Gallons to Liters Converter
Convert US gallons to liters instantly with our free online calculator. Essential for fuel economy comparisons, cooking conversions, aquarium volumes, and international recipes.
Conversion Formula
| Conversion | Formula | Example | US gal to Lgal × 3.7854110 gal = 37.85 L L to US galL ÷ 3.7854137.85 L = 10 gal UK gal to Lgal × 4.5460910 gal = 45.46 L
US vs Imperial Gallon
TypeLitersDifference US Gallon3.78541 LStandard in USA UK/Imperial Gallon4.54609 L20% larger
Important: This converter uses US gallons. UK/Imperial gallons are approximately 20% larger.
Quick Reference Table
US GallonsLitersCommon Use 1 gal3.79 LMilk jug 2.5 gal9.46 LSmall container 5 gal18.93 LJerry can 10 gal37.85 LAquarium 15 gal56.78 LCar fuel tank 20 gal75.71 LLarge tank 55 gal208.2 LStandard drum
Fuel Economy Conversion
Converting MPG to L/100km:
MPG (US)L/100kmEfficiency 1515.68Poor 2011.76Below average 259.41Average 307.84Good 405.88Very good | 50 | 4.70 | Excellent |
Formula: L/100km = 235.215 ÷ MPG
Conversion Code Example
``javascript
function gallonsToLiters(gallons, isImperial = false) {
const factor = isImperial ? 4.54609 : 3.78541;
return gallons * factor;
}
function litersToGallons(liters, isImperial = false) {
const factor = isImperial ? 4.54609 : 3.78541;
return liters / factor;
}
function mpgToL100km(mpg) {
return 235.215 / mpg;
}
// Examples
console.log(gallonsToLiters(10)); // 37.8541
console.log(mpgToL100km(30)); // 7.84
``
Aquarium Sizes
| Gallons | Liters | Tank Type | 5 gal19 LBetta tank 10 gal38 LSmall community 20 gal76 LMedium tank 40 gal151 LLarge tank 75 gal284 LShow tank 125 gal473 LVery large
Cooking Measurements
US VolumeLiters 1 cup0.237 L 1 pint0.473 L 1 quart0.946 L | 1 gallon | 3.785 L |
Use this converter for accurate volume conversions between gallons and liters.