Gallon to Liter Calculator — Convert Gal to L Instantly
Turn gallons into liters in seconds with our free US converter. Built for fuel tanks, pool care, brewing kettles, and 55-gallon drums — exact 3.78541 math, no signup.
US Volume Converter - Gallons, Quarts, Cups, Liters & mLThe 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 is the US liquid gallon you see at every American gas pump, from Los Angeles to New York, and on every US product label. 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. Gas pumps, milk jugs, paint cans, and pool chemical labels from Seattle to Miami 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 — picture a cube 10 cm on every side. Nearly every country outside the US prices fuel, bottles drinks, and labels engine fluids in liters — including Canada, where the pumps read liters per the gallon. 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 Canada, 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
American workshop manuals specify lubricant deliveries per 55-gallon drum, but your supplier — especially for imported fluids — invoices by the liter. Converting 55 US gal to 208.20 L keeps reorder quantities, shop inventories, and waste-disposal paperwork aligned on both systems.
Treating a backyard pool
US pool volume calculators report gallons, while imported chlorine and algaecide dose per liter. A 12,000 US gal pool in Arizona or Florida is 45,424.92 L — running that figure through the converter before chemical day prevents a costly 20%-style dosing error on a hot summer weekend.
Fueling a boat, RV, or truck across the border
Drive into Canada or Mexico and the pumps switch to liters: your pickup's 26-gallon tank reads 98.42 L at the pump. Converting tank capacity before the trip tells you exactly what a fill-up costs and whether the jerry cans in the bed match the local pricing unit.
Mixing agricultural sprayer batches
A 40 US gal sprayer tank on a Midwest farm 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
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1
Enter Your Volume in Gallons
Type the US gallon value — for example, enter 5 for a gas can on a camping trip, 36 for a full-size F-150 fuel tank, or 55 for a standard oil drum
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2
See the Liter Equivalent
The result appears instantly: 5 US gal = 18.93 L — perfect when an imported product, spec sheet, or Canadian pump lists everything in liters
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3
Copy or Reverse
Copy the result or click Swap to convert liters back to US gallons — ideal when a metric label needs translating into American units
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4
Check the Table
Browse the conversion table for common values like 13 gal = 49.21 L (a mid-size sedan's tank) or 30 gal = 113.56 L (a typical water heater)
Why Use Be Converter?
Instant Conversion
Get precise results in real-time as you type — from a 1 gal jug of milk (3.79 L) to a 350 gal backyard hot tub (1,324.89 L), no page reloads
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 spec sheets never trip you up
Handy Reference Table
Everyday values at a glance — 5 gal = 18.93 L (Home Depot bucket), 20 gal = 75.71 L (aquarium), 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, the same tote your farm supply store stocks
Free & Unlimited
No registration, no paywall. Convert fuel tanks, drums, and jugs of any size as often as you need — always free, always fast
Completely Private
All calculations run locally in your browser. Your fuel, pool, 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 gallons-to-liters converter delivers instant, accurate conversions from the American gallon to the metric liter. Whether you're filling a pickup in Texas, balancing pool chemistry in Florida, stocking up on brewing supplies, or ordering bulk fluids invoiced by the liter, this tool gives you dependable numbers in real time. The US liquid gallon — defined as exactly 3.78541 liters — remains the standard for gasoline, milk, and paint from coast to coast, while the liter rules everywhere else, including right across the Canadian border. Our converter applies the exact US definition and clearly separates it from the larger UK imperial gallon (4.54609 liters) so your math stays correct on every spec sheet, import form, and dosing label.
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 at the pump, treat a gallon as 3.8 liters. Ten gallons becomes 38 L versus the exact 37.85 L — off by only 0.4%, plenty close for gas station and grocery math.
Watch British sources: an imperial gallon (4.54609 L) is about 1.2 US gallons. UK fuel economy figures in "mpg (imp)" must be converted with the larger gallon or your numbers will look 20% too good compared to the EPA sticker on the window.
Bulk logistics run on drums: one 55 US gal drum is 208.20 L, so a pallet of four drums carries 832.8 L — the figure freight quotes out of Houston or Long Beach expect.
US pool calculators output gallons; imported pool chemicals dose per liter. A 12,000 gal backyard pool in Phoenix is 45,424.92 L — dosing by gallons against a per-liter label would overshoot badly on a 100°F summer day.