Convert US Gallons to Litres | Free Australian Volume Converter
Convert US gal to l as you type.
Volume Converter – Instant Metric & Cooking ConversionsReference for one unit; displayed values may be rounded.
US Gallons
Use a dot or comma for decimals, without thousands separators.
Liters
Display rounding does not improve the accuracy of your original measurement. Very large or very small results use scientific notation.
Method and sourcegal to L Conversion Formula
To convert US gallons to litres, multiply the gallon value by 3.78541. This converts US liquid gallons — the unit you'll find on American fuel bowsers, US product labels, and imported equipment spec sheets. The UK (imperial) gallon is larger at 4.54609 litres.
US Gallons and Liters Explained
US Gallons (US gal)
The US liquid gallon is the volume standard of the United States, defined as exactly 3.78541 litres — the old English wine gallon of 231 cubic inches. It splits into 4 quarts, 8 pints, or 128 fluid ounces, and a full gallon of water weighs about 3.78 kilograms. Fuel bowsers, milk packaging, paint tins, and pool chemical labels across America all count in these gallons.
Where it is used: Dominant in the United States and still common in Liberia, Belize, and several Caribbean countries for fuel and everyday liquids.
Origin: English statute fixed the wine gallon at 231 cubic inches in 1707; the newly independent US kept it in 1776-era custom while Britain redefined its gallon in 1824.
Liters (l)
The litre (L) is the metric unit of volume, equal to one cubic decimetre — imagine a cube 10 cm on every side. Australia, like nearly every country outside the US, prices fuel, bottles drinks, and labels engine fluids in litres. It takes about 3.78541 litres to fill one US gallon, and a litre of water weighs almost exactly one kilogram, which is how the unit was first conceived.
Where it is used: The default liquid measure for fuel, beverages, cooking, science, and industry across Australia, New Zealand, Europe, Asia, Africa, and the Americas.
Origin: Born with the French metric system in the 1790s as the volume of one kilogram of water; redefined in 1964 as exactly 1,000 cubic centimetres.
US Gallons to Litres Conversion Table
Select a value to use it in the calculator.
| US Gallons (US gal) | Liters (l) |
|---|---|
| 1.892705 l | |
| 3.78541 l | |
| 7.57082 l | |
| 11.35623 l | |
| 18.92705 l | |
| 37.8541 l | |
| 49.21033 l | |
| 75.7082 l | |
| 98.42066 l | |
| 113.5623 l | |
| 151.4164 l | |
| 208.19755 l | |
| 378.541 l | |
| 757.082 l | |
| 1892.705 l |
Liters to US Gallons Conversion Table
| Liters (l) | US Gallons (US gal) |
|---|---|
| 1 l | 0.2641721769 US gal |
| 2 l | 0.5283443537 US gal |
| 5 l | 1.3208608843 US gal |
| 10 l | 2.6417217686 US gal |
| 20 l | 5.2834435372 US gal |
| 50 l | 13.2086088429 US gal |
| 100 l | 26.4172176858 US gal |
| 208.2 l | 55.0006472218 US gal |
| 500 l | 132.086088429 US gal |
| 1000 l | 264.172176858 US gal |
US Gallons to Liters in Everyday Objects
Common real-world examples that make US Gallons and Liters easy to picture at a glance.
| US Gallons (US gal) | Liters (l) | |
|---|---|---|
| Gallon jug of milk | 1 US gal | 3.78541 l |
| Five-gallon paint bucket | 5 US gal | 18.92705 l |
| Kitchen bin | 13 US gal | 49.21033 l |
| Fifty-five-gallon drum | 55 US gal | 208.19755 l |
| Backyard spa | 350 US gal | 1324.8935 l |
| 4WD fuel tank | 26 US gal | 98.42066 l |
When You Need US Gallons to Liters Conversions
Servicing machinery from oil drums
Workshop manuals written in the US specify lubricant deliveries per 55-gallon drum, but your Australian supplier invoices by the litre. Converting 55 US gal to 208.20 L keeps reorder quantities, fluid inventories, and waste-disposal paperwork aligned on both systems.
Dosing a backyard pool from US-gallon figures
Pool volume calculators on American websites report gallons, while chlorine and algaecide from your local pool shop are dosed per litre or per 10,000 L. A 12,000 US gal pool is 45,424.92 L — running that figure through the converter before chemical day prevents a costly dosing error on a 40°C Perth or Brisbane summer weekend.
Fuelling a boat, 4WD, or imported pickup
Your imported pickup's 26-gallon tank reads 98.42 L at the servo — worth knowing before a Big Lap road trip, where diesel is sold by the litre at every bowser. Converting tank capacity first tells you exactly how many litres a fill-up takes and whether the jerry cans in the tray match the pump's pricing unit.
Mixing agricultural sprayer batches
A 40 US gal sprayer tank equals 151.42 L, and herbicide labels list rates per hectare or per 100 L. Converting the tank to litres before mixing keeps concentrate ratios correct when the product sheet is metric but the imported equipment dial is in gallons.
Related Volume Conversions
How to Use
-
1
Enter Your Volume in Gallons
Type the US gallon value — for example, enter 5 for a jerry can, 26 for an imported ute's fuel tank, or 55 for an oil drum
-
2
See the Litre Equivalent
The result appears instantly: 5 US gal = 18.93 L, so you can dose chemicals or order fluids in Australian metric packaging without guesswork
-
3
Copy or Reverse
Copy the result or click Swap to convert litres back to US gallons
-
4
Check the Table
Browse the conversion table for common values like 13 gal = 49.21 L or 30 gal = 113.56 L
Why Use Be Converter?
Instant Conversion
Get precise US gallon to litre results in real time as you type — from a 1 gal jerry can (3.79 L) to a 350 gal backyard spa (1,324.89 L)
Exact US Definition
Uses the exact US liquid gallon of 3.78541 litres (231 cubic inches) — and flags the larger UK gallon (4.54609 L) so specs on imported American gear never trip you up
Handy Reference Table
Common values at a glance — 5 gal = 18.93 L, 20 gal = 75.71 L, and the classic 55 gal oil drum = 208.20 L
Swap with One Click
Flip the pair instantly to turn metric quantities back into gallons — a 1,000 L rainwater tank becomes 264.17 US gal
Free & Unlimited
No registration required. Convert drums, tanks, and jerry cans of any size as often as you need — always free
Completely Private
All calculations run locally in your browser. Your fuel and fluid volumes never leave your device
Frequently Asked Questions
How many litres are in 1 US gallon?
How do I convert gallons to litres?
What is 5 gallons in litres?
Is a US gallon the same as a UK gallon?
Is a gallon bigger than a litre?
How many litres is a 55-gallon drum?
How many litres is a 20-gallon aquarium?
How many litres is a 30-gallon hot water system?
About Our US Gallons to Litres Converter
Our free online US gallons to litres converter gives Australians instant, accurate volume conversions from the American gallon to the metric litre. Whether you're servicing imported US machinery, filling a 4WD, caravan, or boat tank built to American specs, dosing a backyard pool, or checking a rainwater tank listed in gallons, this tool delivers reliable results. Australia has been fully metric for decades — fuel is pumped in litres at the bowser and pool chemicals are dosed per 10,000 litres — yet plenty of manuals, spec sheets, and online calculators still speak in US gallons. Our converter applies the exact US definition of 3.78541 litres and clearly separates it from the larger UK imperial gallon (4.54609 litres) so your conversions stay correct on every document.
Expert Tips for gal to L Conversion
The exact conversion is 1 US gal = 3.78541 L, because the US gallon is defined as 231 cubic inches and one inch is exactly 25.4 mm.
For mental maths, treat a gallon as 3.8 litres. Ten gallons becomes 38 L versus the exact 37.85 L — off by only 0.4%, fine for a quick check at the hardware store.
Watch UK and older Commonwealth sources: an imperial gallon (4.54609 L) is about 1.2 US gallons. British fuel economy figures in "mpg (imp)" must be converted with the larger gallon, or your numbers will be 20% optimistic.
Bulk logistics run on drums: one 55 US gal drum is 208.20 L, so a pallet of four drums carries 832.8 L — the figure your freight forwarder's metric quotes will expect.
Pool calculators from US sites output gallons; Australian pool shops dose chemicals per 10,000 litres. A 12,000 gal pool is 45,424.92 L — using the gallon figure against a per-litre dose would overshoot badly on a 40°C summer day.
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