Pool Volume Calculator
Calculate swimming pool volume in litres, US gallons, and cubic metres for rectangular, round, oval, or kidney-shaped pools.
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How to use this calculator
Average depth = (shallow depth + deep depth) / 2 for sloped-floor pools. Volume in litres = volume in m³ × 1000. US gallons = m³ × 264.172.
- 1
Select your pool shape.
- 2
Enter the pool dimensions in metres (length, width, or diameter as applicable).
- 3
Enter the shallow end and deep end depths.
- 4
Read the pool volume in litres, US gallons, and cubic metres.
Frequently asked questions
Why do I need to know my pool volume?
Pool volume is essential for calculating the correct amount of chemicals (chlorine, pH adjusters, algaecides), sizing a pump and filter, and understanding your water bills. Accurate dosing prevents under- or over-treatment.
How do I measure a kidney-shaped pool?
Treat a kidney pool as an oval by measuring its longest length and widest width. The calculator applies an 85% correction factor to account for the kidney indentation. For precise volumes, break the pool into two overlapping ovals and sum them.
How long does it take to fill a swimming pool?
A standard garden hose delivers 10–20 litres per minute. A 50,000-litre pool would take 40–80 hours to fill from a hose. Most homeowners use a tanker delivery or a mains water connection for faster fill times.
Pool Volume Calculator — Litres, Gallons & Cubic Metres
Why Pool Volume Matters for Chemical Dosing
Every pool chemical is dosed per 10,000 litres (or 10,000 US gallons in North America). Knowing your exact pool volume prevents under-dosing (leaving the pool unsafe) or over-dosing (wasting chemicals and causing skin irritation).
Pool Shapes and Volume Formulas
Rectangular pools use a simple length × width × average depth formula. Circular pools use π × radius² × depth. Oval pools use π × (L/2) × (W/2) × depth. Kidney and freeform pools are typically estimated as 85–90% of the equivalent oval.
Average vs Constant Depth
Most residential pools have a sloping floor from a shallow end (around 1 m) to a deep end (around 2 m). Using the average depth gives a sufficiently accurate volume for chemical calculations. For a constant-depth pool (common in lap pools), enter the same value for both depth fields.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →