Convert Fluid Ounces (US) to Gallons (US)
One fluid ounce (US) equals 0.0078125 gallons (us). Type any value to convert fluid ounces (us) to gallons (us) instantly — with a full reference table below.
Convert Fluid Ounces (US) to Gallons (US)
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How to convert Fluid Ounces (US) to Gallons (US)
To convert fluid ounces (us) to gallons (us), multiply by 0.0078125. One fluid ounce (US) equals 0.0078125 gal, and one gallon (US) equals 128 fl oz.
- Take the value in fluid ounces (us) — for example 7.5 fl oz.
- Multiply by 0.0078125 (the number of gallons (us) in one fluid ounce (US)).
- 7.5 × 0.0078125 = 0.0585938 gal.
Quick mental estimate: Divide the number of fluid ounces (us) by 128 — that is exact.
Fluid Ounces (US) to Gallons (US) conversion table
| Fluid Ounces (US) | Gallons (US) |
|---|---|
| 1 fl oz | 0.0078125 gal |
| 2 fl oz | 0.015625 gal |
| 3 fl oz | 0.0234375 gal |
| 4 fl oz | 0.03125 gal |
| 5 fl oz | 0.0390625 gal |
| 6 fl oz | 0.046875 gal |
| 8 fl oz | 0.0625 gal |
| 10 fl oz | 0.078125 gal |
| 12 fl oz | 0.09375 gal |
| 16 fl oz | 0.125 gal |
| 20 fl oz | 0.15625 gal |
| 24 fl oz | 0.1875 gal |
| 32 fl oz | 0.25 gal |
| 50 fl oz | 0.390625 gal |
| 100 fl oz | 0.78125 gal |
| Gallons (US) | Fluid Ounces (US) |
|---|---|
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 3 gal | 384 fl oz |
| 4 gal | 512 fl oz |
| 5 gal | 640 fl oz |
| 6 gal | 768 fl oz |
| 8 gal | 1,024 fl oz |
| 10 gal | 1,280 fl oz |
| 12 gal | 1,536 fl oz |
| 16 gal | 2,048 fl oz |
| 20 gal | 2,560 fl oz |
| 24 gal | 3,072 fl oz |
| 32 gal | 4,096 fl oz |
| 50 gal | 6,400 fl oz |
| 100 gal | 12,800 fl oz |
About converting Fluid Ounces (US) to Gallons (US)
Fluid Ounces (US) (fl oz) and Gallons (US) (gal) are both units of volume. The exact factor is 1 fl oz = 0.0078125 gal, so multiply by 0.0078125 to go from fluid ounces (us) to gallons (us) (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Gallons (US) to Fluid Ounces (US) converter, or the full unit converter for every unit at once.
Real-world volume in fluid ounces (us) and gallons (us)
| Example | Fluid Ounces (US) | Gallons (US) |
|---|---|---|
| A US soda can (12 fl oz) | 12 fl oz | 0.09375 gal |
| A wine bottle | 25.36052 fl oz | 0.198129 gal |
| A US gallon of milk | 128 fl oz | 1 gal |
| A typical car fuel tank | ≈ 1,690.701 fl oz | ≈ 13.2086 gal |
| A typical bathtub | ≈ 5,072.103 fl oz | ≈ 39.62581 gal |
“≈” marks typical values; the rest are defined or measured figures.
The units
The US fluid ounce: 1/128 US gallon, 29.5735295625 mL.
Used for: US drink and cosmetics labels.
The US liquid gallon: 231 cubic inches, exactly 3.785411784 L. (The UK imperial gallon is larger: 4.54609 L.)
Used for: US fuel and milk.
US customary volumes are exact by definition: the US gallon is 231 cubic inches, which is exactly 3.785411784 litres.