Get the exact answer your pool needs.
Enter your pool volume and current levels. Get precise chemical amounts — in seconds. Instant results, no guessing, no forum rabbit holes.
No Guessing
Exact chemical amounts, every time
30 Sec
From test strip to answer
Any Pool
Salt, chlorine, pH, alkalinity, CYA
Pick your chemical. Get your answer.
How much salt to add to your salt water pool. Results in lbs, kg, and bags.
Algae, cloudy water, and routine shocking. Dosed by product and pool volume.
Raise or lower your pool pH with exact muriatic acid or soda ash amounts.
Stabilise your pool's pH buffer with precise baking soda or dry acid amounts.
Protect your chlorine from UV degradation with the right cyanuric acid level.
Calcium hardness, borates, and more. Suggest a tool.
Three steps. Thirty seconds.
Test your water
Use a test strip or liquid test kit to get your current chemical levels in PPM or mg/L.
Enter your numbers
Input your pool volume and current reading. Gallons and litres both supported.
Add exactly that amount
Get the precise weight and bag count to add. No estimation, no range — just the number.
Pool chemistry is simpler than it looks.
There are really only five numbers that matter for a healthy pool. Get those right and everything else follows.
Algae growth and unsafe swimming conditions
Eye irritation, equipment corrosion, and cloudy water
Clear water, protected equipment, comfortable swimmers
Gets you to balanced — fast, free, and without the guesswork
Built differently from the rest.
All calculations happen locally. Your pool data never touches our servers.
Open a calculator and use it. No sign-up, no email, no friction.
We don't run ads or partner with chemical brands. The result is uninfluenced.
Mobile-first. Works on any device, in any lighting, with one hand.
Gallons, litres, pounds, kilograms — pick whatever units you test in.
We fix bugs fast. Found a wrong result? Tell us — we'll sort it immediately.
Understand your pool, not just the numbers.
How salt chlorinators work and what levels to target for a healthy pool.
Why pH drifts, what causes it, and how to keep it in range without overcorrecting.
Cyanuric acid shields chlorine from UV — without it, you'll burn through chemicals fast.
A simple testing schedule for busy pool owners — what to check and when.
Things people ask before they start.
Everything you need to know about measuring your pool, testing accurately, and adding chemicals safely — before you run the numbers.
Ready to start
Stop guessing. Start knowing.
Pick a calculator and get your answer in under 30 seconds — no account, no cost, no noise.