How many liters are in a gallons?

There are 3.78541 liters in one gallons.

How do I convert gal to L?

To convert gallons to liters, multiply the gallons value by 3.78541.

Gallons is a common unit used in measurements and conversions. Convertaro provides instant conversion to liters and more.

Volume Converter

US gallons to liters Converter

gallons to liters converter

Convert US gallons to liters with the precise 1 gal = 3.785411784 L factor. Key for fuel calculations, container sizing, home brewing, and any US-to-metric volume conversion where the gallon is the starting point.

Used most often when a US recipe or fuel cost comparison lists gallons but a European audience needs liters, when swimming pool capacity is listed in gallons and a metric chemical dosage guide uses liters, or when comparing US and international bottled water container sizes.

Also useful: convert liters to gallons, Liters To Gallons, Gallons To Milliliters.

Gallons To Liters Converter

From US gallons

US gallons

To liters

3.785412

liters

Calculation: L = gal x 3.785411784

Conversion Formula

L = gal x 3.785411784

Take the value in gallons, multiply it by 3.785412, and the result is the same amount in liters.

This page uses US gallons. If your source uses Imperial gallons, confirm the standard before comparing totals.

Reverse

gal = L x 0.2641720524

To go the other way, use the reverse formula so the unit relationship stays exact.

How to Convert

1Start with the gallons valueEnter the amount you already have in gal. Double-check the source unit first so you are converting the right number.
2Apply the gallons to liters formulaUse L = gal x 3.785411784 or let the converter calculate it instantly. This gives you the equivalent value in L.
3Round for your use caseUse more decimals for science, billing, or engineering. For everyday use, round only after the full conversion is done.

All Volume tools

US gallons → liters Table

Common reference values

Quick reference values for common US gallons to liters conversions.
US gallons	liters
US gallons1	liters3.785412 liters
US gallons2	liters7.570824 liters
US gallons5	liters18.927059 liters
US gallons10	liters37.854118 liters
US gallons20	liters75.708236 liters
US gallons50	liters189.270589 liters
US gallons100	liters378.541178 liters

Popular gal values

Open exact-value pages for common lookups on this converter.

1 gal → L 2 gal → L 3 gal → L 4 gal → L 5 gal → L 6 gal → L 7 gal → L 8 gal → L 9 gal → L 10 gal → L 11 gal → L 12 gal → L 13 gal → L 14 gal → L 15 gal → L 16 gal → L 17 gal → L 18 gal → L 19 gal → L 20 gal → L 21 gal → L 22 gal → L 23 gal → L 24 gal → L 25 gal → L 26 gal → L 27 gal → L 28 gal → L 29 gal → L 30 gal → L 31 gal → L 32 gal → L 33 gal → L 34 gal → L 35 gal → L 36 gal → L 37 gal → L 38 gal → L 39 gal → L 40 gal → L 41 gal → L 42 gal → L 43 gal → L 44 gal → L 45 gal → L 46 gal → L 47 gal → L 48 gal → L 49 gal → L 50 gal → L 51 gal → L 52 gal → L 53 gal → L 54 gal → L 55 gal → L 56 gal → L 57 gal → L 58 gal → L 59 gal → L 60 gal → L 61 gal → L 62 gal → L 63 gal → L 64 gal → L 65 gal → L 66 gal → L 67 gal → L 68 gal → L 69 gal → L 70 gal → L 71 gal → L 72 gal → L 73 gal → L 74 gal → L 75 gal → L 76 gal → L 77 gal → L 78 gal → L 79 gal → L 80 gal → L 81 gal → L 82 gal → L 83 gal → L 84 gal → L 85 gal → L 86 gal → L 87 gal → L 88 gal → L 89 gal → L 90 gal → L 91 gal → L 92 gal → L 93 gal → L 94 gal → L 95 gal → L 96 gal → L 97 gal → L 98 gal → L 99 gal → L 100 gal → L

Frequently Asked Questions

QHow many liters is 5 gallons?

5 US gallons equals approximately 18.93 liters. Multiply 5 × 3.78541 = 18.93 liters. Standard 5-gallon water jugs and office water coolers contain about 18.9 liters.

QHow many liters is a gallon of milk?

1 US gallon of milk equals 3.785 liters. US supermarkets sell milk in 1-gallon jugs which is the equivalent of roughly 3.78 liters — slightly less than a 4-liter carton common in Canada.

QHow many liters per 100 km is 30 mpg?

30 mpg (US) is approximately 7.84 liters per 100 km. The formula: 235.21 / mpg = L/100km. So 235.21 / 30 = 7.84 L/100km. This is a common efficiency target for mid-size cars.

QHow do I convert liters back into gallons?

For the reverse direction, use the Liters To Gallons Converter page.

Understanding the units

What is gal?

Gallons are common for fuel, liquids, and tank capacities in imperial systems.

What is L?

Liters are standard metric volume units used for liquids, fuel, and capacity labels.

Where this conversion shows up

Gallons To Liters Converter often comes up in cooking recipes and kitchen measurements, fuel tank and container capacity comparisons, and aquarium, pool, and liquid storage planning. It is most useful when the source value is published in one unit but the person reading it expects another.

If you are comparing nearby units, browse the full volume converters collection for the closest match instead of doing extra manual steps.

A common next step is to compare this result with Liters To Gallons or switch direction with Liters To Gallons.

Real-world examples

Cooking, baking, and recipe scaling

1 gal -> 3.785411784 L

Useful when a recipe mixes cups, fluid ounces, milliliters, and liters from different regional measurement traditions.

Fuel, tanks, and storage capacity

2 gal -> 7.570823568 L

Helpful for comparing tank sizes, container volumes, and fuel quantities expressed in liters versus gallons.

Lab measurements and pharmacy

5 gal -> 18.92705892 L

Important when dosage instructions, chemical preparations, or medical quantities switch between metric and US volume units.

Quick reference and common mistakes

Use the quick table for fast lookups and the formula when accuracy matters. Keep more decimals during intermediate steps, then round only for the final number you plan to show or report.

Rounding too early and carrying an inaccurate value to the next step.
Mixing gallons and liters values in the same equation without converting first.
Copying values from references that use different unit standards.

Why this conversion matters

Converting gallons to liters accurately prevents communication errors between teams, tools, and regions that use different standards. If you need the opposite direction, use the Liters To Gallons Converter.

If you are staying in the same workflow, continue with Liters To Gallons, Gallons To Milliliters, Liters To Milliliters.