Volume converter

Liters, gallons, cups and milliliters, with US and UK measures kept apart and labelled.

Volume converter

Value

Precision

From

1 US gallon equals

3.785411784 L

This is the exact value.

How it is worked out

1 gal = 3.785411784 L (exact).
1 gal × 3.785411784 = 3.785411784 L.

US gallon: Exactly 231 cubic inches.

1 US gallon in other units

milliliter: 3,785.411784 mL
liter: 3.785411784 L
US teaspoon: 768 tsp
US tablespoon: 256 tbsp
US fluid ounce: 128 fl oz
US cup: 16 cup
US pint: 8 pt
US quart: 4 qt
cubic meter: 0.003785411784 m³

US gallon to liter chart

Conversion chart from US gallons to liters
US gallon (gal)	liter (L)
1	3.785411784
2	7.570823568
5	18.92705892
10	37.85411784
25	94.6352946
50	189.2705892
100	378.5411784
1,000	3,785.411784

US and UK units share names but not sizes: a US gallon is 3.785 L and a UK gallon is 4.546 L, and a US pint is 16 fl oz while a UK pint is 20 fl oz.

US and UK measures, side by side

The same amount in US and UK gallons, quarts and pints.

Amount

Unit

1 liter equals

0.264172 US gal

0.219969 UK (imperial) gallons. Rounded to 6 significant digits.

How it is worked out

US gallons: 1 L × 0.2641720524 ≈ 0.264172 gal. A US gallon is exactly 3.785411784 L.
UK gallons: 1 L × 0.2199692483 ≈ 0.219969 gal (UK). A UK gallon is exactly 4.54609 L.
A UK gallon holds about 20% more than a US gallon, so the same amount is a smaller number of UK gallons.

The same amount in each measure

US and UK gallons, quarts, pints and fluid ounces for the amount entered
Measure	US	UK (imperial)
Gallons	0.264172	0.219969
Quarts	1.05669	0.879877
Pints	2.11338	1.75975
Fluid ounces	33.814	35.1951

A US pint is 16 fluid ounces and a UK pint is 20, and a UK fluid ounce is slightly smaller than a US one.

At a glance

What it does: Converts between 20 units of volume: metric (milliliter, liter, cubic centimeter and meter, metric cup), US customary (teaspoon to gallon, oil barrel), UK imperial (fluid ounce to gallon) and cubic inches, feet and yards.
US and UK kept apart: Units that come in both a US and a UK size are named for each: US and UK fluid ounce, pint, quart and gallon. The US teaspoon, tablespoon and cup are labelled US as well. The US gallon is 3.785411784 L and the UK gallon is 4.54609 L, so the gallon you get by default is the US gallon.
Exactness: Uses exact fractions. A US gallon is exactly 231 cubic inches and a UK gallon exactly 4.54609 liters. The answer is rounded once, at the end.
Side by side: A card below the converter shows any amount in US and UK gallons, quarts, pints and fluid ounces at once.
Precision: Automatic, 0 to 10 decimal places, or 3 to 12 significant digits. Cooking rarely needs more than one decimal of a milliliter or ounce.
Privacy: Nothing is sent when you type. Your numbers are kept in the page address so Copy link works, so a shared link carries them.
Price: Free, no sign-up.

How to do it

1
Enter the volume
Type or paste a volume, such as 1,250.5 or 3,5. A comma that groups digits in threes is a thousands separator, so 1,234 means one thousand two hundred thirty-four, and any other single comma is a decimal comma, so 3,5 means 3.5. The "Read as" line under the box shows how your text was read.
2
Choose the units
Pick From and To. The menus are grouped into metric, US customary, UK imperial and cubic. Look for the label: "US gallon" and "UK gallon" are different sizes.
3
Read the answer and the working
The result updates as you type. Under it you will see the exact relationship, such as 1 gal = 3.785411784 L, and the multiplication.
4
Compare US and UK
The US and UK measures, side by side card shows the same amount in both systems, so you can see how far apart they are.

US and UK units share names but not sizes

The US gallon is defined as exactly 231 cubic inches, which is 3.785411784 L. The UK (imperial) gallon, defined by law in 1985, is exactly 4.54609 L, about 1.201 times bigger. The smaller units follow, but not in the same way:

Pint: a US pint is 16 fluid ounces, 473.176 mL. A UK pint is 20 fluid ounces, 568.261 mL, which is the pint a pub pours.
Fluid ounce: a US fluid ounce is 29.5735 mL and a UK one is 28.4131 mL. The UK ounce is slightly smaller, but there are more of them in a pint.
Quart: both systems have 4 quarts to the gallon, but a UK quart is 1.1365225 L and a US quart is 0.946352946 L.
Cup: the US cup is 8 US fluid ounces, 236.5882 mL. The metric cup used in Australia, New Zealand and Canada is 250 mL.

In this converter the fluid ounce, pint, quart and gallon each have a US and a UK version, and the US cup, teaspoon and tablespoon carry US in their names, so the name always tells you which one you picked.

Cooking measures

Teaspoon: 4.9289 mL (US). Recipes often treat it as 5 mL.
Tablespoon: 14.7868 mL (US), which is three teaspoons. Recipes often treat it as 15 mL. In Australia a tablespoon is 20 mL, so check where a recipe comes from.
US cup: 236.5882 mL, and 250 mL for the metric cup. They differ by about 6 percent, which rarely matters in a soup and can in a cake.
Liter in cups: 4.227 US cups.

Cups and spoons measure volume, not weight, so the weight of a cup depends on what is in it. For flour, sugar and butter, a kitchen scale and the weight converter are more reliable.

Cubic units and the oil barrel

A liter is exactly 1,000 cubic centimeters, and 1 mL is exactly 1 cm³. A cubic meter is exactly 1,000 liters.
A cubic foot is 28.316846592 L, or about 7.48 US gallons.
A cubic inch is exactly 16.387064 mL, the unit behind the US gallon: 231 of them make a gallon.
An oil barrel is 42 US gallons, 158.987294928 L. It is a unit of trade for crude oil, not the size of any particular container.

For everyday liquid, the commonest conversion by far is liters to gallons.

Questions people ask

How many liters are in a US gallon?

Exactly 3.785411784. A US gallon is defined as 231 cubic inches. A UK gallon is 4.54609 liters.

How many cups are in a gallon?

16 US cups, because a gallon is 4 quarts, a quart is 2 pints and a pint is 2 cups. A UK gallon is 4 quarts, 8 UK pints or 160 UK fluid ounces.

How many milliliters are in a US cup?

236.5882 mL. Many recipes and the metric cup use 250 mL, and US nutrition labels use 240 mL.

Is a UK pint bigger than a US pint?

Yes. A UK pint is 568.261 mL and a US pint is 473.176 mL, about 1.2 times as much.

Does it convert liquid or dry volume?

Liquid. There is also a US dry gallon, about 4.4 liters, used for dry goods such as grain, which this converter does not include.

Is anything I type stored or sent?

No. Typing sends nothing anywhere: the conversion runs in your browser. Your numbers are also kept in the page address so that Copy link works. That means a link you share, or a page you reload, requests that address, numbers included, from our server like any web address. Share a link only if you are happy to share the numbers.

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