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? ›

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

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How do I calculate cost per gallon? ›

Cost Per Gallon Formula

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

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How do you calculate gallons from size? ›

Formula:

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

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How to calculate water tank capacity in gallons? ›

To find the capacity of a rectangular or square tank: Multiply length (L) by width (W) to get area (A). Multiply area by height (H) to get volume (V). Multiply volume by 7.48 gallons per cubic foot to get capacity (C).

How to calculate for gallons? ›

As there are 7.48 gallons in a cubic foot, multiply width by length by depth to find the volume in cubic feet, then multiply by 7.48. I have an air tank, 12" x 12" x 18", that says it is 10 gallons.

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How do you measure 1 gallon? ›

Know Your Conversion: Understanding the basic conversions can be very helpful. For example, 1 gallon = 128 fluid ounces, 1 gallon = 4 quarts, 1 gallon = 8 pints, and 1 gallon = 16 cups.

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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 cost of 1 gallon of gas? ›

Today's average price of gas in the U.S. is $3.37 per gallon, down $0.01 from yesterday, $0.06 from last week and $0.13 from last month. The average price of a gallon of gas one year ago today was $3.85.

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How do you calculate gallons in a gas 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

How do I calculate water volume? ›

Multiply the base area by the height to find the volume in cubic metres (m3). 6. Multiply the volume in cubic metres (m3) by 1,000 (1 cubic metre of water is equal to 1,000 litres) to find the volume in litres (L). In this example, the rain barrel or cistern can hold 219 litres of water.

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How to calculate the volume? ›

Height × width × length= volume

If the height, width and length are measured in cm, the answer will be cm³.

How do I calculate what size water tank I need? ›

As a general rule of thumb, each square metre of roof space collects around 1 litre of water for every 1 millimetre of rainfall received. Using the calculation of (x) square metres of roof space available for connection to your tank multiplied by the amount of rainfall will help guide your decision.

What is the formula for calculation of water tank? ›

Let length be L, Breadth be B, and Height be H. So, if we take: L = 8ft B = 6 ft D/H = 5 ft Then the volume of the tank will be 8 x 6 x 5 = 240 ft³ We all know that 1ft³ is equivalent to 28.31 liter Therefore, the total volume of tank in liters will be 240 x 28.31 = 6794.4 liter.

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How many gallons does my tank hold? ›

(Length x depth x height) = volume in cubic inches. Divide that number by 277.42 will give you the volume in Imperial Gallons. If you need US Gallons, then multiply your final number by 1.125. Easy.

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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.

What is 1 gallon in math? ›

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.

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What is equivalent to 1 gallon? ›

In the US Customary system, 1 US gallon (gal) is equal to 128 US fluid ounces (fl oz). So, to convert any number of US fluid ounces to US gallons, simply divide the number of fluid ounces by 128.

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How many cups are 1 gallon? ›

16 US cups

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