Convert Fluid Ounces (US) to US Gallons
Convert Fluid Ounces (US) to US Gallons instantly. 1 Fluid Ounce (US) (fl oz) equals 0.007813 US Gallons (gal (US)).
Fluid Ounces (US) to US Gallons conversion table
| Fluid Ounces (US) (fl oz) | US Gallons (gal (US)) |
|---|---|
| 1 fl oz | 0.007813 gal (US) |
| 2 fl oz | 0.01563 gal (US) |
| 3 fl oz | 0.02344 gal (US) |
| 5 fl oz | 0.03906 gal (US) |
| 10 fl oz | 0.07813 gal (US) |
| 20 fl oz | 0.1563 gal (US) |
| 50 fl oz | 0.3906 gal (US) |
| 100 fl oz | 0.7813 gal (US) |
| 500 fl oz | 3.9063 gal (US) |
| 1,000 fl oz | 7.8125 gal (US) |
1 Fluid Ounce (US) = 0.007813 US Gallons · multiply Fluid Ounces (US) by 0.007813
About converting Fluid Ounces (US) to US Gallons
Fluid Ounces (US) (fl oz) and US Gallons (gal (US)) are both units of volume, so converting between them is a single multiplication: multiply your Fluid Ounces (US) figure by 0.007813. Ten Fluid Ounces (US) comes to 0.07813 US Gallons, and a hundred works out at 0.7813 US Gallons.
Rule of thumb: going from Fluid Ounces (US) to US Gallons divides, so the figure always shrinks — it takes about 128 Fluid Ounces (US) to make a single US Gallon. If your answer came out bigger, you have the conversion the wrong way round.
What is a Fluid Ounce (US)?
A fluid ounce measures volume, not weight, despite sharing a name with the ounce on a kitchen scale — the two are related only loosely, through the weight of water. The US and imperial fluid ounces are different sizes, and counterintuitively the imperial one is the smaller, even though the imperial gallon is the bigger of the two: the imperial gallon divides into 160 fluid ounces, the US gallon into just 128. The gap is small enough to slip past a reader and large enough to matter, which makes it a reliable trap in cocktail recipes and drink can sizes.
What is an US Gallon?
The US gallon is defined as exactly 231 cubic inches, a figure inherited unchanged from the old English wine gallon. When Britain overhauled its measures in 1824 and adopted a new imperial gallon, the United States simply kept the wine gallon it already had — and that single decision is the root of the entire US-versus-imperial mess that still catches people out today. The US gallon is roughly a fifth smaller than the imperial one, which means American and British fuel-economy figures are not comparable even though both are quoted in miles per gallon.
To put both in perspective: a US shot of spirits is about one and a half fluid ounces, while a typical American milk jug holds one US gallon.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the US Gallons to Fluid Ounces (US) converter, or browse all Volume converters.
Frequently asked questions
How many US Gallons are in one Fluid Ounce (US)?
There are 0.007813 US Gallons in one Fluid Ounce (US).
How do I convert Fluid Ounces (US) to US Gallons?
Multiply the number of Fluid Ounces (US) by 0.007813. For example, 10 Fluid Ounces (US) = 0.07813 US Gallons.
What is 100 Fluid Ounces (US) in US Gallons?
100 Fluid Ounces (US) is equal to 0.7813 US Gallons.
How do I convert US Gallons to Fluid Ounces (US)?
Multiply the US Gallons value by 128 (or divide by 0.007813).
Is this Fluid Ounces (US) to US Gallons conversion exact?
The definition is exact — Fluid Ounces (US) and US Gallons are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a Fluid Ounce (US)?
A fluid ounce measures volume, not weight, despite sharing a name with the ounce on a kitchen scale — the two are related only loosely, through the weight of water. The US and imperial fluid ounces are different sizes, and counterintuitively the imperial one is the smaller, even though the imperial gallon is the bigger of the two: the imperial gallon divides into 160 fluid ounces, the US gallon into just 128. The gap is small enough to slip past a reader and large enough to matter, which makes it a reliable trap in cocktail recipes and drink can sizes.
What is an US Gallon?
The US gallon is defined as exactly 231 cubic inches, a figure inherited unchanged from the old English wine gallon. When Britain overhauled its measures in 1824 and adopted a new imperial gallon, the United States simply kept the wine gallon it already had — and that single decision is the root of the entire US-versus-imperial mess that still catches people out today. The US gallon is roughly a fifth smaller than the imperial one, which means American and British fuel-economy figures are not comparable even though both are quoted in miles per gallon.