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Pool Volume Calculator

Calculates swimming pool volume from its shape and average depth, then the fill time, fill cost and how much chlorine or salt to add.

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In short Pool Volume Calculator is a free online tool on inputtesthub.com that calculates swimming pool volume from its shape and average depth, then the fill time, fill cost and how much chlorine or salt to add. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Pool Volume Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Pool Volume Calculator

The Pool Volume Calculator calculates swimming pool volume from its shape and average depth, then the fill time, fill cost and how much chlorine or salt to add. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Working out the dose before adding anything.
  • Sizing a pump for a target turnover.
  • Costing a refill after draining.

Details

Average depthMean of shallow and deep
1 m³1,000 litres, 264 US gallons
Free chlorine target1–3 ppm
Salt chlorinator≈ 3,000 ppm
TurnoverWhole volume through the filter in 8 hours

The maths behind it

This tool uses volume = surface area × average depth, where average depth is the mean of the shallow and deep ends. Chlorine dose in grams = cubic metres × ppm rise ÷ the product strength. Every intermediate value is shown on screen, so the result can be checked by hand.

Add chemicals with the pump running, one product at a time, and retest after a full turnover rather than immediately. Never mix concentrates — chlorine and acid together produce chlorine gas. These are planning quantities; the label on your own product is the authority on its strength and on how it should be added.

Where this tool stops

It assumes a flat slope between the two depths. A pool with a sharp drop-off, a spa step or a beach entry holds noticeably less than the average-depth model says, and for those the honest method is to meter the fill.

Explained in our guides

All guides

Frequently asked questions

Should I use the deep end to work out volume?
No — the average of the shallow and deep ends. Using the deep end on a sloped pool overstates the volume by about a third, and every chemical dose calculated from it is over by the same amount. It is the most common and most expensive pool-chemistry mistake.
How much chlorine raises my pool by 1 ppm?
Depends entirely on the product, which is why the table gives four. One gram of pure chlorine per cubic metre is 1 ppm, so at 65% calcium hypochlorite you need 1.54 g per m³, and at 12.5% liquid you need 8 g. Reading a dose off a chart meant for a different strength is how pools end up shocked when they were meant to be topped up.
Is the Pool Volume Calculator free?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Can you see what I put into this utility?
No. The Pool Volume Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
How is the result calculated?
It uses volume = surface area × average depth, where average depth is the mean of the shallow and deep ends. Chlorine dose in grams = cubic metres × ppm rise ÷ the product strength. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What problem does the Pool Volume Calculator solve?
The jobs it is built for: working out the dose before adding anything. Sizing a pump for a target turnover. Costing a refill after draining. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
When is the Pool Volume Calculator not the right tool?
It assumes a flat slope between the two depths. A pool with a sharp drop-off, a spa step or a beach entry holds noticeably less than the average-depth model says, and for those the honest method is to meter the fill. Knowing where a tool stops being trustworthy matters more than the cases where it works.
Which values should I know?
Average depth is Mean of shallow and deep. 1 m³ is 1,000 litres, 264 US gallons. Free chlorine target is 1–3 ppm. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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