US fluid ounces to US gallons

US gallons = US fluid ounces × 0.0078125

How to convert US fluid ounces to US gallons

One US fluid ounce is 0.0078125 US gallons, so multiply the number of US fluid ounces by 0.0078125. For example, 20 US fluid ounces is 20 × 0.0078125 = 0.15625 US gallons. To go back, divide by the same number, or multiply by 128.

Quick estimate

Multiplying by about 0.008 gets within 2.4% of the exact answer, which is enough to check that a result makes sense.

Where it comes up

Volume conversions come up in recipes, fuel economy, drink and bottle sizes, garden and pool water, and engine sizes.

US fluid ounces	US gallons
1 floz	0.0078125 gal
2 floz	0.015625 gal
3 floz	0.0234375 gal
4 floz	0.03125 gal
5 floz	0.0390625 gal
6 floz	0.046875 gal
7 floz	0.0546875 gal
8 floz	0.0625 gal
9 floz	0.0703125 gal
10 floz	0.078125 gal
11 floz	0.0859375 gal
12 floz	0.09375 gal
13 floz	0.1015625 gal
14 floz	0.109375 gal
15 floz	0.1171875 gal
16 floz	0.125 gal
17 floz	0.1328125 gal
18 floz	0.140625 gal
19 floz	0.1484375 gal
20 floz	0.15625 gal
25 floz	0.1953125 gal
30 floz	0.234375 gal
40 floz	0.3125 gal
50 floz	0.390625 gal
60 floz	0.46875 gal
70 floz	0.546875 gal
75 floz	0.5859375 gal
80 floz	0.625 gal
90 floz	0.703125 gal
100 floz	0.78125 gal
120 floz	0.9375 gal
150 floz	1.171875 gal
200 floz	1.5625 gal
250 floz	1.953125 gal
300 floz	2.34375 gal
400 floz	3.125 gal
500 floz	3.90625 gal
750 floz	5.859375 gal
1,000 floz	7.8125 gal
1,500 floz	11.71875 gal
2,000 floz	15.625 gal
5,000 floz	39.0625 gal
10,000 floz	78.125 gal

Questions

How many US gallons are in a US fluid ounce?

0.0078125 US gallons.

How do I convert US fluid ounces to US gallons in a spreadsheet?

Put the value in A1 and type =A1*0.0078125, then fill the formula down the column.

Are the values in the table exact?

They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.