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About

Pool calculators for owners who want the math, not a sales pitch.

What this site is for

Pool Care Calculators is a small independent tool site for routine backyard pool math. The site is built around one simple idea: if you already have a water test result, you should be able to enter the numbers, see the estimate, and understand the formula before adding anything to the pool.

Pool Care Calculators is built and maintained by an independent operator who manages a backyard saltwater pool. The calculators are written from real maintenance experience — reading salt cell diagnostics, testing with strips and drop kits, and recalibrating when numbers drift. There is no editorial team, no manufacturer affiliation, and no pool-industry sponsorship.

How the tools are written

Calculator pages start with common pool owner tasks: estimating gallons, raising salt, adjusting free chlorine, correcting pH, raising or lowering alkalinity, adding stabilizer, and planning a shock dose. The formulas are kept visible whenever the math can be shown clearly.

The site favors conservative guidance. Large corrections are usually framed as staged additions because pool volume estimates, test strips, reagent kits, and chemical labels all have some real-world error. Adding less, circulating, and retesting is usually easier than fixing an overshoot.

How to use the estimates

  1. Start with a reliable water test and a reasonable pool volume estimate.
  2. Compare the calculator result with the product label and equipment manual.
  3. Add chemicals in stages when the correction is large or the result is uncertain.
  4. Brush, circulate, wait the recommended time, and retest before fine tuning.

Current calculator library

The site is built as a pool care calculator system.

A single salt calculator is useful. A linked set of pool chemistry calculators is more useful because the next step often depends on the previous result. The current pages are intentionally connected so a pool owner can estimate gallons once, save local defaults, then move between related adjustments without retyping everything.

Pool Salt Calculator Pounds, bags, cost, and a staged add plan Pool Chlorine Calculator Product amount, ppm raise, side-effect note, and retest plan Pool pH Calculator Conservative dose, first-add amount, and retest guidance Pool Alkalinity Calculator Baking soda pounds or acid-stage plan with pH warning Pool Stabilizer Calculator Dry stabilizer pounds, ounces, staged add plan, or dilution warning Pool Volume Calculator A gallons estimate you can send into the salt calculator Pool Pump Size Calculator Required GPM, turnover estimate, filter-limit warning, and sizing boundaries Pool Heating Cost Calculator BTU needed, runtime, fuel use, heat-up cost, and weather caveats Pool Shock Calculator Estimated liquid chlorine or cal-hypo amount

Visible formulas

Pages include the formula, conversion, or dosing assumption behind the result when it can be explained without hiding the math.

Local defaults

The My Pool panel stores gallons and targets in browser local storage. There is no account and no pool database.

Plain limits

When a result depends on product strength, label directions, or equipment range, the page says so instead of pretending the estimate is exact.