Liters to Gallons Converter

How to Use This Calculator

1. Enter the volume value.
2. Select the conversion direction (liters to US gallons, US gallons to liters, etc.).
3. Click Calculate to see the result.
4. Use the Extended tabs for full US or UK unit breakdowns, or the Quick Table.

Formula

Example

Frequently Asked Questions

• How many liters are in a US gallon? ▼
  1 US gallon equals exactly 3.785411784 liters (approximately 3.785 L). Conversely, 1 liter = 0.264172 US gallons. This exact value derives from the US gallon's historical definition of 231 cubic inches, combined with the conversion 1 cubic inch = 16.387064 ml. Common conversions: 1 US gal = 3.785 L; 5 gal = 18.93 L; 10 gal = 37.85 L; 20 gal = 75.71 L. In fuel context: a typical car fuel tank holds 50–75 liters = 13.2–19.8 US gallons. US gas prices in dollars per gallon can be converted to price per liter by dividing by 3.785. One US gallon = 4 US quarts = 8 US pints = 128 US fluid ounces.
• How many liters are in a UK gallon? ▼
  1 UK (imperial) gallon equals exactly 4.54609 liters — about 20% more than a US gallon (3.785 L). Conversely, 1 liter = 0.219969 UK gallons. The UK gallon was defined in the British Weights and Measures Act of 1824 as the volume occupied by 10 pounds of water at 62°F (16.67°C). Common conversions: 1 UK gal = 4.546 L; 5 UK gal = 22.73 L; 10 UK gal = 45.46 L. This size difference matters significantly for fuel economy: a car achieving 40 UK MPG gets the equivalent of only 33.3 US MPG — the same car, same efficiency, different numbers. UK fuel is sold in liters at the pump, but many older British people still think in gallons. 1 UK gallon = 8 UK pints = 160 UK fluid ounces.
• Why are US and UK gallons different? ▼
  The US gallon and the UK (imperial) gallon share a common historical ancestor but diverged due to separate standardization. Both trace back to pre-metric British units, but the US gallon was fixed at 231 cubic inches by British Queen Anne's wine gallon statute of 1707 — the US adopted this as their standard after independence. The UK then redefined the imperial gallon in 1824 under the Weights and Measures Act as the volume of exactly 10 pounds of water at 62°F, which comes to about 277.42 cubic inches = 4.546 L. This is significantly larger than the US wine gallon (231 cu in = 3.785 L). The US dry gallon (used for grain) = 268.8 cubic inches = 4.405 L — a third, rarely used variant. Always specify "US" or "UK" when the context is ambiguous.
• How do I convert liters to fluid ounces? ▼
  1 liter equals 33.8140 US fluid ounces or 35.1951 UK fluid ounces. To convert liters to US fluid ounces, multiply by 33.814. To convert liters to UK fluid ounces, multiply by 35.195. The difference arises because a US fluid ounce = 29.5735 ml while a UK fluid ounce = 28.4131 ml. Common conversions (US fl oz): 0.5 L = 16.91 fl oz; 1 L = 33.81 fl oz; 1.5 L = 50.72 fl oz; 2 L = 67.63 fl oz. A standard 1.5 L bottle of water contains about 50.7 US fluid ounces. A US 12 fl oz soda can contains 354.88 ml ≈ 0.355 L. Note: fluid ounces measure volume while weight ounces measure mass — they are not interchangeable except approximately for water.
• How many gallons is a 20-liter fuel can? ▼
  20 liters equals 5.283 US gallons or 4.399 UK gallons. A standard NATO jerry can (military fuel can) holds 20 liters = 5.28 US gallons. These metal cans became standard during World War II and are still widely used for fuel transport. Other common container conversions: 5 L = 1.321 US gal; 10 L = 2.642 US gal; 25 L = 6.604 US gal. When buying fuel for generators, boats, or lawnmowers in the US (where fuel is measured in gallons), knowing that 20 liters ≈ 5.3 gallons helps estimate how many cans are needed. For UK fuel prices: a 20 L can at £1.60/L costs £32 total; at US equivalent pricing ($5/US gallon), the same 20 L would cost about $26.40.

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