Free pool calculators — no app needed

Test your water.
We’ll do the math.

Enter your test results and get exact doses for chlorine, pH, alkalinity, salt and more. Every calculator runs on the industry-standard formulas — and shows its work.

Open the full dashboard Browse all calculators

Taylor / TFP-sourced formulas
Remembers your pool
No login, ever

1

Test your water

Strips work; a drop kit is better. Two minutes either way.
2

Enter your results

The dashboard takes every reading at once.
3

Add what it says

Exact doses in pounds, ounces or cups — with the math shown.

The toolbox

Every calculator, grouped the way you use them

Set your pool volume once — every tool remembers it.

Water Chemistry

Doses and balance — the numbers you use every week.

Pool Volume Rectangle, round, oval or kidney, with variable depth. Feeds every other tool. Chlorine Dosing Liquid, cal-hypo, dichlor or trichlor — how much to hit your target FC. pH Adjustment Muriatic acid to bring it down, soda ash to bring it up. Total Alkalinity Baking soda doses to raise TA without wrecking your pH. Calcium Hardness Calcium chloride doses — and when dilution is the better play. CYA / Stabilizer The right stabilizer level for your sanitizer, and when you have too much. Pool Salt Exact bags of salt to reach your generator’s sweet spot. Shock / SLAM Breakpoint chlorination doses to clear algae and combined chlorine. LSI / CSI Balance Is your water scaling or corrosive? The full saturation index. Dilution How much to drain and refill to lower CYA or calcium. Borate Borax and acid doses to reach 30–50 ppm borates. Bleach Strength Converter 6% vs 10% vs 12.5% — equivalent doses and cost per ppm of FC.

Equipment & Sizing

Buy the right size the first time.

Heater Sizing Gas BTU or heat pump sizing from your volume and temperature rise. Pool Pump Sizing Required flow at head, checked against your filter, heater, salt cell and water features. Pipe Size & Friction Loss Velocity and head loss for any pipe size and flow — the size your suction and return lines need. Total Dynamic Head Feet of head from your gauges, or added up from pipe, filter and heater — at the flow that matters. Pump Run Time Turnover math: how long your pump actually needs to run. Salt Cell Sizing Match cell output to your pool — and why oversizing pays off. Variable-Speed Savings What a variable-speed pump would save you per year, in dollars. Cover Savings Evaporation and heat loss a cover prevents — in gallons and dollars.

Costs & Savings

What running the pool really costs.

Heating Cost Time and money to raise your water temperature X degrees. Pump Electricity Cost Your pump’s real share of the power bill. Cost to Fill What a full or partial refill costs at your local water rates.

Hot Tub & Spa

Small water, fast chemistry.

Hot Tub Volume Round, square and lounger shells — know your gallons. Hot Tub Dosing Bromine or chlorine doses scaled for small, hot water.

Guides

The why behind the numbers

Short, honest guides that pair with the calculators — how to raise or lower every parameter, and how to fix what's gone wrong.

Pool chemical levels chart Every target range in one place — and why chlorine is the one number that has no fixed answer. The chlorine / CYA relationship Why stabilizer decides your chlorine target. How to fix a green pool The SLAM process, start to finish — and why "double the shock" fails.

All guides →

Math you can check

Every dose comes from the standard Taylor and Trouble Free Pool formulas, cited on each page — with a “show the math” breakdown on every result.

Private by design

No accounts, no tracking dashboards. Your pool profile lives in your browser and nowhere else.

Honest recommendations

When a result suggests a product, it's the one the math justifies — and we say so when the cheap option wins. Some links earn us a commission; that never changes the numbers.

Test your water.We’ll do the math.

Test your water

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