US Fluid Ounces to US Liquid Gallons Converter
Convert US fluid ounces to US liquid gallons instantly with this free US fluid ounces to US liquid gallons converter. Enter any value to get an accurate volume conversion, plus the formula, the conversion factor and a full reference table.
What is 1 US fluid ounce in US liquid gallons?
1 US fluid ounce is equal to exactly 0.0078125 US liquid gallons.
1 ÷ 128 = 0.0078125 US liquid gallons
1 US fluid ounce = 0.0078125 US liquid gallons
US fluid ounces to US liquid gallons formula
gal = fl oz ÷ 128
The US fluid ounces to US liquid gallons conversion factor is 0.0078125, which is exact by definition. 1 US fluid ounce = 0.0078125 US liquid gallons, and 1 US liquid gallon = 128 US fluid ounces.
Regional note. Gallons differ by region. A US liquid gallon is exactly 3.785411784 liters; an Imperial (UK) gallon is exactly 4.54609 liters — about 20% larger. This page uses the US liquid gallon.
Worked examples
- 2 US fluid ounces = 0.015625 US liquid gallons — 2 ÷ 128 = 0.015625 US liquid gallons
- 6 US fluid ounces = 0.046875 US liquid gallons — 6 ÷ 128 = 0.046875 US liquid gallons
- 10 US fluid ounces = 0.078125 US liquid gallons — 10 ÷ 128 = 0.078125 US liquid gallons
US fluid ounces to US liquid gallons conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| US fluid ounces (fl oz) | US liquid gallons (gal) |
|---|---|
| 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 |
| 7 fl oz | 0.0546875 gal |
| 8 fl oz | 0.0625 gal |
| 9 fl oz | 0.0703125 gal |
| 10 fl oz | 0.078125 gal |
| 12 fl oz | 0.09375 gal |
| 15 fl oz | 0.1171875 gal |
| 20 fl oz | 0.15625 gal |
| 25 fl oz | 0.1953125 gal |
| 30 fl oz | 0.234375 gal |
| 50 fl oz | 0.390625 gal |
| 75 fl oz | 0.5859375 gal |
| 100 fl oz | 0.78125 gal |
| 500 fl oz | 3.90625 gal |
| 1,000 fl oz | 7.8125 gal |
When you need to convert US fluid ounces to US liquid gallons
- Scaling recipes between metric millilitres and US cups, pints or fluid ounces.
- Comparing fuel prices and tank capacities between countries.
- Working out paint, fertiliser or pool chemical quantities from instructions written for another market.
Getting a feel for the scale
A converted number is easier to trust when you can picture it. These reference points let you sanity-check the result at a glance.
US liquid gallon (gal)
- A US milk jug is 1 gallon
- A mid-size car tank holds 12–16 US gallons
Common mistakes to avoid
- Dividing when you should multiply. Because 1 US fluid ounce = 0.007813 US liquid gallons, the answer should be smaller than the number you started with.
- Mixing US and Imperial liquid measures. The Imperial gallon and pint are about 20% larger than their US counterparts, which is enough to ruin a recipe or misstate fuel economy.
- Confusing the fluid ounce (a volume) with the ounce (a weight). They are different quantities and only coincide for water by rough approximation.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
Cooking tolerates rounding to the nearest 5 mL or quarter cup. Dosing, chemistry and pool treatment do not — keep the full converted value there.
How these units are defined
- US fluid ounce (fl oz): 1/128 of a US gallon, about 29.57 mL. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- US liquid gallon (gal): Exactly 3.785411784 liters — the gallon used in the United States. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
- US liquid gallons to US fluid ounces
- US fluid ounces to Milliliters
- US fluid ounces to Liters
- US fluid ounces to Cubic meters
- US fluid ounces to Cubic feet
- US fluid ounces to US teaspoons
- US fluid ounces to US tablespoons
- US fluid ounces to US cups
- US fluid ounces to US liquid pints
- US fluid ounces to US liquid quarts
- US fluid ounces to Imperial pints
- US fluid ounces to Imperial gallons
Frequently asked questions
- What is 1 US fluid ounce in US liquid gallons?
- 1 US fluid ounce is equal to 0.0078125 US liquid gallons.
- How many US fluid ounces are in one US liquid gallon?
- There are 128 US fluid ounces in 1 US liquid gallon.
- How do you convert US fluid ounces to US liquid gallons?
- Multiply the number of US fluid ounces by 0.0078125 — or use the formula gal = fl oz ÷ 128.
- What is 6 US fluid ounces in US liquid gallons?
- 6 US fluid ounces is 0.046875 US liquid gallons. 6 ÷ 128 = 0.046875 US liquid gallons.
- Is the US fluid ounces to US liquid gallons conversion exact?
- Yes. The relationship is fixed by definition, so 0.0078125 is an exact conversion factor — only the displayed result is rounded.
- Does this use US or Imperial US liquid gallons?
- Gallons differ by region. A US liquid gallon is exactly 3.785411784 liters; an Imperial (UK) gallon is exactly 4.54609 liters — about 20% larger. This page uses the US liquid gallon.