US Gallons to Liters Converter
Convert US gallons to liters instantly with our free online tool. Ideal for engine oil drums, pool volumes, and RV tanks. Accurate gal to L results.
Volume ConverterThe quick answer for 1 US Gallons — type any value below for the exact result
US Gallons
Liters
gal to L Conversion Formula
To convert US gallons to liters, multiply the gallon value by 3.78541. This converts US liquid gallons, the unit used at American gas pumps and on US product labels. The UK (imperial) gallon is larger at 4.54609 liters.
US Gallons and Liters Explained
US Gallons (gal_us)
The US liquid gallon is the volume standard of the United States, defined as exactly 3.78541 liters — the old English wine gallon of 231 cubic inches. It splits into 4 quarts, 8 pints, or 128 fluid ounces, and a full gallon of water weighs about 8.34 pounds. Fuel pumps, milk packaging, paint cans, and pool chemical labels across America all count in these gallons.
Where it is used: Dominant in the United States and still common in Liberia, Belize, and several Caribbean countries for fuel and everyday liquids.
Origin: English statute fixed the wine gallon at 231 cubic inches in 1707; the newly independent US kept it in 1776-era custom while Britain redefined its gallon in 1824.
Liters (l)
The liter (L) is the metric unit of volume, equal to one cubic decimeter — imagine a cube 10 cm on every side. Nearly every country outside the US prices fuel, bottles drinks, and labels engine fluids in liters. It takes about 3.78541 liters to fill one US gallon, and a liter of water weighs almost exactly one kilogram, which is how the unit was first conceived.
Where it is used: The default liquid measure for fuel, beverages, cooking, science, and industry across Europe, Asia, Africa, Oceania, and Latin America.
Origin: Born with the French metric system in the 1790s as the volume of one kilogram of water; redefined in 1964 as exactly 1,000 cubic centimeters.
US Gallons to Liters Conversion Table
| US Gallons (gal_us) | Liters (l) |
|---|---|
| 0.5 gal_us | 1.892705 l |
| 1 gal_us | 3.78541 l |
| 2 gal_us | 7.57082 l |
| 3 gal_us | 11.35623 l |
| 5 gal_us | 18.92705 l |
| 10 gal_us | 37.8541 l |
| 13 gal_us | 49.21033 l |
| 20 gal_us | 75.7082 l |
| 26 gal_us | 98.42066 l |
| 30 gal_us | 113.5623 l |
| 40 gal_us | 151.4164 l |
| 55 gal_us | 208.19755 l |
| 100 gal_us | 378.541 l |
| 200 gal_us | 757.082 l |
| 500 gal_us | 1892.705 l |
Liters to US Gallons Conversion Table
| Liters (l) | US Gallons (gal_us) |
|---|---|
| 1 l | 0.2641721769 gal_us |
| 2 l | 0.5283443537 gal_us |
| 5 l | 1.3208608843 gal_us |
| 10 l | 2.6417217686 gal_us |
| 20 l | 5.2834435372 gal_us |
| 50 l | 13.2086088429 gal_us |
| 100 l | 26.4172176858 gal_us |
| 208.2 l | 55.0006472218 gal_us |
| 500 l | 132.086088429 gal_us |
| 1000 l | 264.172176858 gal_us |
US Gallons to Liters in Everyday Objects
Common real-world examples that make US Gallons and Liters easy to picture at a glance.
| US Gallons (gal_us) | Liters (l) | |
|---|---|---|
| Gallon jug of milk | 1 gal_us | 3.78541 l |
| Five-gallon bucket | 5 gal_us | 18.92705 l |
| Kitchen trash can | 13 gal_us | 49.21033 l |
| Fifty-five-gallon drum | 55 gal_us | 208.19755 l |
| Backyard hot tub | 350 gal_us | 1324.8935 l |
| Pickup truck fuel tank | 26 gal_us | 98.42066 l |
When You Need US Gallons to Liters Conversions
Servicing machinery from oil drums
Workshop manuals written in the US specify lubricant deliveries per 55-gallon drum, but your supplier invoices by the liter. Converting 55 US gal to 208.20 L keeps reorder quantities, fluid inventories, and waste-disposal paperwork aligned on both systems.
Treating an American-spec pool
US pool volume calculators report gallons, while chlorine and algaecide bought in Europe dose per liter. A 12,000 US gal pool is 45,424.92 L — running that figure through the converter before chemical day prevents a costly 20%-style dosing error on a hot weekend.
Fueling a boat or RV abroad
Your pickup's 26-gallon tank reads 98.42 L at a marina or European station that sells diesel by the liter. Converting tank capacity first tells you exactly how many liters a fill-up takes and whether the jerry cans in the back match the pump's pricing unit.
Mixing agricultural sprayer batches
A 40 US gal sprayer tank equals 151.42 L, and herbicide labels list rates per acre or per 100 L. Converting the tank to liters before mixing keeps concentrate ratios correct when the product sheet is metric but the equipment dial is in gallons.
Related Volume Conversions
How to Use
-
1
Enter Your Volume in Gallons
Type the US gallon value — for example, enter 5 for a gas can, 26 for a pickup fuel tank, or 55 for an oil drum
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2
See the Liter Equivalent
The result appears instantly: 5 US gal = 18.93 L, so you can order fluids in metric packaging without guesswork
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3
Copy or Reverse
Copy the result or click Swap to convert liters back to US gallons
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4
Check the Table
Browse the conversion table for common values like 13 gal = 49.21 L or 30 gal = 113.56 L
Why Use Be Converter?
Instant Conversion
Get precise US gallon to liter results in real-time as you type — from a 1 gal milk jug (3.79 L) to a 350 gal hot tub (1,324.89 L)
Exact US Definition
Uses the exact US liquid gallon of 3.78541 liters (231 cubic inches) — and flags the larger UK gallon (4.54609 L) so imported specs never trip you up
Handy Reference Table
Common values at a glance — 5 gal = 18.93 L, 20 gal = 75.71 L, and the classic 55 gal drum = 208.20 L
Swap with One Click
Flip the pair instantly to turn metric quantities back into gallons — a 1,000 L IBC tote becomes 264.17 US gal
Free & Unlimited
No registration required. Convert drums, tanks, and jugs of any size as often as you need — always free
Completely Private
All calculations run locally in your browser. Your fuel and fluid volumes never leave your device
Frequently Asked Questions
How many liters are in 1 US gallon?
How do I convert gallons to liters?
What is 5 gallons in liters?
Is a US gallon the same as a UK gallon?
Is a gallon bigger than a liter?
How many liters is a 55-gallon drum?
How many liters is a 20-gallon aquarium?
How many liters is a 30-gallon water heater?
About US Gallons to Liters Converter
Our free online US gallons to liters converter provides instant, accurate volume conversions from the American gallon to the metric liter. Whether you are servicing equipment rated in gallons, ordering bulk fluids sold by the liter, planning pool chemistry, or comparing appliance capacities between US and metric markets, this tool delivers reliable results. The US liquid gallon, defined as exactly 3.78541 liters, remains the standard for fuel, milk, and paint across the United States, while the liter serves the rest of the world. Our converter applies the exact US definition and clearly separates it from the larger UK imperial gallon (4.54609 liters) so your conversions stay correct on every spec sheet.
Expert Tips for gal to L Conversion
The exact conversion is 1 US gal = 3.78541 L, because the US gallon is defined as 231 cubic inches and one inch is exactly 25.4 mm.
For mental math, treat a gallon as 3.8 liters. Ten gallons becomes 38 L versus the exact 37.85 L — off by only 0.4%, fine for shopping lists.
Watch UK sources: an imperial gallon (4.54609 L) is about 1.2 US gallons. British fuel economy in "mpg (imp)" must be converted with the larger gallon or your numbers will be 20% optimistic.
Bulk logistics run on drums: one 55 US gal drum is 208.20 L, so a pallet of four drums carries 832.8 L — a figure metric freight quotes expect.
US pool calculators output gallons; European pool chemicals dose per liter. A 12,000 gal pool is 45,424.92 L, and using gallons against a per-liter dose would overshoot badly.