How Many Liters In A Gallon: Liters to Gallons and Gallons to Liters
Liters and gallons are both units of volume, and understanding the relationship between them is crucial in many fields, including Electrical Engineering, science, cooking, industrial applications, everyday activities, etc.
To make things interesting, not only do both US and Imperial liquid gallons consist of different amounts of liters, but there are also dry gallons as a unit of volume, which may lead to certain confusion.
Published: March 25, 2024
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Liters to Gallons and Gallons to Liters Conversion Calculators
In order to convert (liquid/fluid) ounces to gallons and gallons to ounces, feel free to use the following conversion calculators (we will explain the units later in this article).
Note: write the value that You have and click 'Calculate' to convert it:
Liters to US Liquid Gallons and US Liquid Gallons to Liters Converters


Liters to US Dry Gallons and US Dry Gallons to Liters Converters


Liters to Imperial Gallons and Imperial Gallons to Liters Converters


Relations Between the Units
When somebody asks how many liters are in a gallon, note that a gallon is a unit of volume, but which one?
Note that there are US (Fluid) Gallons, US Dry Gallons, and Imperial Gallons  obviously, they are nonSI units of volume. Their relations with ounces (nonSI, but used quite often) and liters (SI system unit of volume) are as follows:
 1 US Fluid Ounce (fl oz) = 1/128 US Liquid Gallon = 29.5735295625 milliliters
 1 US Liquid Gallon = 231 inch^{3} = 128 US Fluid Ounces (fl oz) = 3.785411784 liters
 1 Imp Fluid Ounce = 1/160 Imp Liquid Gallon = 28.4130625 milliliters
 1 Imp Liquid Gallon = 160 Imp Fluid Ounces = 4.54609 liters
 1 US Dry Gallon = 1/8 US Bushel = 4.40488377086 liters
 1 US Ounce = 1 Imp Ounce = 28.349523125 grams
As one can see, US ounces and Imperial ounces are units of weight, while others are units of volume. However, the US Dry Gallon is a unit of volume and is/was used to measure the weight of dry stuff, like corn, wheat, etc.
Note: to make comparison easier between all of these units, liters and milliliters are also given for each unit, except US Ounce, which is given in grams (1 gram ≈ 1 milliliter of water at 4°C).
So, to convert the volume given in US Dry and Liquid gallons and Imperial gallons into volume in liters and vice versa, we can use these formulas:
V_{(liters)} = V_{(US gallon)} * 3.785411784 → V_{(US gallon)} = V_{(liters)} / 3.785411784_{}
V_{(liters)} = V_{(US dry gal)} * 4.40488377086 → V_{(US dry gal)} = V_{(liters)} / 4.40488377086
V_{(liters)} = V_{(Imp gallon)} * 4.54609 → V_{(Imp gallon)} = V_{(liters)} / 4.54609 _{}
Liters to Gallons and Gallons to Liters Conversion Charts
Here are some liters to gallons quick conversion charts to aid You with unit conversions:








For more values, feel free to use the conversion calculators.
Liters to Gallons and Gallons to Liters Examples
In these examples, we assume the use of US Fluid Gallons  if you need to calculate other gallons, keep in mind their relation to liters.
1 Gallon to Liters:
To convert a volume of 1 gal to liters, we write:
1 gal = 1 gal * 3.785411784 l/gal = 3.785411784 liters
5 Gallons to Liters:
To convert a volume of 5 gal to liters, we write:
5 gal = 5 gal * 3.785411784 l/gal = 18.92705892 liters
10 Gallons to Liters:
To convert a volume of 10 gal to liters, we write:
10 gal = 10 gal * 3.785411784 l/gal = 37.85411784 liters
1 Liter to Gallons:
To convert a volume of 1 liter to gallons, we write:
1 liter = 1 l / 3.785411784 gal/l = ~0.264172 gallons
2 Liters to Gallons:
To convert a volume of 2 liters to gallons, we write:
2 liter = 2 l / 3.785411784 gal/l = ~0.528344 gallons
3 Liters to Gallons:
To convert a volume of 3 liters to gallons, we write:
3 liter = 3 l / 3.785411784 gal/l = ~0.792516 gallons
4 Liters to Gallons:
To convert a volume of 4 liters to gallons, we write:
4 liters = 4 l / 3.785411784 gal/l = ~1.056688 gallons
5 Liters to Gallons:
To convert a volume of 5 liters to gallons, we write:
5 liters = 5 l / 3.785411784 gal/l = ~1.320860 gallons
10 Liters to Gallons:
To convert a volume of 10 liters to gallons, we write:
10 liters = 10 l / 3.785411784 gal/l = ~2.641720 gallons
Brief History About Liters and Gallons
The measurement of volume has always been essential in trade, science, and daily life, leading to the development of various units, such as liters and gallons. Understanding the history, relationship, and standardization of these units provides insight into their significance in the metric and imperial systems.
Liters: The Metric Measure of Volume
The liter, symbolized as 'L' or 'l', is the metric system unit of volume, which is widely used across the globe due to its convenience and standardization under the International System of Units (SI).
The origin of the liter can be traced back to France in the late 18th century, during a period of significant scientific development and standardization. The term "liter" was first introduced in 1795, derived from an older French unit called "litron," which was itself a variant of the medieval Latin term "litra," denoting a measure of weight or capacity.
The definition of a liter has undergone several changes over time.
Initially, it was defined as the volume of 1 kilogram of water at its maximum density, which occurs at about 4°C. However, this definition was found to be impractical for precise standardization.
In 1901, the liter was redefined as the volume of one cubic decimeter (dm^{3}), a more straightforward definition that facilitated accuracy and ease of use.
Gallons: A Tale of Varieties
The gallon has a more complex history, with different versions used in various parts of the world. Its name is derived from the Latin "galleta," meaning a wine container.
Unlike the liter, the gallon does not have a single standardized definition and is used in two main forms: the US gallon and the imperial gallon, with a notable mention of the US dry gallon.
 US Liquid Gallon: Commonly used in the United States, the US liquid gallon is defined as exactly 231 cubic inches, which is approximately 3.785 liters. This definition was based on the English wine gallon, which was used in the United Kingdom before the American Revolution.
 US Dry Gallon: Less commonly used, the US dry gallon is defined as 1/8th of a US Winchester bushel, equivalent to exactly 4.40488377086 liters. It is primarily used for measuring dry commodities.
 Imperial Gallon: Used in the British Commonwealth and some Caribbean states, the imperial gallon was defined in 1824 as the volume of 10 pounds of water at a temperature of 62°F. This equals approximately 4.54609 liters, making it larger than the US gallon. The imperial gallon was designed to simplify trade and measurement in the British Empire.
Relation and Standardization
The relationship between liters and gallons highlights the differences between the metric system and the various systems used in the British and American contexts. The metric system, with the liter at its core, is characterized by its decimalbased standardization, which simplifies calculations and conversions.
In contrast, the gallon, whether in its US or imperial form, reflects the historical complexities and regional variations of measurement systems before global standardization efforts.
The transition to the metric system in many parts of the world was driven by the need for a universal and coherent measurement system, facilitating international trade, scientific research, and technical exchanges.
While the United States still primarily uses the US customary units, including the gallon, for everyday measurements, the liter and the metric system have been adopted by most countries and in scientific and industrial applications globally.
Modern Usage and Conversion
Today, the liter and gallon are used side by side in different contexts, with the liter prevailing in scientific and international applications due to its SI standardization. The gallon remains deeply ingrained in the everyday life of countries like the United States and the United Kingdom, though the UK has increasingly adopted metric units.
Conversion between liters and gallons is a common necessity, with 1 US gallon being equal to approximately 3.785 liters and 1 imperial gallon equal to about 4.54609 liters. These conversions are crucial in activities ranging from cooking and vehicle fuel efficiency to industrial processes and scientific calculations.
Liters and Gallons in Electrical Engineering
In the realm of Electrical Engineering, units like liters and gallons might not seem immediately relevant, given the field's focus on electrical and electronic principles. However, these units of volume find their place in several areas within electrical engineering, emphasizing the interdisciplinary nature of engineering problems and solutions.
Understanding the importance and use of liters and gallons can provide insights into the practical challenges and applications electrical engineers face.
Cooling Systems for Electrical Equipment
One of the primary uses of volume measurements in electrical engineering is in the design and maintenance of cooling systems for electrical equipment. Highpower transformers, generators, and power electronics often require liquid cooling systems to dissipate heat efficiently.
In such contexts, the capacity of cooling and insulating liquids, such as transformer oil or coolant in a heat exchanger, is measured in liters or gallons. Engineers must calculate the volume of these fluids required to achieve optimal thermal management, ensuring that electrical systems operate within safe temperature ranges.
Battery Technologies
The development and implementation of battery technologies, especially for electric vehicles (EVs) and largescale energy storage systems, also see the application of liters and gallons.
The volume of electrolytes, which are crucial for the operation of batteries like leadacid or flow batteries, is often quantified in liters. This measurement is vital for designing batteries that balance energy density, weight, and performance.
As the demand for more efficient and highercapacity batteries grows, the precise calculation of electrolyte volume becomes increasingly important for electrical engineers.
Enclosures and Housing
Electrical engineering also involves designing enclosures and housing for electronic equipment, where volume measurements are essential.
For instance, specifying the size of a cabinet for a power distribution unit or the housing for a complex electronic system requires understanding its volume capacity, often considered in liters, to ensure adequate space for all components while optimizing for size and cost. This is especially critical in applications where space is at a premium, such as in aerospace or automotive industries.
Environmental and Sustainability Considerations
With a growing emphasis on sustainability and environmental protection, electrical engineers are increasingly involved in projects related to water treatment and renewable energy installations, such as hydroelectric power plants or cooling systems for solar panels.
In these cases, the capacity of reservoirs, tanks, and other containment solutions is expressed in gallons or liters. Such measurements are crucial for designing systems that are both efficient and environmentally friendly, highlighting the role of electrical engineering in addressing global challenges.
Power Generators
Fuel tank capacities and oil capacities are often expressed in US fluid gallons and liters, allowing owners to calculate how much fuel and oil they actually need easily.
The amount of oil is also very often measured in ounces.
While liters and gallons are traditionally associated with fields requiring volume measurements like chemistry or civil engineering, their importance in electrical engineering cannot be overlooked.
From cooling systems for electrical equipment to the development of advanced battery technologies and the design of electronic enclosures, these units of volume play a crucial role in various applications.
They underscore the interdisciplinary nature of electrical engineering challenges and the need for engineers to possess a broad knowledge base that extends beyond purely electrical or electronic concepts.