Fluid Ounces to Gallons (US) Converter
Quick answer: To convert Fluid Ounces to gallons, multiply by 0.0078125. For example, 10 fl oz is 0.078125 gal. One us fluid ounce equals 0.0078125 gal.
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Use the Fluid Ounces to Gallons (US) Converter
Fluid Ounces to Gallons (US) formula and what each symbol means
gal = fl oz × 0.0078125
| Symbol | Meaning |
|---|---|
| fl oz | US fluid ounce |
| gal | US gallon |
Fluid Ounces to Gallons (US) examples
1 fl oz
1 fl oz × 0.0078125 = 0.0078125 gal.
10 fl oz
10 fl oz × 0.0078125 = 0.078125 gal.
100 fl oz
100 fl oz × 0.0078125 = 0.78125 gal.
Fluid Ounces compared with Gallons (US)
One gal is 128 times as large as one fl oz, so your number gets smaller when you convert Fluid Ounces to gallons and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About Fluid Ounces and gallons
US fluid ounce (fl oz): The US fluid ounce, exactly 29.5735295625 millilitres. US gallon (gal): The US liquid gallon, exactly 231 cubic inches or 3.785411784 litres.
Where Fluid Ounces to gallons conversions are used
Fuel, milk and bottled drinks are sold in litres or gallons depending on the country. Tanks, pools and shipping containers are specified in cubic metres or cubic feet.
How to calculate Fluid Ounces to Gallons (US) step by step
- Enter the value in fl oz (the starting unit).
- Multiply by 0.0078125, because 1 fl oz = 0.0078125 gal.
- The product is the value in gal. To go back, divide by 0.0078125 or multiply by 128.
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How to read your Fluid Ounces to Gallons (US) result
Quick estimate: multiply by about 0.0078 to get gallons from Fluid Ounces; this is within 0.2% of the exact factor. The US gallon is exactly 3.785411784 litres and the imperial gallon is exactly 4.54609 litres, about 20% bigger.
| FLUID OUNCES | GALLONS (US) |
|---|---|
| 1 | 0.0078125 |
| 2 | 0.015625 |
| 5 | 0.0390625 |
| 10 | 0.078125 |
| 20 | 0.15625 |
| 50 | 0.390625 |
| 100 | 0.78125 |
| 1,000 | 7.8125 |
Gallons (US) to Fluid Ounces: quick table
| GALLONS (US) | FLUID OUNCES |
|---|---|
| 1 | 128 |
| 5 | 640 |
| 10 | 1,280 |
| 25 | 3,200 |
| 50 | 6,400 |
| 100 | 12,800 |
| 250 | 32,000 |
| 500 | 64,000 |
Common mistakes when calculating Fluid Ounces to Gallons (US)
- Confusing the US fluid ounce (about 29.57 mL) with the imperial fluid ounce (about 28.41 mL).
- Dividing when you should multiply: from fl oz to gal multiply by 0.0078125; from gal to fl oz divide by 0.0078125.
Fluid Ounces to Gallons (US) FAQ
How many gal are in 1 fl oz?
1 fl oz equals 0.0078125 gal.
How many fl oz are in 1 gal?
1 gal equals 128 fl oz.
Is 1 fl oz = 0.0078125 gal an exact conversion?
Yes. The us fluid ounce and the us gallon are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 0.0078125 is just that ratio shown to 7 significant figures.
What is an uS gallon (gal)?
The US liquid gallon, exactly 231 cubic inches or 3.785411784 litres.
How can I estimate Fluid Ounces to gallons in my head?
Quick estimate: multiply by about 0.0078 to get gallons from Fluid Ounces; this is within 0.2% of the exact factor.
What is 500 fl oz in gallons?
500 fl oz = 3.90625 gal (since 500 × 0.0078125).
What is 15 fl oz in gallons?
15 fl oz = 0.1171875 gal (since 15 × 0.0078125).
What is 75 fl oz in gallons?
75 fl oz = 0.5859375 gal (since 75 × 0.0078125).
How many decimals should I keep when converting fl oz to gal?
Match the precision of your original measurement. For example, 0.078125 gal rounds to 0.0781 gal at 3 significant figures; keep more digits only for engineering or scientific work.
More in Volume converters
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- Gallons (US) to Cubic Meters Converter
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- Gallons (US) to Imperial Gallons Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, NIST Handbook 44, Appendix C: units and systems of measurement