Also available in our
Android app, with charts and full breakdown tables.
Rate this calculator
Was it useful? A quick star rating helps others — and you can leave a comment too.
Rate it:
★
★
★
★
★
⚡ US Gallons to Imperial Fluid Ounces: the quick answer
1 gal = 133.228 fl oz-uk
1 US gallon equals 133.228 imperial fluid ounces
To convert US gallons to imperial fluid ounces, multiply the value by 133.228.
To go the other way, multiply imperial fluid ounces by 0.00750594 to get US gallons.
↔ Convert imperial fluid ounces to US gallons instead
🧮 Formula
Every unit here is defined by its volume in cubic meters, so the conversion factor is (cubic meters per US gallon) ÷ (cubic meters per imperial fluid ounce).
📊 US Gallons to Imperial Fluid Ounces conversion table
✏️ Worked examples
Convert 25 US gallons to imperial fluid ounces
25 gal × 133.228 = 3,330.7 fl oz-uk
Try this example →
Convert 250 US gallons to imperial fluid ounces
250 gal × 133.228 = 33,307 fl oz-uk
Try this example →
📘 About these units
US gallon (gal). The US liquid gallon is 231 cubic inches, exactly 3.785411784 liters.
Imperial fluid ounce (fl oz-uk). An imperial fluid ounce is 28.413 mL, used on British drink labels.
❓ Frequently asked questions
How many imperial fluid ounces are in one US gallon?
There are 133.228 imperial fluid ounces in one US gallon.
How do I convert US gallons to imperial fluid ounces?
Multiply the number of US gallons by 133.228. For example, 10 US gallons equal 1,332.28 imperial fluid ounces.
How many US gallons are in one imperial fluid ounce?
One imperial fluid ounce equals 0.00750594 US gallons.
🔗 More volume conversions
All volume units →