Convert Imperial fluid ounces to US gallons
1 imperial fluid ounce is 0.01 gal. One imperial fluid ounce is exactly 0.00750593703441 US gallons.
One imperial fluid ounce is 0.007505937 US gallons. To convert imperial fluid ounces to US gallons, multiply by 0.007505937; to go the other way, divide by 0.007505937 or multiply by 133.22787. 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. One 160th of an imperial gallon, 28.4130625 ml exactly.
Factor checked against the defining standard · How we check
- Imperial fluid ounces × 0.007505937
1 * 0.00750590.008 gal
1 imperial fluid ounce in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 5.764559642 tsp | × 5.76455964242 |
| US tablespoons | 1.921519881 tbsp | × 1.92151988081 |
| US fluid ounces | 0.9607599404 fl oz | × 0.960759940404 |
| US cups | 0.1200949926 cup | × 0.12009499255 |
| US pints | 0.06004749628 pt | × 0.0600474962752 |
| US quarts | 0.03002374814 qt | × 0.0300237481376 |
| US gallons | 0.007505937034 gal | × 0.00750593703441 |
| milliliters | 28.4130625 ml | × 28.4130625 |
| liters | 0.0284130625 L | × 0.0284130625 |
| imperial gallons | 0.00625 gal (UK) | × 0.00625 |
| imperial quarts | 0.025 qt (UK) | × 0.025 |
| imperial pints | 0.05 pt (UK) | × 0.05 |
| imperial fluid ounces (as entered) | 1 fl oz (UK) | — |
| imperial gills | 0.2 gi (UK) | × 0.2 |
| cubic millimetres | 28,413.0625 mm³ | × 28,413.0625 |
| cubic centimetres | 28.4130625 cm³ | × 28.4130625 |
| cubic inches | 1.733871455 in³ | × 1.73387145495 |
| cubic feet | 0.001003397833 ft³ | × 0.00100339783272 |
| cubic yards | 0.00003716288269 yd³ | × 0.0000371628826935 |
| cubic metres | 0.0000284130625 m³ | × 0.0000284130625 |
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 imperial fluid ounces to US gallons? The converter and the working
- 1.Take the measurement in imperial fluid ounces.
- 2.Multiply by 0.007505937 — that is how many US gallons fit in one imperial fluid ounce.
- 3.To go back the other way, divide by 0.007505937, or multiply by 133.22787.
Worked example: 25 imperial fluid ounces to US gallons
- Formula
- fl oz (UK) × 0.007505937 = gal
- Arithmetic
- 25 × 0.007505937 = 0.19 gal
- Answer
- 25 fl oz (UK) = 0.19 gal
The factor is rounded for display; the figure above is computed from the full value.
Imperial fluid ounces to US gallons conversion table
| Imperial fluid ounces | US gallons |
|---|---|
| 1 fl oz (UK) | 0.01 gal |
| 2 fl oz (UK) | 0.02 gal |
| 3 fl oz (UK) | 0.02 gal |
| 4 fl oz (UK) | 0.03 gal |
| 5 fl oz (UK) | 0.04 gal |
| 6 fl oz (UK) | 0.05 gal |
| 7 fl oz (UK) | 0.05 gal |
| 8 fl oz (UK) | 0.06 gal |
| 9 fl oz (UK) | 0.07 gal |
| 10 fl oz (UK) | 0.08 gal |
| 12 fl oz (UK) | 0.09 gal |
| 15 fl oz (UK) | 0.11 gal |
| 20 fl oz (UK) | 0.15 gal |
| 25 fl oz (UK) | 0.19 gal |
| 50 fl oz (UK) | 0.38 gal |
| 100 fl oz (UK) | 0.75 gal |
| 200 fl oz (UK) | 1.5 gal |
| 300 fl oz (UK) | 2.25 gal |
| 500 fl oz (UK) | 3.75 gal |
| 1000 fl oz (UK) | 7.51 gal |
| 2000 fl oz (UK) | 15.01 gal |
| 5000 fl oz (UK) | 37.53 gal |
| 10000 fl oz (UK) | 75.06 gal |
What is an imperial fluid ounce?
One 160th of an imperial gallon, 28.4130625 ml exactly. The US fluid ounce is one 128th of a smaller gallon at 29.57 ml, so the two ounces differ by about 4% in the opposite direction to the gallons.
What is a US gallon?
Exactly 231 cubic inches. The imperial gallon is 4.546 liters, so US and UK fuel economy figures are not comparable.
How many US gallons are in an imperial fluid ounce?
One imperial fluid ounce is 0.007505937 US gallons. Going the other way, one US gallon is 133.22787 imperial 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 an imperial fluid ounce.
Cite this page
- APA
- Rule Calculator. (2026). Convert Imperial fluid ounces to US gallons. Rule Calculator. https://rulecalculators.com/convert/imperial-fluid-ounce-to-gallon
- MLA
- "Convert Imperial fluid ounces to US gallons." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/imperial-fluid-ounce-to-gallon.
- Chicago
- Rule Calculator. "Convert Imperial fluid ounces to US gallons." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/imperial-fluid-ounce-to-gallon.
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Questions people actually ask
- How many US gallons are in an imperial fluid ounce?
- 0.007505937. Exactly 231 cubic inches. The imperial gallon is 4.546 liters, so US and UK fuel economy figures are not comparable.
- How do I convert US gallons back to imperial fluid ounces?
- Divide by 0.007505937, or multiply by 133.22787 — they are the same operation.
Other volume conversions
US gallons to imperial fluid ounces — the same conversion the other way.