The gallon calculator is a converter that helps you convert gallons to cups, liters, cubic feet and inches, quarts, ounces, and even raindrops! Just input one of the values, and the rest will fill in automatically! It can convert both US and UK gallons. Our calculator can also convert gallons of water to pounds and kilograms.

You need to know how many gallons of water your aquarium or pool can hold? Check out these calculators:

What is a gallon?

A gallon is a unit of volume. It's bigger than a pint, liter, and fluid ounce, but smaller than cubic foot and a US barrel.

A comparison of 1 cup, 1 liter, and 1 gallon

Our calculator has four unit options correlated to gallons:

  • UK gallons
  • US gallons
  • US dry gallons
  • 1k US gallons

The UK gallon is bigger than the US gallon:

1 UK gallon = 1.201 US gallon, whereas 1 US gallon = 0.8317 UK gallon.

1 gallon is equal to 4 quarts, 8 pints, or 16 cups – so exactly the daily water intake for an average male adult.

In the next few paragraphs, you will find values of 1 gallon converted into different volume units.

Convert liters to gallons – metric units

1 US gallon

1 UK gallon

milliliter [ml]\footnotesize[\text{ml}]

3785

4546

centiliter [cl]\footnotesize[\text{cl}]

378.5

453.6

liter [l]\footnotesize[\text l]

3.785

4.546

hectoliter [hl]\footnotesize[\text{hl}]

0.03785

0.04546

cubic centimeters [cm3]\footnotesize [\text{cm}^3]

3785.4

4546

cubic decimeters [dm3]\footnotesize [\text{dm}^3]

3.7854

4.546

cubic meters [m3]\footnotesize [\text{m}^3]

3.7854103\footnotesize3.7854 \cdot 10^{-3}

4.546103\footnotesize4.546 \cdot 10^{-3}

cubic kilometers [km3]\footnotesize [\text{km}^3]

3.78541012\footnotesize3.7854 \cdot 10^{-12}

4.5461012\footnotesize4.546 \cdot 10^{-12}

Convert cubic feet to gallons & convert cubic inches to gallons

1 US gallon

1 UK gallon

cubic inches [cu in]\footnotesize[\text{cu in}]

231

277.4

cubic feet [cu ft]\footnotesize[\text{cu ft}]

0.13368

0.16054

cubic yards [cu yd]\footnotesize[\text{cu yd}]

4.951103\footnotesize4.951\cdot 10^{-3}

5.946103\footnotesize5.946\cdot 10^{-3}

cubic miles [cu mi]\footnotesize[\text{cu mi}]

9.081013\footnotesize9.08\cdot 10^{-13}

1.0911012\footnotesize 1.091 \cdot 10^{-12}

Convert quarts to gallons

1 US gallon

1 UK gallon

US quarts [US qt]\footnotesize[\text{US qt}]

4

4.804

UK quarts [UK qt]\footnotesize[\text{UK qt}]

3.331

4

US pints [US pt]\footnotesize[\text{US pt}]

8

9.608

UK pints [UK pt]\footnotesize[\text{UK pt}]

6.661

8

US barrels

0.031746

0.038125

Convert ounces to gallons

1 US gallon

1 UK gallon

US fluid ounces [US fl oz]\footnotesize[\text{US fl oz}]

128

153.72

UK fluid ounces [UK fl oz]\footnotesize[\text{UK fl oz}]

133.23

160

Convert gallons to cups

1 US gallon

1 UK gallon

US customary cups

16

19.215

tablespoons (15 ml) [tbsp]\footnotesize[\text{tbsp}]

252.36

303.1

teaspoons (5 ml) [tsp]\footnotesize[\text{tsp}]

757.1

909.2

Water – gallons to kilograms and pounds

A well-known property of water is that 1 liter weighs approximately 1 kilogram. This is due to its density – the ratio of mass to volume. The density of water changes with temperature. Our gallon calculator has a default value for the density of water at 20 °C (68 °F).

Below, you can see how much 1 US and UK gallons weigh at three different temperatures:

1 US gallon

1 UK gallon

4 °C / 39.2 °F

3.7856 kg / 8.346 lb

4.546 kg / 10.023 lb

21 °C / 69.8 °F

3.778 kg / 8.33 lb

4.538 kg / 10.004 lb

30 °C / 86 °F

3.769 kg / 8.31 lb

4.527 kg / 9.98 lb

As you see, the higher the temperature, the lighter water is. To learn more about water density, go to our water density calculator!

How to use the gallon calculator?

First, choose one of the two calculator's modes:

  1. Volume converter – input a value next to any unit, and all the other ones will fill in in a blink of an eye!
  2. Water – volume to weight: Input one of the two: volume or weight, and get the missing value. You can change water density according to your need.

Before you go, take a look at this universal conversion calculator that can convert temperature, length, area, volume, and weight! It can also explain SI unit prefixes!

FAQ

How to calculate gallons in a pool?

To calculate how many gallons your pool will hold, find its volume and convert it to gallons. For example, if your pool volume is in cubic inches, divide the volume by 231. If your pool volume is in cubic feet, multiply the volume by 7.48.

How to convert cubic inches to gallons?

To convert cubic inches to gallons (US), divide the number of cubic inches by 231:

number of US gallons = number of cubic inches / 231

To convert cubic inches to UK gallons, divide the number of cubic inches by 277.4:

number of UK gallons = number of cubic inches / 277.4

How to convert cubic feet to gallons?

To convert cubic feet to US gallons, multiply the number of cubic feet by 7.48:

number of US gallons = number of cubic inches × 7.48.

1 US gallon is equal to 0.13368 cubic feet, and 1 cubic foot is equal to 7.48 US gallons.

To convert cubic feet to UK gallons, multiply the number of cubic feet by 6.229:

number of UK gallons = number of cubic feet × 6.229.

1 UK gallon is equal to 0.16054 cubic feet, and 1 cubic foot is equal to 6.229 UK gallons.

How to convert quarts to gallons?

1 gallon is equal to 4 quarts. To convert quarts to gallons, divide the number of quarts by 4:

number of gallons = number of quarts / 4

How to convert gallons into cups?

To convert gallons to cups, multiply the number of gallons by 16:

number of cups = number of gallons × 16

1 gallon is equal to 4 quarts, 8 pints, 16 cups, or 128 fluid ounces.

Julia Żuławińska
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