Gallons to Liters Converter — Free Gal to L Tool
Our free gallons to liters converter instantly converts US gallons to liters. Use the gallons to liters formula: multiply gallons by 3.78541. This gallons to liters tool uses the exact US liquid gallon definition. See Wikipedia on the gallon and the NIST unit conversion guide.
🧪 Gallons to Liters Converter
How to Convert Gallons to Liters
Multiply by 3.78541 — the exact US liquid gallon to litre factor.
Gallons to Liters Conversion Table
Common gallon values converted to liters at a glance.
| Gallon (US) (gal) | Liter (L) |
|---|---|
| 0.5 gal | 1.892706 L |
| 1 gal | 3.785412 L |
| 2 gal | 7.570824 L |
| 3 gal | 11.356235 L |
| 5 gal | 18.927059 L |
| 10 gal | 37.854118 L |
| 15 gal | 56.781177 L |
| 20 gal | 75.708236 L |
| 25 gal | 94.635295 L |
| 50 gal | 189.270589 L |
Real-Life Gallons to Liters Examples
Everyday situations where gallons need to be in litres.
⛽ Fuel Economy Abroad
US cars are rated in miles per gallon (MPG); international fuel economy uses litres per 100 km. A car that holds 15 gallons = 56.78 litres. Converting tank capacity to litres is the first step in comparing fuel efficiency across systems.
When driving a US-spec vehicle in a metric country, or comparing a European fuel consumption figure against an American MPG rating, knowing the gallon-to-litre conversion puts both figures on the same footing.
🥛 US Recipe & Food Quantities
American recipes sometimes call for quantities in gallons — particularly for large batches, brines, or homebrewing. A 1-gallon brine = 3.785 L. A 5-gallon homebrew batch = 18.93 L. Metric kitchen equipment needs litres.
When scaling a US recipe up to commercial quantities, or brewing beer using a metric fermenter, converting the gallon quantities into litres ensures you fill containers to the correct level and maintain the right concentration.
🏡 Water Heaters & Appliances
US water heaters, storage tanks, and dishwashers are rated in gallons; equivalent international products are rated in litres. A 50-gallon water heater = 189.27 L. A 0.5-gallon dishwasher cycle = 1.89 L.
When importing a US appliance or comparing its capacity against a European equivalent, converting gallons to litres lets you confirm the product will meet your household hot water demand or fits the available space.
🌊 Aquariums & Fish Tanks
US fish-keeping guides specify tank sizes and chemical doses in gallons; international equivalents use litres. A 10-gallon starter tank = 37.85 L. A 55-gallon display tank = 208.2 L. Dosing instructions from US brands use gallons.
When treating a metric aquarium with a US-brand medication that specifies dose per gallon, convert your tank's litre capacity to gallons first. This prevents over-dosing, which can harm fish, or under-dosing, which won't treat the disease.
Frequently Asked Questions
Frequently Asked Questions
1 Gallon (US) (gal) equals 3.785412 Liters (L).
Multiply the value in Gallon (US)s by 3.785412. For example, 10 Gallon (US)s = 37.854118 Liters.
Yes. ConvertNow uses precise factors for all unit calculations. Currency conversions use live exchange rates updated regularly.
Yes — type into the right-hand field to reverse the conversion.