5 US gal to US fl oz — 5 US gallons in US fluid ounces
Exact 5 × 128 = 640
18 litres 927 millilitres
5 US gallons in other units
| Millilitres | 18,927.06 | mL |
|---|---|---|
| Litres | 18.927059 | L |
| Cubic metres | 0.01892706 | m³ |
| US teaspoons | 3,840 | tsp |
| US tablespoons | 1,280 | tbsp |
| US fluid ounces | 640 | US fl oz |
| US cups | 80 | US cup |
| US pints | 40 | US pt |
| US quarts | 20 | US qt |
| Imperial fluid ounces | 666.139348 | imp fl oz |
| Imperial pints | 33.306967 | imp pt |
| Imperial gallons | 4.163371 | imp gal |
| Cubic feet | 0.66840278 | ft³ |
| Cubic inches | 1,155 | in³ |
| Oil barrels | 0.11904762 | bbl |
US gal to US fl oz at a glance
| US gallons | US fluid ounces |
|---|---|
| 1 US gal | 128 US fl oz |
| 2 US gal | 256 US fl oz |
| 3 US gal | 384 US fl oz |
| 5 US gal | 640 US fl oz |
| 10 US gal | 1,280 US fl oz |
| 20 US gal | 2,560 US fl oz |
| 25 US gal | 3,200 US fl oz |
| 50 US gal | 6,400 US fl oz |
| 100 US gal | 12,800 US fl oz |
| 250 US gal | 32,000 US fl oz |
| 500 US gal | 64,000 US fl oz |
| 1,000 US gal | 128,000 US fl oz |
How to convert US gallons to US fluid ounces
Multiply by 128 — one US gallon is 128 US fluid ounces. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 5 × 128 = 640
In words: six hundred forty US fluid ounces.
What these units are
The US gallon and the US fluid ounce are covered in the volume unit guide, along with every other unit on this page.
Questions
How many US fluid ounces are in a US gallon?
One US gallon is 128 US fluid ounces. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 5 US gallons in US fluid ounces?
5 US gallons is 640 US fluid ounces. The working is 5 × 128 = 640.
Is a gallon the same in the US and the UK?
No. A US gallon is 3.785411784 litres; an Imperial gallon is 4.54609 litres. The Imperial one is about 20% larger, which is why US and UK fuel economy figures for the same car look different.
Which pint does a recipe mean?
Follow the recipe's origin. A US pint is 16 US fluid ounces, roughly 473 mL. An Imperial pint is 20 Imperial fluid ounces, roughly 568 mL. A British pint of milk is noticeably more than an American one.
Can I convert litres to kilograms here?
Not directly — that depends on what you are measuring. Volume becomes mass only once you know the density. Water is the convenient case: one litre is almost exactly one kilogram. Oil, flour and alcohol are all lighter.
Why is a US cup not 250 mL?
The US legal cup is 240 mL and the customary cup used in recipes is about 236.6 mL. The round 250 mL cup is the Australian and metric standard. In baking the gap is enough to notice.