US Gallons to Liters Converter
1 US gallon = 3.78541 liters
Converting us gallons to liters is a fundamental task in volume and capacity measurement. The US gallon (231 cubic inches) was defined by the US in 1832 and differs from the Imperial gallon. Today, 1 gal equals 3.78541 L, and this conversion is commonly needed in cooking and chemistry.
Conversion formula
liters = US gallons x 3.78541
To convert US gallons to liters, multiply by 3.78541. The US gallon is defined as 231 cubic inches, which equals 3.785411784 liters.
US Gallons to Liters Table
| US Gallons (gal) | Liters (L) |
|---|---|
| 0.5 | 1.89271 |
| 1 | 3.78541 |
| 2 | 7.57082 |
| 3 | 11.3562 |
| 5 | 18.9271 |
| 10 | 37.8541 |
| 15 | 56.7812 |
| 20 | 75.7082 |
| 50 | 189.271 |
| 100 | 378.541 |
About US Gallons to Liters
Converting US gallons to liters is essential for international fuel purchases, cooking, aquarium setup, and any liquid measurement crossing the metric-imperial divide.
Gas prices worldwide are listed per liter, except in the US where they are per gallon. If gas costs $3.50 per gallon in the US, that is about $0.92 per liter. When Europeans see $1.80/liter at their pumps, that is $6.81 per US gallon.
For aquarium enthusiasts, a 55-gallon fish tank holds 208.2 liters. A 10-gallon nano reef is 37.85 liters. Chemical dosing for aquariums (often in mL per liter) requires knowing the exact volume.
In homebrewing, a standard 5-gallon batch of beer is 18.93 liters. A corny keg holds 5 gallons (18.93 L), while a half-barrel commercial keg is 15.5 gallons (58.67 liters).
Water storage for emergency preparedness follows the rule of 1 gallon per person per day. For a family of four planning for 72 hours, that's 12 gallons (45.4 liters) of drinking water.
Paint coverage is often listed as one gallon covering 350-400 sq ft. That's 3.785 liters covering 32.5-37.2 m2 - useful when buying paint in metric countries.
For quick estimation, multiply gallons by 3.8 or simply by 4 and subtract 5%.
Frequently Asked Questions
How many liters in 1 gallon?
1 US gallon equals 3.785 liters. For Imperial (UK) gallons, 1 gallon = 4.546 liters.
How many liters of gas does a car hold?
Average US car fuel tanks hold 12-16 US gallons, which is 45-60 liters. Larger SUVs and trucks can hold 20-35 gallons (76-132 liters).
Is a gallon of water really 8 pounds?
Close - 1 US gallon of water weighs about 8.34 pounds (3.78 kg). The saying "a pint is a pound the world around" is approximate.
How many water bottles equal a gallon?
A standard water bottle is 500 mL (0.5 L). Since 1 gallon = 3.785 liters, you need about 7.57 standard bottles - roughly 8 water bottles per gallon.