Volume Conversion: 1 US gallon = 128 US fluid ounces (fl oz) | Supports standard notation display for daily use
Accurate conversion between US fluid ounces (fl oz) and US gallons (gal) for cooking, baking, beverage preparation, and household liquid measurements.
Conversion Factor
1 US gallon (gal) = 128 US fluid ounces (fl oz) | 1 US fluid ounce (fl oz) = 1/128 gallon (gal)
Precision: 2 Decimal Places | Formula: gal = fl oz ÷ 128
Understanding these essential liquid volume units for daily cooking, baking, and household tasks.
Ounce to Gallon Conversion (US Units)
1 US gallon (gal) = 128 US fluid ounces (fl oz)
1 US fluid ounce (fl oz) = 1/128 US gallon (gal) ≈ 0.0078125 gal
Gallons = Fluid Ounces ÷ 128
Fluid Ounces = Gallons × 128
Convert 256 fluid ounces to gallons:
gal = fl oz ÷ 128
gal = 256 ÷ 128
gal = 2.00 (with 2 decimal places)
Convert 0.75 gallons to fluid ounces:
fl oz = gal × 128
fl oz = 0.75 × 128
fl oz = 96.00 (with 2 decimal places)
Note: US fluid ounces differ from UK imperial ounces (1 UK gal = 160 UK fl oz)
A small volume unit in the US customary system, used for measuring liquids in recipes, beverages, and personal care products. Note: Fluid ounces (volume) ≠ ounces (weight).
Practical reference points:
Key Fact: 1 US fl oz = 29.57 mL; 1 UK fl oz = 28.41 mL (not interchangeable)
A large volume unit in the US customary system, used for measuring bulk liquids like water, milk, fuel, and cleaning products. Equals 4 quarts or 8 pints.
Practical reference points:
Key Fact: 1 US gal = 128 fl oz; 1 UK gal = 160 fl oz (3.785L vs 4.546L)
| Unit | Abbreviation | Fluid Ounces (fl oz) | Gallons (gal) | Typical Use |
|---|---|---|---|---|
| Gallon | gal | 128 fl oz | 1 gal | Bulk liquids (milk, water) |
| Quart | qt | 32 fl oz | 0.25 gal | Ice cream, large beverages |
| Pint | pt | 16 fl oz | 0.125 gal | Milk cartons, beer |
| Cup | c | 8 fl oz | 0.0625 gal | Cooking, coffee, tea |
| Fluid Ounce | fl oz | 1 fl oz | ~0.0078 gal | Small recipes, beverages |
| Tablespoon | tbsp | 0.5 fl oz | ~0.0039 gal | Spices, oil, condiments |
Common questions about ounces, gallons, and US customary liquid volume conversions.
A US gallon contains exactly 128 US fluid ounces. This is a standard conversion in the US customary system for liquid volume measurements. The relationship can be expressed in multiple ways for clarity:
1 US gallon (gal) = 128 US fluid ounces (fl oz)
1 US fluid ounce (fl oz) = 1/128 US gallon (gal) ≈ 0.0078125 gal
Ounces to Gallons: gal = fl oz ÷ 128
Gallons to Ounces: fl oz = gal × 128
This conversion is critical for everyday tasks like following recipes, comparing beverage sizes, or calculating how many small bottles fit into a gallon container.
US and UK (imperial) liquid volume units are not interchangeable – there are key differences in both fluid ounces and gallons:
This converter uses US customary units (1 gal = 128 fl oz). Always check recipe or product labels to confirm unit type to avoid measurement errors.
The terms "ounce" and "fluid ounce" are often confused, but they measure different properties:
Example 1: 8 fl oz of water weighs ~8 oz (due to water’s density), but this is a coincidence – not a rule.
Example 2: 8 fl oz of oil weighs ~7.5 oz (oil is less dense than water).
Example 3: 8 fl oz of honey weighs ~12 oz (honey is more dense than water).
This distinction is critical for cooking and baking: use fluid ounces for liquids and ounces (or cups) for solids to ensure recipe accuracy.
Precision requirements vary by task – most everyday uses don’t need extreme decimal places:
This converter defaults to 2 decimal places, which balances accuracy and readability for most home and kitchen needs. You can adjust precision from 0 to 6 decimal places using the "Precision Selection" buttons.
Here are practical conversion examples for everyday products, using the formula Gallons = Fluid Ounces ÷ 128:
Use the "Quick Calculation Shortcuts" on the converter to instantly get these common values without manual input.
Common liquid volume conversions for everyday use, with standard notation.
| Fluid Ounces (fl oz) | Gallons (gal) | Equivalent Units | Common Use Case |
|---|---|---|---|
| 1 | 0.0078 | 2 tablespoons | Small spice measurement |
| 8 | 0.0625 | 1 cup | Coffee, cooking oil |
| 16 | 0.125 | 1 pint | Milk carton, beer |
| 16.9 | 0.132 | N/A (standard bottle) | Disposable water bottle |
| 32 | 0.25 | 1 quart | Ice cream, large beverage |
| 64 | 0.5 | 2 quarts | Half-gallon milk jug |
| 96 | 0.75 | 3 quarts | Large cooking pot |
| 128 | 1.00 | 4 quarts | Full gallon milk/water |
| 256 | 2.00 | 8 quarts | Bulk beverage storage |
| 640 | 5.00 | 20 quarts | Water cooler bottle |
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