Quick answer: 1 Fluid Ounce (US) in Gallon (US)
1 fl oz equals 0.0078125 gal. To convert Fluid Ounce (US) to Gallon (US), multiply by 0.0078125 using the free calculator above — no signup needed.
Volume & Capacity units
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About Volume & Capacity Converter
The Volume & Capacity Converter converts between 8 different units, including Liter, Milliliter, Cubic Meter, Gallon (US), Quart (US). The base unit is the Liter, and every other unit on this page is defined as an exact multiple of it. Type any value into the calculator above to convert instantly — free, unlimited, no signup and nothing to install.
Common equivalents: 1 Liter = 1000 Milliliter, 0.001 Cubic Meter, 0.264172 Gallon (US).
Scale of this category: the smallest unit is the Milliliter (mL) and the largest is the Cubic Meter (m³).
Last updated: 2026-09-15
Volume & Capacity conversion factors
| Unit | Symbol | Value in Liter |
|---|---|---|
| Liter | L | 1 L = 1 L |
| Milliliter | mL | 1 mL = 0.001 L |
| Cubic Meter | m³ | 1 m³ = 1000 L |
| Gallon (US) | gal | 1 gal = 3.785412 L |
| Quart (US) | qt | 1 qt = 0.946353 L |
| Pint (US) | pt | 1 pt = 0.473176 L |
| Cup (US) | cup | 1 cup = 0.24 L |
| Fluid Ounce (US) | fl oz | 1 fl oz = 0.0295735 L |
Worked Examples
See exactly how the conversion works with real numbers, step by step.
How much is 1 Fluid Ounce (US) in Gallon (US)?
- Multiply 1 by the conversion factor 0.0078125
- 1 Fluid Ounce (US) = 0.0078125 Gallon (US)
How much is 100 Fluid Ounce (US) in Gallon (US)?
- Multiply 100 by the conversion factor 0.0078125
- 100 Fluid Ounce (US) = 0.78125 Gallon (US)
How much is 1000 Fluid Ounce (US) in Gallon (US)?
- Multiply 1000 by the conversion factor 0.0078125
- 1000 Fluid Ounce (US) = 7.8125 Gallon (US)
Quick Conversion Reference Table
| Fluid Ounce (US) (fl oz) | Gallon (US) (gal) |
|---|---|
| 1 fl oz (Fluid Ounce (US)) | 0.0078125 gal (Gallon (US)) |
| 2 fl oz (Fluid Ounce (US)) | 0.015625 gal (Gallon (US)) |
| 5 fl oz (Fluid Ounce (US)) | 0.0390625 gal (Gallon (US)) |
| 10 fl oz (Fluid Ounce (US)) | 0.078125 gal (Gallon (US)) |
| 20 fl oz (Fluid Ounce (US)) | 0.15625 gal (Gallon (US)) |
| 50 fl oz (Fluid Ounce (US)) | 0.390625 gal (Gallon (US)) |
| 100 fl oz (Fluid Ounce (US)) | 0.78125 gal (Gallon (US)) |
| 500 fl oz (Fluid Ounce (US)) | 3.90625 gal (Gallon (US)) |
| 1000 fl oz (Fluid Ounce (US)) | 7.8125 gal (Gallon (US)) |
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FAQ
How much is 1 Fluid Ounce (US) in Gallon (US)?
1 Fluid Ounce (US) = 0.0078125 Gallon (US).
How do I convert Fluid Ounce (US) to Gallon (US)?
Enter your value in Fluid Ounce (US) into the converter above and the result in Gallon (US) appears instantly. 1 fl oz equals 0.0078125 gal — just multiply your value by 0.0078125.
What is the formula for Fluid Ounce (US) to Gallon (US)?
The formula is: value in Gallon (US) = value in Fluid Ounce (US) × 0.0078125. For example, 100 fl oz × 0.0078125 = 0.78125 gal.
Is this Fluid Ounce (US) to Gallon (US) converter free and accurate?
Yes. This Fluid Ounce (US) to Gallon (US) converter is 100% free, uses the exact international conversion factor (0.0078125), and works on any device with no signup.
How do I convert Gallon (US) back to Fluid Ounce (US)?
To convert back, divide by 0.0078125 (or multiply by 128). You can also use our dedicated How Many Fluid Ounce (US) in 1 Gallon (US)? page for instant results.
Do I need to download an app or sign up?
No. The converter runs entirely in your browser — nothing to install, no account, no fees. It even keeps working offline once the page has loaded.
Which Volume & Capacity units are supported?
This converter supports 8 units: Liter, Milliliter, Cubic Meter, Gallon (US), Quart (US), Pint (US), Cup (US), Fluid Ounce (US).