Olympic Pool Volume: Gallons, Litres & Converter
Example: 1 Olympic pool = 3.125 million L = 825,538 US gal
A minimum-size Olympic pool (50 m × 25 m × 2.5 m under World Aquatics rules for the Olympic Games and World Championships) holds 3,125 m³: 3.125 million litres, about 825,538 US gallons, 687,404 UK gallons and roughly 3,125 tonnes of water. Enter any volume below to see how many pools it fills.
Calculation results updated
Pools Filled
Each 🏊 = 1 minimum Olympic competition pool (3.125 million L)
Olympic Pools
Exact Pool Equivalent
Volume in Litres
Volume in US Gallons
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How We Calculate This
Volume is converted to litres (m³ × 1,000; US gallons × 3.785411784; UK gallons × 4.54609; pools × 3,125,000), then divided by 3,125,000. Gallon outputs use the same exact factors, and weight assumes 1 tonne per m³ (warm pool water is about 0.3% lighter). The divisor is the rectangular volume from the February 2026 World Aquatics Olympic/World Championships minimum dimensions: 50 m × 25 m × 2.5 m.
Methodology last reviewed: October 2026. How SparkCalc works
Sources: World Aquatics: Competition Regulations, February 2026 (Swimming Facilities 15.1–15.4) · NIST Handbook 44, Appendix C: General Tables of Units of Measurement (US and imperial gallon)
Olympic pool volume in litres and gallons
Volume of a 50 m × 25 m pool at three depths. World Aquatics sets 2.5 m as the minimum depth for the Olympic Games and World Championships (Competition Regulations 15.3 and 15.4, February 2026).
| Depth | Cubic metres | Litres | US gallons | UK gallons |
|---|---|---|---|---|
| 2.0 m | 2,500 m³ | 2.5 million | 660,430 | 549,923 |
| 2.5 m (Olympic minimum) | 3,125 m³ | 3.125 million | 825,538 | 687,404 |
| 3.0 m | 3,750 m³ | 3.75 million | 990,645 | 824,885 |
Rectangular volume only. Real pools vary in depth profile and operating water level, so check the venue for an exact figure.
Common volumes in Olympic swimming pools
These equivalents use 3.125 million litres per pool, based on the February 2026 minimum Olympic Games and World Championships dimensions.
| Volume | Minimum Olympic pools |
|---|---|
| 1 million litres | 0.32 pool |
| 2.5 million litres | 0.80 pool |
| 3.125 million litres | 1 pool |
| 10 million litres | 3.2 pools |
| 1 billion litres | 320 pools |
Real competition pools may be deeper and hold more water.
Frequently Asked Questions
How many gallons are in an Olympic swimming pool?
A minimum-size Olympic pool holds about 825,538 US gallons (687,404 UK gallons), which is 3.125 million litres. A pool built 3.0 m deep holds about 990,645 US gallons, and a 2.0 m deep 50 m pool holds about 660,430.
How big is an Olympic swimming pool?
For the Olympic Games and World Aquatics Championships, the February 2026 rules set a 50 m course, a minimum 25 m width for a permanent pool (26 m for a temporary one), and a minimum 2.5 m depth. Treating it as a rectangular prism gives 3,125 m³ or 3.125 million litres.
Why use Olympic pools as a unit?
Olympic pools are a familiar scale comparison, but the conversion should state its assumed capacity. On this page, 10 pools means 31.25 million litres using the February 2026 minimum dimensions.
How accurate is this conversion?
The arithmetic is exact for the stated 50 m × 25 m × 2.5 m rectangular reference. It is only an approximation for a real facility, which may be deeper and includes walls, gutters, touchpads and operating water levels.
What are some real-world examples?
One million litres is 0.32 of this reference pool; one billion litres is 320 pools. A full 3.125-million-litre pool contains about 3,125 metric tonnes of water before allowing for temperature and dissolved material.
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