Gallon Calculator | Gallon Converter (2024)

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Table of contents

What is a gallon?Convert liters to gallons – metric unitsConvert quarts to gallonsConvert ounces to gallonsConvert gallons to cupsWater – gallons to kilograms and poundsHow to use the gallon calculator?FAQs

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:

  • Aquarium calculator
  • Pool calculator

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.

Gallon Calculator | Gallon Converter (1)

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}][ml]

3785

4546

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

378.5

453.6

liter [l]\footnotesize[\text l][l]

3.785

4.546

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

0.03785

0.04546

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

3785.4

4546

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

3.7854

4.546

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

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

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

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

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

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

Convert cubic feet to gallons & convert cubic inches to gallons

1 US gallon

1 UK gallon

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

231

277.4

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

0.13368

0.16054

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

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

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

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

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

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

Convert quarts to gallons

1 US gallon

1 UK gallon

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

4

4.804

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

3.331

4

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

8

9.608

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

6.661

8

US barrels

0.031746

0.038125

Convert ounces to gallons

1 US gallon

1 UK gallon

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

128

153.72

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

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}][tbsp]

252.36

303.1

teaspoons (5 ml) [tsp]\footnotesize[\text{tsp}][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 the blink of an eye!
  2. Water gallons to weight converter: Input one of the two: volume or weight, and get the missing value. You can change water density according to your needs.

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!

FAQs

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.

Gallon Calculator | Gallon Converter (2024)

FAQs

How can I calculate gallons? ›

Formula:
  1. Formula:
  2. L x W x D. = Cubic Feet.
  3. Cubic ft x 7.47. = Gallons.

How do you convert measurements 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.

Is 64 oz the same as 1 gallon? ›

Is 64 oz the same as 1 gallon? 64 oz is equal to 1/2 gallon. In the US Customary System, 1 gallon equals 128 ounces. Since 64 oz is half of 128 oz, 64 ounces is equal to half (1/2) a gallon (0.5 gallons).

How many gallons are in 1 gallon? ›

A gallon is a unit used to measure volume. The gallon is a US customary unit of volume. Gallons can be abbreviated as gal; for example, 1 gallon can be written as 1 gal.

How do you calculate gas per gallon? ›

The easiest way to calculate your gas mileage is to simply divide the number of miles traveled by the number of gallons of gas your vehicle took to refill. In sum, that's miles driven divided by gallons of gas used.

How much is 1 gallons? ›

The US liquid gallon (frequently called simply "gallon") is legally defined as 231 cubic inches, which is exactly 3.785411784 litres. A US liquid gallon can contain about 3.785 kilograms or 8.34 pounds of water at 3.98 °C (39.16 °F), and is about 16.7% less than the imperial gallon.

How is a gallon measured? ›

Definitions and Divisions

The U.S. liquid gallon, as mentioned earlier, is equal to 128 fluid ounces, or 3.78541 liters. The Imperial gallon, used in the U.K. and other countries that employ the Imperial system of measurement, is equal to 160 fluid ounces, or 4.54609 liters.

What are the measurements up to a gallon? ›

Dry goods and liquids up to 1 gallon
MeasureEquivalent
4 gills1 pint
2 pints1 quart
4 quarts1 gallon

How do you calculate volume? ›

To find the volume, you multiply length times width times height, which is 3x1x2, which equals six. So the volume of the fish tank is 6 cubic feet.

How to figure ounces per gallon? ›

In the US there are 128 ounces to a gallon. In the UK, there are 160 ounces to a gallon. To convert, use the formula for whichever rate you are using: x ounces / 128 = y gallons.

How many ounces is 1 gallon? ›

How many ounces in 1 gallon? There are 128 fluid ounces in 1 gallon.

How many cups to 1 gallon? ›

In liquid measurement, there are 16 cups in a gallon.

How do you calculate 1 gallon? ›

There are 128 U.S. fluid ounces in one U.S. liquid gallon. So, if you know the volume of a liquid or a container in fluid ounces, simply divide the amount by 128 to convert to gallons.

What does 1 gallon measure equal? ›

A gallon is a unit of volume measurement for liquids. One gallon also equals 128 fluid ounces, 4 quarts or 8 pints. A simple way to visualize this measurement is to think of a gallon of milk or water, just divided into 16 cups.

What makes 1 gallon? ›

A gallon is a common unit of liquid measure equal to 3.79 liters in U.S. measurement, which converts to 128 ounces. In Imperial measurement, a gallon is equal to 4.54 liters, which converts to 153 ounces.

How do I calculate cost per gallon? ›

To calculate the cost per gallon of any liquid, divide the total cost by the volume in gallons.

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