Convert US fluid ounces to Imperial gallons
1 US fluid ounce is 0.01 gal (UK). One US fluid ounce is exactly 0.00650526706741 imperial gallons.
One US fluid ounce is 0.0065052671 imperial gallons. To convert US fluid ounces to imperial gallons, multiply by 0.0065052671; to go the other way, divide by 0.0065052671 or multiply by 153.72159. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130. Exactly one 128th of a US gallon, which makes it 29.5735295625 ml exactly.
Factor checked against the defining standard · How we check
- US fluid ounces × 0.0065052671
1 * 0.00650530.007 gal (UK)
1 US fluid ounce in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 6 tsp | × 6 |
| US tablespoons | 2 tbsp | × 2 |
| US fluid ounces (as entered) | 1 fl oz | — |
| US cups | 0.125 cup | × 0.125 |
| US pints | 0.0625 pt | × 0.0625 |
| US quarts | 0.03125 qt | × 0.03125 |
| US gallons | 0.0078125 gal | × 0.0078125 |
| milliliters | 29.57352956 ml | × 29.5735295625 |
| liters | 0.02957352956 L | × 0.0295735295625 |
| imperial gallons | 0.006505267067 gal (UK) | × 0.00650526706741 |
| imperial quarts | 0.02602106827 qt (UK) | × 0.0260210682697 |
| imperial pints | 0.05204213654 pt (UK) | × 0.0520421365393 |
| imperial fluid ounces | 1.040842731 fl oz (UK) | × 1.04084273079 |
| imperial gills | 0.2081685462 gi (UK) | × 0.208168546157 |
| cubic millimetres | 29,573.52956 mm³ | × 29,573.5295625 |
| cubic centimetres | 29.57352956 cm³ | × 29.5735295625 |
| cubic inches | 1.8046875 in³ | × 1.8046875 |
| cubic feet | 0.00104437934 ft³ | × 0.00104437934028 |
| cubic yards | 0.00003868071631 yd³ | × 0.0000386807163066 |
| cubic metres | 0.00002957352956 m³ | × 0.0000295735295625 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert US fluid ounces to imperial gallons? The converter and the working
- 1.Take the measurement in US fluid ounces.
- 2.Multiply by 0.0065052671 — that is how many imperial gallons fit in one US fluid ounce.
- 3.To go back the other way, divide by 0.0065052671, or multiply by 153.72159.
Worked example: 25 US fluid ounces to imperial gallons
- Formula
- fl oz × 0.0065052671 = gal (UK)
- Arithmetic
- 25 × 0.0065052671 = 0.16 gal (UK)
- Answer
- 25 fl oz = 0.16 gal (UK)
The factor is rounded for display; the figure above is computed from the full value.
US fluid ounces to imperial gallons conversion table
| US fluid ounces | Imperial gallons |
|---|---|
| 1 fl oz | 0.01 gal (UK) |
| 2 fl oz | 0.01 gal (UK) |
| 3 fl oz | 0.02 gal (UK) |
| 4 fl oz | 0.03 gal (UK) |
| 5 fl oz | 0.03 gal (UK) |
| 6 fl oz | 0.04 gal (UK) |
| 7 fl oz | 0.05 gal (UK) |
| 8 fl oz | 0.05 gal (UK) |
| 9 fl oz | 0.06 gal (UK) |
| 10 fl oz | 0.07 gal (UK) |
| 12 fl oz | 0.08 gal (UK) |
| 15 fl oz | 0.1 gal (UK) |
| 20 fl oz | 0.13 gal (UK) |
| 25 fl oz | 0.16 gal (UK) |
| 50 fl oz | 0.33 gal (UK) |
| 100 fl oz | 0.65 gal (UK) |
| 200 fl oz | 1.3 gal (UK) |
| 300 fl oz | 1.95 gal (UK) |
| 500 fl oz | 3.25 gal (UK) |
| 1000 fl oz | 6.51 gal (UK) |
| 2000 fl oz | 13.01 gal (UK) |
| 5000 fl oz | 32.53 gal (UK) |
| 10000 fl oz | 65.05 gal (UK) |
What is a US fluid ounce?
Exactly one 128th of a US gallon, which makes it 29.5735295625 ml exactly. The imperial fluid ounce is a different unit at exactly 28.4130625 ml, so a UK recipe calling for 10 fl oz means 284 ml and a US one means 296 ml. It is also a volume, not a weight: an ounce of flour is not a fluid ounce of flour.
What is an imperial gallon?
Exactly 4.54609 liters since 1985, and the reason UK and US fuel economy figures cannot be compared: it is 20% larger than the US gallon, so 40 mpg in Britain is about 33 mpg in America on the same car.
How many imperial gallons are in a US fluid ounce?
One US fluid ounce is 0.0065052671 imperial gallons. Going the other way, one imperial gallon is 153.72159 US fluid ounces. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US fluid ounce.
Cite this page
- APA
- Rule Calculator. (2026). Convert US fluid ounces to imperial gallons. Rule Calculator. https://rulecalculators.com/convert/fluid-ounce-to-imperial-gallon
- MLA
- "Convert US fluid ounces to imperial gallons." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/fluid-ounce-to-imperial-gallon.
- Chicago
- Rule Calculator. "Convert US fluid ounces to imperial gallons." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/fluid-ounce-to-imperial-gallon.
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Questions people actually ask
- How many imperial gallons are in a US fluid ounce?
- 0.0065052671. Exactly 4.54609 liters since 1985, and the reason UK and US fuel economy figures cannot be compared: it is 20% larger than the US gallon, so 40 mpg in Britain is about 33 mpg in America on the same car.
- How do I convert imperial gallons back to US fluid ounces?
- Divide by 0.0065052671, or multiply by 153.72159 — they are the same operation.
Other volume conversions
Imperial gallons to US fluid ounces — the same conversion the other way.