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Pool Volume Calculator
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Pool Volume Formula
Rectangular: Length × Width × Depth
Circular: π × (Diameter ÷ 2)² × Depth
Oval: π × (Length ÷ 2) × (Width ÷ 2) × Depth
Kidney: Length × Width × 0.75 × Depth
Litres: m³ × 1000
Circular: π × (Diameter ÷ 2)² × Depth
Oval: π × (Length ÷ 2) × (Width ÷ 2) × Depth
Kidney: Length × Width × 0.75 × Depth
Litres: m³ × 1000
Note: Use average depth — (shallow end + deep end) ÷ 2. Kidney shape uses a 0.75 factor to approximate the irregular form.
Pool Volume Calculator — How Many Litres in My Pool?
Australia has over 1.35 million residential swimming pools (Roy Morgan, 2024). Knowing your pool’s exact volume is essential for chemical dosing, pump sizing, heating costs, and water compliance.
Common Pool Sizes
| Type | Dimensions | Volume |
|---|---|---|
| Plunge | 3m×2.5m×1.2m | 9,000 L |
| Small | 6m×3m×1.5m avg | 27,000 L |
| Medium | 8m×4m×1.5m avg | 48,000 L |
| Large | 10m×5m×1.6m avg | 80,000 L |
| Lap | 12m×3m×1.4m | 50,000 L |
Formulas by Shape
- Rectangular: L × W × Avg Depth × 1,000 = Litres
- Circular: π × (D/2)² × Depth × 1,000
- Oval: π × (L/2) × (W/2) × Depth × 1,000
- Kidney: L × W × 0.75 × Depth × 1,000
Chemical Dosing Guide (per 10,000L)
| Chemical | Amount | Purpose |
|---|---|---|
| Liquid Chlorine | 2 L | Sanitise (2ppm) |
| pH Decreaser | 1 kg | Lower pH to 7.2–7.6 |
| Salt (salt pools) | 40 kg | 4,000ppm for chlorinator |
Frequently Asked Questions
How to calculate pool volume in litres?
L × W × Avg Depth (metres) × 1,000. E.g., 8×4×1.5 = 48m³ = 48,000 litres.
Cost to fill a pool?
At ~$3.50/kL, a 50,000L pool costs ~$175 from mains. Water trucks cost $150–$300 per 10,000–13,000L load.
Fill time with a garden hose?
~20L/min. A 50,000L pool takes ~42 hours of continuous running.
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