US Gallons to Liters Converter
Select the gallon standard you are converting from or to
Enter the volume in gallons to convert to liters
Enter a Value to Convert
Type a gallon value above to instantly see the liter equivalent, formula, and related unit conversions.
How to Use the US Gallons to Liters Converter
Choose Conversion Direction and Gallon Type
Select whether you are converting from gallons to liters or from liters to gallons using the direction toggle at the top of the input panel. Then choose your gallon type: US Liquid Gallon (the standard American gallon, 3.7854 L), Imperial UK Gallon (used in the UK and Canada, 4.5461 L), or US Dry Gallon (historic unit for dry goods, 4.4049 L). The correct gallon type is essential for accurate results — the US and Imperial gallon differ by about 20%.
Enter Your Value
Type the volume you want to convert into the input field. The converter accepts decimal values — for example, 2.5 gallons or 10.75 liters. Results update automatically as you type, so there is no need to click a button. For single-direction quick conversions, this is all you need to do. The result and the formula are displayed immediately below the input.
Review the Formula and Related Units
Below the primary result, the Formula Used section shows the exact calculation — for example, '5 × 3.785412 = 18.9271 L' — so you can verify the math and understand how the conversion works. The Related Unit Conversions section also shows the equivalent in milliliters, fluid ounces, cubic feet, quarts, and pints. Use the precision selector to control decimal places: 2 for quick estimates, 4 for standard use, or 6 for scientific precision.
Use Batch Mode, Export, or Print
For converting multiple values at once, enable Batch Mode and enter comma-separated gallon values (e.g., 1, 5, 10, 25). All results appear in a table that you can export to CSV for spreadsheet use. The Copy Result button copies the primary converted value to your clipboard. Print Results opens a print-friendly view of your conversion with all details. The Quick Reference Table at the bottom provides a handy lookup for common conversions from 0.5 to 1,000 gallons.
Frequently Asked Questions
How many liters are in a US gallon?
One US liquid gallon is exactly 3.785411784 liters. This is the legally defined conversion factor established by the international yard and pound agreement of 1959. In everyday use, it is commonly rounded to 3.785 liters or 3.79 liters. To convert any number of US gallons to liters, multiply the gallon value by 3.785411784. For example, 5 US gallons equals 5 × 3.785411784 = 18.9271 liters. To convert in the reverse direction — liters to gallons — divide the liter value by 3.785411784, or equivalently multiply by 0.2641720524. For instance, 20 liters equals 20 ÷ 3.785411784 = 5.2834 US gallons.
What is the difference between a US gallon and an Imperial gallon?
The US liquid gallon and the Imperial (UK) gallon are two separate legal definitions of the gallon, and they differ by approximately 20%. One US liquid gallon equals 3.785411784 liters, while one Imperial gallon equals 4.54609188 liters — making the Imperial gallon about 1.201 times larger. This distinction matters enormously in real-world situations. For example, a car fuel economy rating of 30 miles per UK gallon is not the same as 30 US miles per gallon — the UK figure represents better fuel efficiency because each 'gallon' of fuel is larger. Fuel prices in Canada and the UK are listed per liter, while US prices are per gallon. Always identify which gallon standard is being used before comparing volumes or prices across countries to avoid significant errors.
How do I convert liters back to gallons?
To convert liters back to US liquid gallons, divide the liter value by 3.785411784, or multiply by 0.2641720524. For example, 10 liters equals 10 ÷ 3.785411784 = 2.6417 US gallons. To convert liters to Imperial gallons, divide by 4.54609188, or multiply by 0.2199691573 — so 10 liters equals 2.1997 Imperial gallons. To convert liters to US dry gallons, divide by 4.40488377. Our converter handles all these directions automatically — simply select 'Liters to Gallons' in the conversion direction toggle, choose your gallon type, and enter the liter value. The result, formula, and related unit conversions all update instantly.
What is a US dry gallon and when is it used?
The US dry gallon is a unit of volume historically used in the United States for measuring dry commodities such as grain, berries, apples, and other agricultural products. It is defined as exactly one-eighth of a US Winchester bushel, which equals 268.8025 cubic inches or 4.40488377 liters. The US dry gallon is approximately 16.4% larger than the US liquid gallon (3.785 L) and slightly smaller than the Imperial gallon (4.546 L). In modern commerce, the US dry gallon has largely been replaced by weight measurements for dry goods and is rarely encountered in everyday use. It remains legally defined by the National Institute of Standards and Technology (NIST) and may still appear in older agricultural records, commodity contracts, or specialized industry documents.
How accurate is this converter, and what precision should I use?
This converter uses the full internationally defined conversion factors: 3.785411784 L/US liquid gallon, 4.54609188 L/Imperial gallon, and 4.40488377 L/US dry gallon. These are exact legal definitions, not approximations, so the only source of error is the precision level you choose. For cooking and household use, 2 or 4 decimal places is more than sufficient. For scientific and engineering applications where cumulative rounding errors matter, use 6 decimal places. For commercial fuel delivery or industrial fluid handling where large volumes are involved, 6 decimal places (full precision) is recommended. The difference between using 3.79 and the full factor 3.785411784 may seem small for one gallon, but at 10,000 gallons the error amounts to approximately 46 liters — meaningful in any commercial context.
Why do gas prices seem cheaper in Canada or Europe when I compare them to US prices?
The apparent price difference is partly explained by the different volume units used. In Canada, the UK, and Europe, fuel is priced per liter. In the United States, it is priced per US gallon (3.785 L). When you see fuel priced at, say, 1.60 CAD per liter in Canada, the cost per US gallon equivalent would be approximately 1.60 × 3.785 = 6.06 CAD per US gallon. Additionally, many countries include fuel taxes, currency exchange differences, and different crude oil pricing in their local fuel prices, so a direct unit-adjusted comparison still involves other economic factors. The key takeaway is that you must always convert to the same volume unit before comparing fuel prices across countries — comparing dollars-per-gallon (US) directly to dollars-per-liter (Canada or Europe) without unit conversion will always give a misleading result.