Instantly Convert Australian Gallons ↔ Litres — Both Directions
Convert gallons (AU) to litres or litres to gallons (AU) instantly. Get the exact conversion with formula breakdown, reference table, and real-world examples — all free, no sign-up needed.
The Australian gallon is identical to the Imperial gallon and equals exactly 4.54609 litres. Our converter handles both directions instantly and accurately using the exact internationally defined conversion factor — no rounding, no guesswork.
The Australian gallon is the same as the Imperial gallon, historically used in Australia before the country adopted the metric system in the 1970s. One Australian (Imperial) gallon equals exactly 4.54609 litres, defined under the Weights and Measures Act. While Australia now officially uses litres, the gallon still appears in older documents, fuel efficiency references, and cross-regional comparisons.
The litre (L) is a metric unit of volume widely used across Australia and the world for measuring liquids including water, fuel, and beverages. One litre equals 1,000 millilitres or 1 cubic decimetre (dm³). Since Australia's metrication in the 1970s, the litre has been the standard unit for all liquid measurement — from fuel pricing at the pump to food packaging.
The exact conversion factor is 1 gallon (AU) = 4.54609 litres, established by international definition. For the reverse, 1 litre = 0.219969 gallons (AU) (= 1 ÷ 4.54609). Note: this is different from the US gallon (1 US gal = 3.78541 L). All conversions on this page use the exact Imperial/Australian gallon value.
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Figure: Volume comparison — 1 Australian (Imperial) gallon vs 1 litre vs 1 US gallon
The conversion between Australian gallons and litres uses the exact Imperial gallon definition. The Australian gallon = Imperial gallon = exactly 4.54609 litres, as defined under the international standard. This is not an approximation — both formulas below are mathematically exact. Need other volume conversions? Browse our full converter library at ConcreteMetric.
The table below lists commonly needed Australian gallon-to-litre conversions. All values use the exact factor of 1 gal (AU) = 4.54609 L. For litres to gallons, divide by 4.54609 or use the converter above.
| Gallons (AU) | Litres (L) | Millilitres (mL) | US Gallons | Common Context |
|---|---|---|---|---|
| 0.5 gal | 2.27305 L | 2273.05 mL | 0.6003 US gal | Small water bottle (×2) |
| 1 gal | 4.54609 L | 4546.09 mL | 1.2009 US gal | Standard Imperial gallon |
| 2 gal | 9.09218 L | 9092.18 mL | 2.4019 US gal | Small fuel container |
| 3 gal | 13.6383 L | 13638.3 mL | 3.6028 US gal | Garden watering can |
| 5 gal | 22.7305 L | 22730.5 mL | 6.0047 US gal | Small jerrycan |
| 10 gal | 45.4609 L | 45460.9 mL | 12.009 US gal | Standard jerrycan (approx.) |
| 15 gal | 68.1914 L | 68191.4 mL | 18.014 US gal | Large fuel drum (small) |
| 20 gal | 90.9218 L | 90921.8 mL | 24.019 US gal | Small water tank |
| 25 gal | 113.652 L | 113652 mL | 30.023 US gal | Medium aquarium |
| 50 gal | 227.305 L | 227305 mL | 60.047 US gal | Large aquarium / drum |
| 100 gal | 454.609 L | 454609 mL | 120.09 US gal | Large water tank |
| 200 gal | 909.218 L | 909218 mL | 240.19 US gal | Industrial storage |
| 500 gal | 2273.05 L | 2273050 mL | 600.47 US gal | Commercial tank |
| 1000 gal | 4546.09 L | 4546090 mL | 1200.9 US gal | Large industrial storage |
The table below shows common litre values converted to Australian (Imperial) gallons. All values use the exact factor of 1 L = 0.219969 gallons (AU). This is helpful when reading modern metric fuel or water volumes and needing to reference older Imperial gallon records.
| Litres (L) | Gallons (AU) | Pints (Imperial) | US Gallons |
|---|---|---|---|
| 1 L | 0.21997 gal | 1.7598 pt | 0.26417 US gal |
| 2 L | 0.43994 gal | 3.5195 pt | 0.52834 US gal |
| 5 L | 1.09985 gal | 8.7988 pt | 1.32086 US gal |
| 10 L | 2.19969 gal | 17.598 pt | 2.64172 US gal |
| 20 L | 4.39938 gal | 35.195 pt | 5.28344 US gal |
| 25 L | 5.49923 gal | 43.994 pt | 6.60430 US gal |
| 50 L | 10.9985 gal | 87.988 pt | 13.2086 US gal |
| 100 L | 21.9969 gal | 175.98 pt | 26.4172 US gal |
| 200 L | 43.9938 gal | 351.95 pt | 52.8344 US gal |
| 500 L | 109.985 gal | 879.88 pt | 132.086 US gal |
| 1000 L (1 kL) | 219.969 gal | 1759.8 pt | 264.172 US gal |
Even though Australia officially metricated in the 1970s, the Australian (Imperial) gallon still appears in a wide range of practical and historical contexts in 2026. Here are the most common real-world scenarios where this conversion is needed.
Older Australian vehicle specifications, vintage car guides, and pre-metric fuel consumption figures are often quoted in miles per gallon or kilometres per gallon (AU). Converting these to the modern Australian standard of litres per 100 km requires knowing that 1 AU gallon = 4.54609 L. This conversion is common among classic car enthusiasts and historians.
Australian farming records, irrigation manuals, and water usage logs from before the 1970s metrication era frequently reference gallons. Tank capacities, spray volumes, and water allocations may still appear in gallons in older property documentation. Converting 500 gallons = 2,273 litres is a routine task for rural landowners reviewing historical water usage data.
Fuel capacity, ballast water, and cargo liquid volumes on older vessels and maritime records in Australia may reference Imperial gallons. Modern shipping uses cubic metres and litres, so converting historical logs and legacy technical documents is essential for marine engineers, surveyors, and port authorities working with older fleet data.
Many older Australian homes have rainwater tanks with capacities stamped in gallons from the pre-metric era. A common tank size of 500 gallons = 2,273 litres, and 1,000 gallons ≈ 4,546 litres. Homeowners checking old tank specifications or comparing with modern litre-rated tanks frequently need this conversion for water planning and compliance purposes.
A common source of confusion is the difference between the Australian (Imperial) gallon and the US gallon. The AU gallon is approximately 20% larger than the US gallon: 1 AU gal = 4.54609 L vs 1 US gal = 3.78541 L. Australians buying US products, reading American recipes, or comparing US fuel economy figures must account for this important difference.
Australian historical records, colonial-era accounts, early 20th-century industrial reports, and pre-1974 government publications all use Imperial gallons. Researchers, archivists, and historians converting these volume figures to modern litres for analysis, publication, or comparison with contemporary data use this exact conversion regularly.
The ABS provides official Australian measurement standards, historical metrication data, and statistical references including the transition from Imperial gallons to litres during Australia's metrication program of the 1970s.
Visit ABS →The Bureau International des Poids et Mesures (BIPM) is the international body responsible for defining SI units including the litre. Their resources cover official unit definitions and the international relationship between Imperial and metric units.
Visit BIPM →The UK government provides official documentation on Imperial units including the gallon — the same definition used historically in Australia. Useful for understanding the exact legal definition of 4.54609 litres per gallon.
Visit UK Gov →The National Institute of Standards and Technology (NIST) provides clear documentation on the difference between US and Imperial (Australian) gallons — essential reading for anyone comparing volume measurements across US and Australian/UK systems.
Visit NIST →