Gallon Calculator | Gallon Converter (2024)

Last updated:Jul 23, 2024

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 $\footnotesize[\text{ml}]$ [ml]	3785	4546
centiliter $\footnotesize[\text{cl}]$ [cl]	378.5	453.6
liter $\footnotesize[\text l]$ [l]	3.785	4.546
hectoliter $\footnotesize[\text{hl}]$ [hl]	0.03785	0.04546
cubic centimeters $\footnotesize [\text{cm}^3]$ [cm3]	3785.4	4546
cubic decimeters $\footnotesize [\text{dm}^3]$ [dm3]	3.7854	4.546
cubic meters $\footnotesize [\text{m}^3]$ [m3]	$\footnotesize3.7854 \cdot 10^{-3}$ 3.7854⋅10−3	$\footnotesize4.546 \cdot 10^{-3}$ 4.546⋅10−3
cubic kilometers $\footnotesize [\text{km}^3]$ [km3]	$\footnotesize3.7854 \cdot 10^{-12}$ 3.7854⋅10−12	$\footnotesize4.546 \cdot 10^{-12}$ 4.546⋅10−12

Convert cubic feet to gallons & convert cubic inches to gallons

	1 US gallon	1 UK gallon
cubic inches $\footnotesize[\text{cu in}]$ [cuin]	231	277.4
cubic feet $\footnotesize[\text{cu ft}]$ [cuft]	0.13368	0.16054
cubic yards $\footnotesize[\text{cu yd}]$ [cuyd]	$\footnotesize4.951\cdot 10^{-3}$ 4.951⋅10−3	$\footnotesize5.946\cdot 10^{-3}$ 5.946⋅10−3
cubic miles $\footnotesize[\text{cu mi}]$ [cumi]	$\footnotesize9.08\cdot 10^{-13}$ 9.08⋅10−13	$\footnotesize 1.091 \cdot 10^{-12}$ 1.091⋅10−12

Convert quarts to gallons

	1 US gallon	1 UK gallon
US quarts $\footnotesize[\text{US qt}]$ [USqt]	4	4.804
UK quarts $\footnotesize[\text{UK qt}]$ [UKqt]	3.331	4
US pints $\footnotesize[\text{US pt}]$ [USpt]	8	9.608
UK pints $\footnotesize[\text{UK pt}]$ [UKpt]	6.661	8
US barrels	0.031746	0.038125

Convert ounces to gallons

	1 US gallon	1 UK gallon
US fluid ounces $\footnotesize[\text{US fl oz}]$ [USfloz]	128	153.72
UK fluid ounces $\footnotesize[\text{UK fl oz}]$ [UKfloz]	133.23	160

Convert gallons to cups

	1 US gallon	1 UK gallon
US customary cups	16	19.215
tablespoons (15 ml) $\footnotesize[\text{tbsp}]$ [tbsp]	252.36	303.1
teaspoons (5 ml) $\footnotesize[\text{tsp}]$ [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:

Volume converter – input a value next to any unit, and all the other ones will fill in in the blink of an eye!
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 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. Example: The volume of a tank is 931 U.S. fluid ounces. Calculate the volume of the same tank in gallons.

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What is the weight converter for a gallon? ›

What is the conversion for 1 gallon to pounds? If you are dealing with water and need to convert 1 gallon to pounds, a gallon of pure water at 39.2 °F (4.0 °C) weighs 8.3452 lb. Conversely, if you want to convert 1 pound to gallons, a pound of water is equivalent to that of 0.11983 gallons.

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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.

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How to calculate how many gallons a container holds? ›

Formula:

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

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How to calculate gallons of water? ›

The capacity in gallons is equal to the volume in cubic feet multiplied by 7.48 gallons per cubic foot.

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How many answers is a gallon? ›

The most important thing to remember about changing ounces to gallons is that there are 128 fluid ounces in every gallon. Another way to think of it is for every gallon, you have 128 ounces.

How to convert gal to lb? ›

Measure the Volume in Gallons: Determine how many gallons you have that you want to convert to pounds. 3. Multiply the Volume by the Density: Multiply the number of gallons by the density (in pounds per gallon) to get the weight in pounds.

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How many lbs is I gallon of water? ›

Solution: One gallon of water weighs approximately 8.34 pounds, which is equivalent to 3.785 kg.

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How to measure 1 gallon? ›

For example, 1 gallon = 128 fluid ounces, 1 gallon = 4 quarts, 1 gallon = 8 pints, and 1 gallon = 16 cups. Use Appropriate Containers: When measuring or transferring liquids in gallons, use containers designed to hold that volume to avoid spillage and ensure accuracy.

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How do you calculate gallons used? ›

Record the trip starting odometer reading at the time you fill up. At the end of your trip or week, fill up your tank again. Record the number of gallons or liters required to fill the tank once again. This is the total number of gallons or liters you used for the trip (or the time period).

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What is the conversion factor for gallons? ›

The gallon used in the United States is equal to exactly 231 cubic inches or 3.785411784 liters. The Imperial gallon or UK gallon is equal to approximately 277.42 cubic inches.

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How do I calculate the gallon capacity of my tank? ›

If you're in the USA:
measure the lengths of all 3 sides.
A little-known fact is 1 gallon = 231 cubic inches.
V = LxW×H (1 gal/231 cubic inches)
For example: my tank is 24 in × 14 in × 12 in.
V = 24 in × 14 in × 12 in = 4,032 cuin.
V = 4,032 cuin (1 gal/231 cuin) = 17.5 gallon.

Jun 3, 2017

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How do you convert area to gallons? ›

To calculate gallons of water per square foot, follow these steps: Convert the height H into feet to get H ft . Multiply H ft by 7.48052 to get gallons of water in one square foot: G = H ft × 7.48052 . Confirm your result using our gallons per square foot calculator.

Measurement	US Customary System
1 Gallon	128 US Fluid Ounces
1 Quart	32 US Fluid Ounces
Conversion (Gallons)	1 US Gallon = 0.832674 Imperial Gallons
Conversion (Quarts)	1 US Quart = 0.832674 Imperial Quarts