Liters to Gallons Converter

Liters to gallons: convert volume in seconds

To convert liters to gallons, divide the number of liters by 3.785411784 for US gallons, or by 4.54609 for UK (imperial) gallons. So 1 liter is about 0.264 US gallons, and 10 liters is roughly 2.64 US gallons. This converter does the arithmetic the moment you type, and it works in both directions, so it doubles as a gallons to liters converter whenever you need to flip the math.

Liters are the metric measure of volume used across most of the world, while gallons are common in the United States and, in a slightly larger form, the United Kingdom. That split makes liters to gallons one of the most-needed conversions for fuel economy, recipes, aquariums, fuel tanks and shipping. Because the US gallon and the imperial gallon are different sizes, this page keeps them clearly separate so your answer is never off by a fifth.

The two gallons have separate histories. The US liquid gallon is defined as 231 cubic inches, which works out to 3.785 liters. The imperial gallon was originally based on the volume of ten pounds of water and settled at 4.546 liters. They have never been the same size, and the gap is large enough to matter: an imperial gallon holds about 20 percent more than a US gallon. That is why a converter liters to gallons must always make clear which gallon it is reporting, and why this page shows both side by side. Whether you reach for a converter gallons to liters or the reverse, naming the gallon is the first step.

How to use this liters to gallons converter

1. Type the volume in liters into the field. Decimals like 18.5 work fine.
2. Read the gallon result instantly. Use the US gallon figure unless you specifically need the UK imperial value.
3. To reverse the direction, switch to the Gallons to Liters Converter and enter a gallon amount instead.
4. Copy the number into your recipe, logbook, or spreadsheet.

The tool runs entirely in your browser, so it keeps working offline once loaded and never sends your figures anywhere. That makes it a quick check at the pump, in the garage, or at the kitchen counter.

Liters to gallons formula and a worked example

The conversion is a simple division by a fixed factor, with one factor for each kind of gallon:

• US gallons = liters ÷ 3.785411784
• UK (imperial) gallons = liters ÷ 4.54609

To go the other way, multiply gallons by the same factor: liters = US gallons × 3.785411784. That is exactly what the gallons to liters converter does.

Worked example: convert 20 liters to US gallons. Divide 20 by 3.785411784 to get 5.28 US gallons. In imperial gallons, 20 liters is 20 ÷ 4.54609 = 4.40 UK gallons. The same 20 liters gives two different gallon figures, which is why naming the gallon type matters.

A second example runs the popular search the other way. People often ask what 5 gallons is in liters. For US gallons, multiply 5 by 3.785411784 to get 18.93 liters, the size of a typical fuel or water carrier. For imperial gallons, 5 × 4.54609 = 22.73 liters. The same procedure answers 1 gallon to liters (3.79 L US), 2 gallons to liters (7.57 L US), and 3 gallons to liters (11.36 L US): just multiply by the factor for the gallon you mean. A gallons to liters converter calculator simply automates that multiplication for any number you type.

Larger volumes follow the identical rule. To handle 25 gallons to liters, multiply 25 by 3.785 for 94.64 liters; for 36 gallons to liters, multiply 36 by 3.785 for 136.27 liters. Nothing about the method changes with size, which is what makes a single liters to gallons converter calculator reliable across drums, tanks and small bottles alike.

Common gallons and liters conversions

Many searches start from a round number of gallons, so this reference table runs the popular gallon amounts the other way. It is handy when a tank, drum or recipe is rated in gallons but you think in liters.

For specialist needs the same method applies. Converting Canadian liters to US gallons, for instance, uses the US factor of 3.785 because a Canadian gallon is the imperial gallon; just be clear which gallon the source figure assumes before you divide. The same care applies to a liters to Canadian gallons converter: there you divide by 4.546, the imperial factor, because Canada inherited the UK gallon.

Fuel economy and everyday volumes

One of the most common reasons to convert liters and gallons is fuel. A car that holds 50 liters of fuel has a tank of about 13.2 US gallons or 11 imperial gallons. Fuel economy figures cross the same divide: a rate quoted in liters per 100 km can be turned into miles per gallon, but only after you decide whether the gallon is US or imperial, because the two give different mpg numbers for the same car. A specialised liters per km to gallons mile converter exists for exactly this reason, but the core step is always the simple division shown above.

Cooking and home use add more examples. A large stockpot might be 8 liters, just over 2 US gallons. An aquarium rated at 200 liters holds about 52.8 US gallons, a figure that matters when you dose water treatments sold per gallon. In each case the same factor does the work; only the context changes.

Common mistakes when converting liters to gallons

• Mixing US and UK gallons. The imperial gallon is about 20 percent larger than the US gallon. Using the wrong one is the single biggest source of error, so always state which gallon you mean.
• Reversing the operation. Liters to gallons is division; gallons to liters is multiplication. Multiplying liters by 3.785 instead of dividing gives a wildly inflated answer.
• Assuming a gallon is exactly 4 liters. A US gallon is 3.785 liters, not 4. The rough rounding adds up on large volumes like fuel tanks.
• Ignoring the source country. Fuel economy and tank sizes quoted in gallons may be US or imperial depending on the region. Check before converting.
• Over-rounding mid-calculation. Keep the full factor and round only the final gallon figure for accuracy.

Tips and related converters

A fast estimate: a US gallon is just under 4 liters, so divide liters by roughly 3.8 in your head, or multiply gallons by about 3.8 to go back. For imperial gallons, use 4.5 instead. Those anchors let you sanity-check the exact result the converter gives you. When precision matters, such as dosing or fuel logging, keep three decimal places. A useful habit is to write the gallon type next to every figure, for example "18.9 L (US)", so that a number copied later cannot be misread as the wrong gallon.

If you work across regions, decide once which gallon your project uses and stick to it for the whole job. Switching between US and imperial halfway through a set of conversions is the fastest way to introduce an error that is hard to spot afterwards, because each individual number still looks plausible.

This liters to gallons converter is part of a broader measurement toolkit. Reverse it with the Gallons to Liters Converter, and for other quantities try the Weight Converter, the Temperature Converter, or the Power Converter. Browse them all on the Unit Converters hub, free and without an account.

Frequently asked questions

How do I convert liters to gallons? Divide the number of liters by 3.785411784 for US gallons, or by 4.54609 for UK imperial gallons. The converter above does it instantly.

How many liters are in 1 gallon? A US gallon is 3.785 liters and a UK imperial gallon is 4.546 liters.

How many gallons is 5 liters? Five liters equals about 1.32 US gallons or 1.10 UK gallons.

What is the difference between US and UK gallons? The imperial (UK) gallon is about 20 percent larger than the US gallon, so always check which one a figure refers to before converting.

Is a gallon 4 liters? Not quite. A US gallon is 3.785 liters and an imperial gallon is 4.546 liters; treating either as exactly 4 introduces error.

How do I convert gallons back to liters? Multiply US gallons by 3.785411784, or imperial gallons by 4.54609. The reverse-direction Gallons to Liters Converter linked above does this for you.

Which gallon does a Canadian figure use? Canada uses the imperial gallon, so to convert Canadian liters to US gallons you still divide liters by 3.785; only the gallon definition you are comparing against changes.

Does the converter work offline? Yes. After the page loads it runs in your browser and never sends your numbers anywhere, so it works without a connection.