Keeping your pool water balanced starts with knowing how much water it holds. This free pool chemical calculator estimates your pool volume in litres and the chlorine dose needed to raise your level to target. It uses metric units by default — switch to the imperial toggle to enter your dimensions in feet instead. Just enter your pool dimensions and the chlorine increase you need.
Pool Chemical Calculator
Choose metric or imperial, then enter your pool dimensions to estimate its volume and chlorine dose.
Your results
Disclaimer: This is an estimate only. Always follow the product label, and test your water with a reliable kit before and after dosing.
How to use this calculator
- Enter your pool dimensions — choose rectangular or circular, then add the length (or diameter), width and average depth in metres.
- Select the chlorine raise needed — pick 1, 2 or 3 ppm depending on how far below your target the test reading is.
- Read your results — the calculator shows your pool volume in cubic metres and litres, plus the chlorine dose in grams.
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Frequently asked questions
What type of chlorine is this dose for?
The dose is calculated for calcium hypochlorite with 65% available chlorine, a common granular pool chlorine. If your product differs, follow its label.
Why is average depth used?
Most pools slope from a shallow to a deep end, so averaging the depth gives a more realistic volume than using the deepest point alone.
Is this result exact?
No — it is an estimate only. Always follow the product label, test your water with a reliable kit, and re-test after dosing.