calcs.homes
calcs.homes
Pick a chemical, enter your current and target test-kit reading, and we'll calculate exactly how much to add — one calculator for chlorine, alkalinity, calcium, stabilizer, and salt.
Estimate only — add gradually, circulate, and retest before adding more.
Every chemical on this page follows the same formula: subtract your current reading from the target, divide pool volume by 10,000 gallons, then multiply by a dosing constant sized to that chemical and product strength — for example 10.1 fl oz of 10% liquid chlorine, 0.15 lb of baking soda for alkalinity, or 0.125 lb of calcium chloride, all per 10,000 gallons per 1 ppm. If current already exceeds target, the result comes back negative and is flagged as dilute or drain instead.
These dosing constants come from standard pool-industry charts that translate a ppm change into product volume or weight for a given concentration — 10% liquid chlorine needs more volume than 12.5% to deliver the same boost, for instance. Treat the result as a starting dose: water temperature, existing stabilizer levels, and bather load all shift real-world demand, so adding chemicals gradually with a retest afterward beats one large addition.
This page covers every chemical in one place. If you already know which one you need, calcs.homes also has a dedicated page for each — pH, salt, alkalinity, chlorine, stabilizer, and calcium hardness — with more specific product guidance.
Dosing charts assume average conditions — water temperature, existing stabilizer levels, and product concentration all shift real-world demand. Treat the result as a starting dose, then retest.