US gallons to liters
L = gal × 3.785411784
Exact factor, from 1 US gal = 231 in³ and 1 in = 2.54 cm.
Convert liters to US gallons (and US gallons to liters)
Two-way liters ↔ US gallons converter: exact factor (1 US gallon = 3.785411784 L), formula, the difference from the UK gallon, a mental-math shortcut and real examples (gas prices, fuel tanks, mpg to L/100 km).
Conversion table
| L | gal US |
|---|---|
| 1 L | 0.2642 gal US |
| 2 L | 0.5283 gal US |
| 5 L | 1.32086 gal US |
| 10 L | 2.64172 gal US |
| 20 L | 5.28344 gal US |
| 50 L | 13.2086 gal US |
| 100 L | 26.4172 gal US |
| 1,000 L | 264.172 gal US |
| gal US | L |
|---|---|
| 1 gal US | 3.78541 L |
| 2 gal US | 7.57082 L |
| 5 gal US | 18.9271 L |
| 10 gal US | 37.8541 L |
| 20 gal US | 75.7082 L |
| 50 gal US | 189.271 L |
| 100 gal US | 378.541 L |
| 1,000 gal US | 3,785.41 L |
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How does this tool work?
This converter turns liters into US gallons and US gallons into liters: type a value in either field and the other updates instantly. It helps you read a fuel price quoted per liter abroad, compare a car's tank size or a jug of antifreeze with a metric label, translate miles per gallon (mpg) into L/100 km, or adapt a product spec or recipe written in the other unit.
The US gallon used here is the liquid gallon, defined as 231 cubic inches. Since 1 inch is exactly 25.4 mm, 1 US gal = 231 × 16.387064 mL = 3,785.411784 mL, which is exactly 3.785411784 L (NIST SP 811). It follows that 1 L ≈ 0.264172 US gal. The liter itself is exactly 1 dm³.
To convert liters to US gallons, divide by 3.785411784 (or multiply by 0.264172); to convert gallons to liters, multiply by 3.785411784. For fuel economy the relation is L/100 km = 235.2146 ÷ mpg (US): 30 mpg is 7.84 L/100 km.
In your head, a gallon is "almost 4 liters": multiply gallons by 4 and take off 5% (10 gal → 40 − 2 = 38 L, exact value 37.85). The other way, divide liters by 4 and add 6% (40 L → 10 + 0.6 = 10.6 gal, exact value 10.57).
Do not confuse the US gallon with the British imperial gallon, which is 4.54609 L, about 20% larger: a UK "30 mpg" is a noticeably lower fuel consumption than a US 30 mpg. There is also a US dry gallon (about 4.405 L), used for grain and produce, which you will not meet at the pump.
How to use this tool
Enter a volume
Use the Liters or the US gallons field; decimals are accepted, for example 12.5 gal.
Read the exact conversion
The other field updates as you type; round to two decimals for a price or a fill-up, to a whole number for a rough idea.
Use the table
The table under the converter lists common values (1, 2, 5, 10, 20, 50, 100 and 1,000) in both directions, handy for typical fill-ups of 10 to 20 gallons.
Liters ↔ US gallons conversion formulas
The US liquid gallon is defined in cubic inches, so it is tied exactly to the meter.
Liters to US gallons
gal = L ÷ 3.785411784 ≈ L × 0.264172
The 0.264172 factor is rounded to the millionth.
mpg (US) to L/100 km
L/100 km = 235.2146 ÷ mpg
Derived from 100 × 3.785411784 ÷ 1.609344.
- L
- volume in liters (1 L = 1 dm³)
- US gal
- volume in US liquid gallons (1 US gal = 231 in³)
- mpg
- miles per US gallon
Example: 15 US gal = 15 × 3.785411784 ≈ 56.78 L; and 50 L = 50 ÷ 3.785411784 ≈ 13.21 US gal.
Use cases
Travel and car rental
Compare a fuel price shown per gallon with the per-liter prices used in most of the world.
Fuel economy
Turn a spec sheet in miles per gallon into L/100 km, and the other way round.
Online shopping
Convert the capacity of products sold by the gallon: paint, antifreeze, washer fluid, oil jugs, drums.
Cooking and DIY
Adapt recipes, paint mixes or cleaning-product dilutions given in gallons or quarts (1 gal = 4 quarts).
Examples
One gallon in liters
1 × 3.785411784 = 3.7854 L, the value to remember.
Input
1 US galResult
3.785 LA 15-gallon tank
15 × 3.785411784 = 56.78 L, a typical sedan tank.
Input
15 US galResult
56.78 LA 50-liter fill-up
50 ÷ 3.785411784 ≈ 13.209 US gallons.
Input
50 LResult
13.21 US galGas price per gallon
3.50 ÷ 3.785411784 ≈ $0.9246 per liter; apply the exchange rate to compare with a price in euros or pounds.
Input
$3.50 per gallonResult
$0.92 per literFuel economy of 30 mpg
100 × 3.785411784 ÷ (30 × 1.609344) = 7.84 L per 100 km.
Input
30 mpg (US)Result
7.84 L/100 kmTips and best practices
- Quick reference: 1 US gal ≈ 3.79 L, 5 gal ≈ 18.9 L and 10 gal ≈ 37.9 L; 1 L ≈ 0.264 gal.
- A US gallon holds 4 quarts, 8 pints or 128 US fluid ounces; one quart (qt) is 0.946 L.
- For fuel economy use L/100 km = 235.2146 ÷ mpg: the higher the mpg, the lower the consumption in liters.
- Always check whether a source is American (3.785 L) or British (4.546 L): the gap is 20%.
Sources and references
- NIST, Guide for the Use of the International System of Units (SP 811), Appendix B.8: Factors for Units Listed Alphabetically (opens in a new tab)Page in English
- BIPM, The International System of Units (SI Brochure) (opens in a new tab), Bureau international des poids et mesuresPage in English
Frequently asked questions
How many liters are in a US gallon?
One US (liquid) gallon is exactly 3.785411784 L, about 3.79 L. It is defined as 231 cubic inches.
How do I convert liters to US gallons?
Divide the liters by 3.785411784, or multiply by 0.264172. For example, 40 L is about 10.57 US gallons and 100 L about 26.42 gallons.
How do I convert US gallons to liters?
Multiply the gallons by 3.785411784. For example, 12 gallons is about 45.42 L and 26 gallons about 98.42 L.
What is the difference between a US gallon and a UK gallon?
The US gallon is 3.785 L and the British imperial gallon 4.546 L: the UK gallon is about 20% larger (1 UK gal ≈ 1.2009 US gal).
How do I convert mpg to L/100 km?
Divide 235.2146 by the figure in US mpg: 25 mpg gives 9.41 L/100 km and 40 mpg gives 5.88 L/100 km. For UK mpg the numerator is 282.481.
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