US Fluid Ounces to Imperial Gallons Converter
Convert US fluid ounces to Imperial gallons instantly with this free US fluid ounces to Imperial 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 Imperial gallons?
1 US fluid ounce is equal to 0.006505267 Imperial gallons.
1 ÷ 153.72159 = 0.006505267 Imperial gallons
1 US fluid ounce = 0.0065052671 Imperial gallons
US fluid ounces to Imperial gallons formula
imp gal = fl oz ÷ 153.72159
The US fluid ounces to Imperial gallons conversion factor is 0.006505267067, which is exact by definition. 1 US fluid ounce = 0.006505267067 Imperial gallons, and 1 Imperial gallon = 153.721590465 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 Imperial gallon.
Worked examples
- 2 US fluid ounces = 0.013010534 Imperial gallons — 2 ÷ 153.72159 = 0.013010534 Imperial gallons
- 6 US fluid ounces = 0.039031602 Imperial gallons — 6 ÷ 153.72159 = 0.039031602 Imperial gallons
- 10 US fluid ounces = 0.065052671 Imperial gallons — 10 ÷ 153.72159 = 0.065052671 Imperial gallons
US fluid ounces to Imperial gallons conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| US fluid ounces (fl oz) | Imperial gallons (imp gal) |
|---|---|
| 1 fl oz | 0.00650527 imp gal |
| 2 fl oz | 0.01301053 imp gal |
| 3 fl oz | 0.0195158 imp gal |
| 4 fl oz | 0.02602107 imp gal |
| 5 fl oz | 0.03252634 imp gal |
| 6 fl oz | 0.0390316 imp gal |
| 7 fl oz | 0.04553687 imp gal |
| 8 fl oz | 0.05204214 imp gal |
| 9 fl oz | 0.0585474 imp gal |
| 10 fl oz | 0.06505267 imp gal |
| 12 fl oz | 0.0780632 imp gal |
| 15 fl oz | 0.09757901 imp gal |
| 20 fl oz | 0.13010534 imp gal |
| 25 fl oz | 0.16263168 imp gal |
| 30 fl oz | 0.19515801 imp gal |
| 50 fl oz | 0.32526335 imp gal |
| 75 fl oz | 0.48789503 imp gal |
| 100 fl oz | 0.65052671 imp gal |
| 500 fl oz | 3.2526335 imp gal |
| 1,000 fl oz | 6.5052671 imp gal |
When you need to convert US fluid ounces to Imperial 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.
Imperial gallon (imp gal)
- An Imperial gallon is about 1.2 US gallons
- UK fuel prices are quoted per litre, not per gallon
Common mistakes to avoid
- Dividing when you should multiply. Because 1 US fluid ounce = 0.006505 Imperial 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.
- Imperial gallon (imp gal): Exactly 4.54609 liters — the gallon used in the UK and historically in Canada. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
- Imperial 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 US liquid gallons
- US fluid ounces to Imperial pints
Frequently asked questions
- What is 1 US fluid ounce in Imperial gallons?
- 1 US fluid ounce is equal to 0.006505267 Imperial gallons.
- How many US fluid ounces are in one Imperial gallon?
- There are 153.72159 US fluid ounces in 1 Imperial gallon.
- How do you convert US fluid ounces to Imperial gallons?
- Multiply the number of US fluid ounces by 0.006505267 — or use the formula imp gal = fl oz ÷ 153.72159.
- What is 6 US fluid ounces in Imperial gallons?
- 6 US fluid ounces is 0.039031602 Imperial gallons. 6 ÷ 153.72159 = 0.039031602 Imperial gallons.
- Is the US fluid ounces to Imperial gallons conversion exact?
- Yes. The relationship is fixed by definition, so 0.006505267067 is an exact conversion factor — only the displayed result is rounded.
- Does this use US or Imperial Imperial 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 Imperial gallon.