.

Metres
Feet
Inches
The Volume of Water
Calculate

If your pool has a sloping bottom, then take the deepest measurement (D2) and the shallowest (D1). If there are different levels, then you need to do several calculations of area for each depth and add them up at the end.

Irregular Shapes

For irregular shapes, calculating the area is less accurate. You will need to draw up the pool accurately to scale on graph paper using a square on the paper to represent a meter (or foot) square of pool. When you have finished, count the squares.

For partial squares, count anything over half as one and ignore any under a half. When you have the area (A) multiply by depth (D) for the Volume in cubic metres. If you have several depths, break up your area calculation for each depth.

Enter Dimensions of pool

If the pool has a flat bottom, enter the
same figure for max and min depth.

Metres
Feet
Inches
The Volume of Water
Calculate

Conversion into different units

You can easily convert units using the this calculator
(Results are rounded to 4 decimal places)

Cubic Metres to Litres - Multiply by 1000

Calculate

Cubic Metres to UK Gallons - Multiply by 219.969

Calculate

UK Gallons to Litres - Multiply by 4.54609

Calculate

US Gallons to Litres - Multiply by 3.785411

Calculate

UK Gallons to US Gallons - Multiply by 1.20095

Calculate

US Gallons to UK Gallons - Multiply by 0.832674

Calculate