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Convert fl oz to gal
1 fl oz = 0.0078125 gal
Type a value in US fluid ounces and the answer in US gallons appears as you go. The conversion is exactly 0.0078125 gal to the us fluid ounce, and it happens on your own machine — this page asks nothing of a server once it has loaded.
Where it runs
In your browser. The number you type is never part of a request.
Exact by definition
1 fl oz is exactly 0.0078125 gal — a definition, not a rounded factor.
Answers as you type
No button, no wait. The worked answer is already on the page before any script runs.
US fluid ounce and US gallon
A US fluid ounce is 29.57 ml; a UK one is 28.41 ml. They are different units with the same name, and recipes rarely say which they mean.
A US gallon is defined as 231 cubic inches, exactly — a definition that comes from an English wine gallon of 1707. The imperial gallon is 4.55 litres, about 20% larger.
US fluid ounces to US gallons in practice
12 fl oz is 0.09375 gal
— a US drinks can.
8 fl oz is 0.0625 gal
— a US cup, as a recipe means it.
US fluid ounces to US gallons at a glance
| fl oz | gal |
|---|---|
| 1 | 0.0078125 |
| 2 | 0.015625 |
| 3 | 0.0234375 |
| 5 | 0.0390625 |
| 10 | 0.078125 |
| 20 | 0.15625 |
| 50 | 0.390625 |
| 100 | 0.78125 |
Every figure here is computed from the same definition the calculator uses, so the table cannot drift away from the answer above it.
Convert fl oz to gal: common questions
How many US gallons are in a us fluid ounce?
Exactly 0.0078125. One us fluid ounce is 0.0078125 US gallons, and the box above will do it for any figure you type.
Is this conversion exact, or rounded?
The ratio is exact. It is not a rounded constant typed into a table: it is derived from the definitions of the two units, so it agrees with any other correct converter to as many digits as you care to compare.
Why does another converter show a slightly different number?
Almost always rounding rather than disagreement. Many converters cut the answer to two or four decimals, and some carry a factor that was rounded before the multiplication rather than after. The figures here are computed from the exact definitions and only rounded on the way to the screen.
Where these figures come from
The claims this page makes about volume units are checkable, and these are the documents that settle them.
How this page works
The factor is a constant in the page and the arithmetic is four operations, so nothing is sent anywhere and nothing needs to be. The number you type never leaves the browser — there is no request for it to travel in.