Liters to Gallons Converter

The liters to gallons converter gives you instant, accurate results for both US and imperial gallons. Need to know how many gallons in a liter? Want to convert l to gal for fuel, water, or beverages? This tool handles the math in one step.

One liter is equal to 0.264172 US gallons, or 0.219969 imperial gallons. Because these two gallon standards differ by nearly 20%, it is important to know which one applies to your situation before you convert.

Liters to Gallons Formula

To convert liters to gallons (US), divide the liter value by 3.785411784:

US Gallons = Liters / 3.785411784

Example: Convert 20 liters to US gallons.

20 / 3.785411784 = 5.283 US gallons

To convert liters to imperial gallons, divide by 4.54609:

Imperial Gallons = Liters / 4.54609

Example: 20 liters / 4.54609 = 4.399 imperial gallons

Both conversion factors are defined by the National Institute of Standards and Technology (NIST). NIST is the authoritative source for unit definitions used in US measurement standards.

Liters to Gallons Conversion Chart

This liters gallons conversion chart covers the most commonly searched values for both US and imperial gallons. Use it as a quick reference without needing to run a calculation every time.

Gallons to Liters Conversion

To reverse the conversion and find how many liters in a gallon, multiply the gallon value by 3.785411784 (US) or 4.54609 (imperial):

Liters = US Gallons x 3.785411784

Example: 5 US gallons x 3.785411784 = 18.927 liters

Liters = Imperial Gallons x 4.54609

Example: 5 imperial gallons x 4.54609 = 22.730 liters

For the full reverse conversion tool, use DigiCalc's gallons to liters converter.

How Many Liters in 1 Gallon?

One US gallon equals exactly 3.785411784 liters. This is the standard 1 gallon to liter conversion used in the United States for all liquid measurements. People often ask: 1 gallon how many liters of water? The answer is 3.785 liters. So 1 gallon of water in liters is 3.785 L. One imperial gallon, used in the UK and some Commonwealth countries, equals 4.54609 liters, which is approximately 20% more than the US gallon.

1/2 Gallon in Liters

Half a US gallon equals 1.893 liters. A standard half-gallon milk jug holds exactly this amount. If working with imperial gallons, half an imperial gallon equals 2.273 liters, which is roughly 380 ml more than the US half-gallon equivalent. Always check which gallon standard applies when dealing with containers labeled in half-gallon sizes.

1.5 Gallon to Liter

1.5 US gallons equals 5.678 liters. This volume comes up frequently when sizing aquarium tanks, portable water jugs, and small fuel containers. A 1.5-gallon jug holds just over five standard 1-liter bottles. In imperial gallons, 1.5 gallons equals 6.819 liters, which is about 1.14 liters more than the US equivalent.

0.5 Gallon to Liter

0.5 gallon in liters equals 1.893 liters, the same as the half-gallon value. This measurement appears often in small appliance water tanks, humidifiers, and portable beverage containers. A 2-liter soda bottle holds slightly more than one 0.5-gallon container. For imperial measure, 0.5 imperial gallons equals 2.273 liters.

US Gallon vs Imperial Gallon: Key Differences

The US gallon and the imperial gallon are two distinct units of fluid measurement. Understanding the difference is essential for accurate liter to gallon conversion.

• US gallon: 3.785411784 liters. Used in the United States for fuel, beverages, and general liquid measurement.
• Imperial gallon: 4.54609 liters. Used historically in the United Kingdom and in some Commonwealth countries. Approximately 20% larger than the US gallon.

The two systems developed separately. The US gallon is based on the old English wine gallon (231 cubic inches). The imperial gallon was standardized in 1824 by the British Weights and Measures Act. It was defined as the volume of 10 pounds of water at a specific temperature.

This 20% difference has practical consequences:

• Fuel economy ratings: A vehicle at 40 miles per imperial gallon uses less fuel than one at 40 miles per US gallon. Both show the same number but represent different real-world volumes.
• Older recipes and instructions: Cooking guides or technical manuals from the UK may specify gallons that are imperial rather than US. Substituting the wrong value introduces a 20% error.
• Product imports: Industrial chemicals, lubricants, and liquids shipped internationally must specify US or imperial gallon to avoid measurement discrepancies in logistics and pricing.

For UK-specific imperial gallon conversions, use DigiCalc's dedicated liter to UK gallon converter.

Common Liters to Gallons Examples

Here are practical real-world examples of the liters to gallons conversion to put the numbers in context:

• Car fuel tank (50 liters): A typical mid-size car fuel tank holds around 50 liters, which equals 13.2 US gallons. Drivers accustomed to gallons can use this to estimate refueling costs when traveling abroad.
• Drinking water jug (19 liters): Standard office or home water dispensers use 19-liter (5-gallon) bottles. This is one of the most common liters to us gallons conversions globally.
• Aquarium (75 liters): A 75-liter fish tank holds approximately 19.8 US gallons. Most aquarium equipment, filters, and fish stocking guidelines use gallons in the US, so this conversion is needed regularly.
• Bathtub (150 liters): A standard bathtub holds roughly 150 liters of water, which equals 39.6 US gallons. This context helps when calculating water usage and utility costs.
• Beverage bottle (2 liters): A standard 2-liter soda bottle holds 0.528 US gallons, just over half a gallon.

Liters to Gallons in Different Measurement Systems

The liter is the standard unit of volume in the International System of Units (SI), used by most countries worldwide. The gallon is a non-SI unit used primarily in the United States (US gallon) and, less commonly, in some Commonwealth contexts (imperial gallon).

Countries that use the metric system exclusively, such as most of Europe, Asia, Africa, and South America, measure liquid volume in liters and milliliters. The US remains one of the few countries that uses gallons as the primary fluid volume unit in everyday commerce, fuel pricing, and household products.

This makes converting liters to gallons one of the most frequent volume conversions globally. It is especially relevant for travelers, importers, and anyone working across US and non-US measurement standards. The fluid measurement difference affects everyday tasks: comparing fuel economy, buying beverages, and measuring fluid volume in industrial contexts.

For all volume unit conversions including milliliters, cups, pints, quarts, and more, use DigiCalc's volume converter.

Limitations of This Converter

This liters to gallons calculator (convert l to gal) converts liquid volume only. It does not handle dry gallons, which are a separate US measurement unit used for certain dry goods (1 US dry gallon = 4.405 liters). If you are measuring grains, flour, or other dry materials in gallons, the liquid gallon conversion will give an incorrect result.

All results are rounded to three decimal places. For higher precision, use the full conversion factors: 3.785411784 liters per US gallon and 4.54609 liters per imperial gallon. These are defined by NIST and the International Bureau of Weights and Measures (BIPM).

This tool also does not account for temperature-based volume changes. Liquids expand and contract with temperature. For highly precise fluid measurement in engineering contexts, volume should be measured at a standard reference temperature, typically 15 degrees Celsius or 60 degrees Fahrenheit.