PooloraLiquid pool chlorine calculator
Estimate liquid chlorine doses from pool volume, free chlorine readings and label strength. Supports trade percent and sodium hypochlorite by weight.
Use a fresh free-chlorine test and choose a target appropriate to your product label and pool. This tool estimates a routine increase; it is not an algae treatment or a swimming clearance.
How the calculation works
Required available chlorine = increase in ppm × liters. For trade strength, each 1% provides 10 mg of available chlorine per mL. For sodium hypochlorite by weight, the engine also uses density and the Cl₂/NaOCl molar ratio.
Worked example
For a 10,000-gallon pool, raising free chlorine from 1 to 3 ppm with 10% liquid chlorine takes about 3.25 cups (26 fl oz · 755 mL). In metric, 50,000 L from 1 to 3 ppm takes 1,000 mL. This example is not a recommended target for every pool.
Before using the result
Trade % means grams of available chlorine per 100 mL. Do not enter a sodium-hypochlorite weight percentage in that mode. For weight %, enter density from the product safety data sheet. Old liquid chlorine may be weaker than its original label.
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