Choose a Measurement
Select a measurement and convert between different units
Single conversion
To convert from Fluid Ounce (fl-oz) to Gallon (gal), use the following formula:
Let's convert 5 Fluid Ounce (fl-oz) to Gallon (gal).
Using the formula:
Therefore, 5 Fluid Ounce (fl-oz) is equal to Gallon (gal).
Here are some quick reference conversions from Fluid Ounce (fl-oz) to Gallon (gal):
| Fluid Ounces | Gallons |
|---|---|
| 0.000001 fl-oz | gal |
| 0.001 fl-oz | gal |
| 0.1 fl-oz | gal |
| 1 fl-oz | gal |
| 2 fl-oz | gal |
| 3 fl-oz | gal |
| 4 fl-oz | gal |
| 5 fl-oz | gal |
| 6 fl-oz | gal |
| 7 fl-oz | gal |
| 8 fl-oz | gal |
| 9 fl-oz | gal |
| 10 fl-oz | gal |
| 20 fl-oz | gal |
| 30 fl-oz | gal |
| 40 fl-oz | gal |
| 50 fl-oz | gal |
| 100 fl-oz | gal |
| 1000 fl-oz | gal |
| 10000 fl-oz | gal |
For all Volume converters, choose units using the From/To dropdowns above.
A fluid ounce (fl oz) is a common unit used to measure volume in the imperial and US customary systems.
It tells you how much space a liquid takes up.
This is a common point of confusion: no, they are not the same!
The US fluid ounce is slightly larger than the UK (Imperial) fluid ounce. This slight difference is crucial to remember for recipes and measurements, especially when converting between systems.
The word "ounce" can be tricky because it measures two different things:
A fluid ounce (fl oz) measures volume (how much space something occupies).
An ounce (oz) measures weight (how heavy something is).
Think of it like this: a fluid ounce tells you the size of a container, while a regular ounce tells you how heavy its contents are.
For example, one fluid ounce of honey is much heavier than one fluid ounce of cooking oil because honey has a higher density.
The idea of the fluid ounce has a practical history.
In the British Imperial system, it was initially defined as the volume taken up by one ounce of water at a specific temperature.
This simple link between weight and volume made it a convenient and intuitive unit for measuring everyday liquids like water, wine, and ale for centuries.
A gallon (gal) is a unit of volume, most commonly associated with the imperial and US customary systems of measurement.
It is equal to 128 Fluid Ounces (fl-oz).
A common point of confusion is the difference between the US gallon and the imperial gallon (used in the UK and other Commonwealth nations).
They are not the same size!
This difference stems from historical definitions that were standardized differently in the US and Britain during the 18th and 19th centuries.
So, if you're comparing fuel efficiency, remember that "miles per gallon" ratings are based on different-sized gallons!
The word "gallon" has a rich history, tracing its roots back through several languages.
It originates from the Old Northern French word galon, which referred to a liquid measure.
This term is believed to have originated from the Gallo-Roman word gallēta, meaning a "pail" or "bucket." The ultimate origin likely goes back to a Celtic word, highlighting the unit's long-standing use in European trade and daily life for centuries.
While we typically associate the gallon with liquids, there is also a US dry gallon.
This unit, not commonly used today, is equivalent to one-eighth of a bushel, or about 4.405 liters. It was historically used to measure dry goods such as grain or fruit.
This is also why the famous "10-gallon hat" is a misnomer; its name doesn't refer to its volume.
Instead, it is thought to originate from the Spanish word galón, meaning "braid," which refers to the braided band on the hat.