Calculate your swimming pool's volume in gallons and liters. Get fill time estimates, chemical starting doses for a fresh fill, and water heating cost for rectangular, oval, round, and kidney pools.
Pool shape 4 shapes
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Leave same as shallow for flat-bottomed pools
GPM
Standard garden hose: 8–12 GPM
$
US average: $3–$8 per 1,000 gal
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US gallons
Rectangular pool
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Liters
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Fill time (hose)
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Water cost
Pool surface area—
Average depth—
Volume—
US gallons—
Cubic feet—
Cubic meters—
Fill time at chosen GPM—
Starting chemical doses (fresh fill) Approximate — always test water first
⚠️ These are approximate starting doses for reference. Always test your water with a test kit before adding chemicals and follow product label directions. Water chemistry varies by source water quality.
Frequently asked questions
How many gallons is a 16×32 pool? ›
A standard 16×32 ft rectangular pool with a shallow end of 3.5 ft and deep end of 8 ft holds approximately 26,000–28,000 gallons. The exact volume depends on the shape of the slope between shallow and deep ends. This calculator uses the average depth method: (shallow + deep) ÷ 2 × length × width × 7.48 gallons per cubic foot.
How long does it take to fill a pool with a hose? ›
A standard garden hose flows at about 8–12 gallons per minute (GPM). To fill a 25,000 gallon pool at 10 GPM: 25,000 ÷ 10 = 2,500 minutes = 41.7 hours (about 2 days). Many people use multiple hoses or arrange a water delivery tanker for large pools. This calculator shows fill time based on your entered GPM.
How much chlorine do I need for a new pool? ›
For initial startup with a fresh fill, add shock (calcium hypochlorite 68%) at approximately 1 lb per 10,000 gallons to achieve a chlorine level of 1–3 ppm. Always test water before adding chemicals. For ongoing maintenance, liquid chlorine (sodium hypochlorite) or trichlor tablets are added based on weekly test results. Aim for 1–3 ppm free chlorine and pH of 7.4–7.6.
How do I calculate pool volume for an irregular shape? ›
For irregular shapes, divide the pool into simpler geometric sections (rectangles, circles), calculate each section's volume separately, then add them together. For a kidney shape, the formula uses the two width measurements: Volume = Length × (Width1 + Width2) × 0.45 × average depth × 7.48 gal/ft³. This is the formula used in the kidney shape mode above.
About this pool calculator
This pool volume calculator supports four common pool shapes using the appropriate geometric formula for each. For rectangular pools it uses length × width × average depth. For ovals it uses the ellipse formula (π × a × b × depth). For circles it uses π × r² × depth. For kidney shapes it uses the industry-standard (W1 + W2) × L × 0.45 × depth formula.
Chemical dose estimates
The chemical starting doses shown are approximate guidelines based on pool volume. Water chemistry depends heavily on your source water's pH, alkalinity, calcium hardness, and cyanuric acid levels. Always start with a water test from your pool store or a test kit before adding any chemicals.