Pool Chemical Dosing Calculator

Muriatic acid only lowers pH. When your current pH reading is already at or below your target, this calculator returns zero ounces of acid rather than suggesting a negative dose, because raising pH requires a different chemical, typically soda ash, which this tool does not calculate a dose for.

Yes — every dose in this calculator scales directly with pool volume, since the underlying industry ratios are expressed per 10,000 gallons and then multiplied by your pool's actual size. A pool twice the volume needs roughly twice the acid, chlorine, or baking soda to achieve the identical change in reading.

pH, chlorine, and total alkalinity interact with each other in real pool chemistry — raising alkalinity with baking soda also nudges pH upward, for example — so adding all three doses at once based on a single test can overshoot one reading while correcting another. Waiting 4-6 hours and retesting lets each adjustment settle before the next one is calculated.

They're widely used industry approximations rather than exact chemistry — the 26 oz-per-0.2-pH-drop, 2 oz-per-1-ppm-chlorine, and 1.5 lb-per-10-ppm-alkalinity ratios are reasonable starting points, but your pool's actual response depends on cyanuric acid level, total dissolved solids, and water temperature, so always retest before assuming the target is hit exactly.

The ideal swimming pool pH range is generally 7.2-7.6, which is where chlorine sanitizes most effectively and swimmers experience the least eye and skin irritation — untreated pool water tends to drift upward toward 7.8-8.0 over time from factors like aeration and calcium buildup, which is why a downward acid adjustment is the more common correction.