Gallon Calculator | Gallon Converter (2024)

Last updated:May 18, 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 I calculate gallons needed? ›

The capacity in gallons is equal to the volume in cubic feet multiplied by 7.48 gallons per cubic foot. For a rectangular tank: To find the capacity of a rectangular or square tank: Multiply length (L) by width (W) to get area (A).

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.

How many gallons are in my tank? ›

For square and rectangular tanks, all you have to do is measure the length, width, and depth of the tank, then multiply them together and divide by 231, the number of cubic inches in a gallon.

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How many gallons is my pool calculator? ›

Length x width x depth x 7.5 = volume (in gallons)

Length times width gives the surface area of the pool. Multiplying that by the depth gives the volume in cubic feet. Since there are 7.5 gallons in each cubic foot, multiply the cubic feet of the pool by 7.5 to arrive at the volume of the pool, expressed in gallons.

How many gallons of water will I need? ›

The recommended daily water intake for males is slightly less than a gallon. For females, it is a little over 4 cups less. Your individual water needs may be greater than the recommendation, depending on the temperature, your activity level, and whether you are pregnant or breastfeeding, among other factors.

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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.

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How to calculate tank capacity? ›

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 do I calculate the volume of my tank? ›

The volume of a fish tank is calculated by multiplying its length, width, and height. If you have a 3ft by 2ft tank, and let's say it's 2ft high, the volume would be 3ft x 2ft x 2ft = 12 cubic feet.

How many gallons is usually a full tank? ›

How Many Gallons of Gas Can a Car Hold On Average? Most vehicles' average fuel tank capacity is between 10.5 and 18.5 gallons. Smaller vehicles like subcompact crossovers and other hatchback models generally hover somewhere around 12 gallons.

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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.

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How big is a 30000 gallon pool? ›

20' x 40'

How big is a 20,000 gallon pool? ›

How much water do I have in my pool?

Size	48″ Shallow to 96″ Deep end
16' x 32'	20,000
18' x 36'	25,000
20' x 40'	30,000
24' x 44'	45,000

2 more rows

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How do I know how many gallons my car needs? ›

Generally, you should calculate your mpg as follows:

Fill up your gas tank and drive 100 miles.
Once you've crossed the set mark, go back to the gas station and fill up again. Take note of how many gallons it takes.
Divide the 100 miles by that number, and here's your fuel economy.

Dec 29, 2022

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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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How many gallons do I need per square foot? ›

7.48 is a the number of gallons in a square foot of space.

How do you calculate water tank capacity? ›

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