Free tools
Water care calculators,free and instant.
Skip the dosing charts. Get pool gallons, true aquarium volume, and the numbers you need before adding anything to your water.
Pool Volume Calculator
Get accurate gallons for rectangular, round, oval, and kidney shaped pools. Use it before any chlorine, acid, or stabilizer dose.
Open calculatorAquarium Volume Calculator
Convert length, width, and height to true water volume. Adjusts for substrate so dosing and turnover targets are accurate.
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Common questions
- Are these calculators free?
- Yes. Every tool on this page is free, requires no login, and runs entirely in your browser.
- How accurate are the results?
- Calculations are based on standard volume formulas and the inputs you provide. Real water volume can vary slightly from displacement, so we round in the safer direction for dosing.
- Can I save my results?
- Create a free Ally account and your water bodies, volumes, and tests are saved and analyzed over time.