POOL & SPA MAINTENANCE

Pool Chemical & Water Volume Calculator

Calculate total pool volume in gallons and liters, and determine exact chemical dosing for liquid chlorine, shock, and pH adjustments.

Pool Geometry & Dimensions

Length (feet)

Width (feet)

Shallow End Depth (feet)

Deep End Depth (feet)

Chemical Balance & Dosage

Current Free Chlorine (ppm)

Target Free Chlorine (ppm)

Current Water pH

Target pH Level

Total Volume in Gallons

16,831 gal

= 63,713 liters

To Raise Free Chlorine

Liquid Pool Chlorine (10–12.5% Sodium Hypochlorite)

44 fl oz

(~ 1.4 quarts)

Granular Shock (65% Cal-Hypo)

6.7 oz

(~ 0.4 lbs)

To Balance Water pH

Muriatic Acid (pH Lowerer)

34 fl oz

To lower pH from 7.8 to 7.4.

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How it works

Select pool shape and enter dimensions with shallow and deep end depths in feet.
Review total water volume in US gallons and liters.
Input current test kit readings for free chlorine and pH to receive exact chemical addition measurements.

Frequently asked questions

What is the recommended free chlorine and pH level for swimming pools?

Maintain free chlorine between 2.0 and 4.0 ppm and water pH between 7.4 and 7.6 to maximize sanitizer efficiency, prevent algae growth, and prevent eye/skin irritation.

How do you calculate pool volume in gallons?

For rectangular pools: Length × Width × Average Depth × 7.48. For round pools: Radius² × π × Average Depth × 7.48.

Is this tool free?

Yes. The site is supported by ads, so you never pay or need to create an account.

Does it work on mobile?

Yes. The page adapts to your screen and does not require installing any app.