15 Fluid Ounce (US) to Gallon (US)
Quick answer
15 Fluid Ounce (US) (fl oz) equals
0.117188 gal
To convert 15 Fluid Ounce (US)s to Gallon (US)s, multiply by 0.0078125. Therefore, 15 Fluid Ounce (US) (fl oz) equals 0.117188 Gallon (US) (gal).
Formula: gal = fl oz × 0.0078125. Calculation: 15 × 0.0078125 = 0.117188 gal.
Convert Fluid Ounce (US) (fl oz) to Gallon (US) (gal) online with our free unit converter. In volume, 1 fl oz = 0.007813 gal. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Fluid Ounce (US) to Gallon (US)
- Step 1 — start with the formula. gal = fl oz × 0.0078125
- Step 2 — substitute your figure. 15 fl oz × 0.0078125
- Step 3 — read the result. 15 fl oz = 0.117188 gal
- Step 4 — check it in reverse. fl oz = gal × 128 returns 15.0001 fl oz, which matches the figure you started with.
Volume Converter
40 units available
15 fl oz = 0.117188 gal
Formula:
gal = fl oz × 0.0078125With your value: 15 fl oz = 0.1171875 gal
How big is that?
Everyday references on a logarithmic scale, all expressed in fluid ounce (us) so you can sanity-check the result.
Other Fluid Ounce (US) to Gallon (US) conversions
Fluid Ounce (US) to Gallon (US) Conversion Table
| Fluid Ounce (US) (fl oz) | Gallon (US) (gal) |
|---|---|
| 0.5 | 0.003906 |
| 1 | 0.007813 |
| 2 | 0.015625 |
| 5 | 0.039063 |
| 10 | 0.078125 |
| 15 | 0.117188 |
| 20 | 0.15625 |
| 25 | 0.195313 |
| 50 | 0.390625 |
| 100 | 0.78125 |
| 250 | 1.953125 |
| 500 | 3.90625 |
| 1000 | 7.8125 |
Gallon (US) to Fluid Ounce (US) Conversion Table
| Gallon (US) (gal) | Fluid Ounce (US) (fl oz) |
|---|---|
| 0.5 | 64 |
| 1 | 128 |
| 2 | 256 |
| 5 | 640 |
| 10 | 1,280 |
| 15 | 1,920 |
| 20 | 2,560 |
| 25 | 3,200 |
| 50 | 6,400 |
| 100 | 12,800 |
| 250 | 32,000 |
| 500 | 64,000 |
| 1000 | 128,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Fluid Ounce (US) (fl oz)
Volume
Derived from the cubic metre. The litre is exactly 10⁻³ m³; US and imperial capacity units are exact multiples fixed by statute.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Gallon (US) (gal)
Volume
The US liquid gallon is exactly 231 cubic inches = 3.785 411 784 L.
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Fluid Ounce (US) to Gallon (US)
To convert from Fluid Ounce (US) (fl oz) to Gallon (US) (gal), multiply the value by 0.0078125.
Formula: gal = fl oz × 0.0078125
Reverse: fl oz = gal × 128
Step-by-Step Example
- Start with your value in Fluid Ounce (US). For example: 5 fl oz
- Multiply by the conversion factor: 5 x 0.0078125
- The result is: 0.039063 gal
Fluid Ounce (US) and Gallon (US) Relationship
Both Fluid Ounce (US) and Gallon (US) belong to the US Customary / Imperial system, making this an intra-system conversion within volume. Since 1 Fluid Ounce (US) represents a fraction of a Gallon (US) (1 Gallon (US) ≈ 128 Fluid Ounce (US)s), the Gallon (US) is the larger measurement interval. Understanding the relationship between Fluid Ounce (US) and Gallon (US) is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Fluid Ounce (US)
The US fluid ounce equals approximately 29.57 mL. It is commonly used for beverage and liquid measurements.
Common uses of Fluid Ounce (US): beverages, cooking, cocktails.
About Gallon (US)
The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.
Fun Fact: The US gallon is about 20% smaller than the imperial (UK) gallon.
Common uses of Gallon (US): fuel (US), beverages, swimming pools.
Frequently Asked Questions
- What is 15 Fluid Ounce (US) in Gallon (US)?
- 15 Fluid Ounce (US) equals 0.117188 Gallon (US).
- How many Gallon (US)s are in 1 Fluid Ounce (US)?
- There are exactly 0.0078125 Gallon (US)s in 1 Fluid Ounce (US). This means the conversion factor from Fluid Ounce (US) to Gallon (US) is 0.0078125.
- What is the formula to convert Fluid Ounce (US) to Gallon (US)?
- The formula to convert Fluid Ounce (US) to Gallon (US) is: gal = fl oz × 0.0078125. For example, to convert 10 Fluid Ounce (US)s to Gallon (US)s, you would multiply 10 by 0.0078125.
- What is a Fluid Ounce (US)?
- The US fluid ounce equals approximately 29.57 mL. It is commonly used for beverage and liquid measurements.
- What is a Gallon (US)?
- The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.
- What are the common uses of Fluid Ounce (US)?
- The Fluid Ounce (US) is commonly used in beverages, cooking, cocktails.
Related Volume Conversions
Cite this page
UnitConvertLab. (2026). 15 Fluid Ounce (US) to Gallon (US). UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/15-fluid_ounce_us-to-gallon_us