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Pool Chemical Dosing Calculator

Calculate how much chlorine and pH adjuster to add to your swimming pool to reach target water chemistry levels.

Pool volume in litres. Rectangular pool: L(m) รƒโ€” W(m) รƒโ€” Avg Depth(m) รƒโ€” 1000.
Current free chlorine level in ppm (mg/L). Measured with a test kit or strips.
Target free chlorine level in ppm. Ideal range: 2-4 ppm.
Current pH level of the pool water.
Target pH level. Ideal range: 7.2-7.6.

Results

Chlorine Granules to Add (65% Ca(ClO)2)192 g of 65% Ca(ClO)2 to add
pH Adjuster to Add250 g pH adjuster (soda ash to raise, dry acid to lower)

๐Ÿ“–What is it?

Swimming pool water chemistry requires maintaining free chlorine (sanitiser) and pH within tight ranges. This calculator estimates the weight of 65% calcium hypochlorite granules to raise chlorine levels and the weight of soda ash (raise pH) or dry acid (lower pH) needed for adjustment.

๐ŸŽฏHow to use

Test your pool water with a reliable test kit, enter the current and target levels for chlorine and pH, and input your pool volume. The calculator shows grams of each chemical to add. Always re-test after 4-6 hours of circulation before adding more chemicals.

๐Ÿ’กExample scenario

A 50,000 L pool with chlorine at 0.5 ppm needs to reach 3.0 ppm: difference = 2.5 ppm. Chlorine granules needed = 2.5 รƒโ€” 50000 / 1000 รƒโ€” (100/65) รขโ€ฐห† 192 g. pH needs to move from 7.2 to 7.4: soda ash needed = 0.2 รƒโ€” 50000 / 1000 รƒโ€” 25 = 250 g.

๐Ÿ†Pro tip

IMPORTANT: Always add chemicals to water รขโ‚ฌโ€ never water to chemicals รขโ‚ฌโ€ to avoid dangerous splashing reactions. Pre-dissolve granules in a bucket of pool water before adding. Test and adjust one parameter at a time. Ideal ranges: Free Chlorine 2-4 ppm, pH 7.2-7.6, Total Alkalinity 80-120 ppm, Calcium Hardness 200-400 ppm. High pH dramatically reduces chlorine effectiveness.