Convert Fluid Ounces (US) to Gallons (US)
fl oz to gal · volume conversion
What are fluid ounces (us) and gallons (us)?
A US fluid ounce is about 29.57 mL, used for liquids and beverages. A US gallon is 4 quarts (about 3.785 L), the standard unit for fuel and large liquids in the US. For scale: a standard water bottle holds about 500 mL (17 fl oz), and a US gallon is 3.785 L.
How to convert fluid ounces (us) to gallons (us)
1 fl oz = 0.00781249 gal. To convert, multiply the number of fluid ounces (us) by 0.00781249. For example, 5 fl oz = 0.0390625 gal, and 20 fl oz = 0.15625 gal. To go the other way, multiply gallons (us) by 128 (since 1 gal = 128 fl oz).
Fluid Ounces (US) to Gallons (US) conversion table
| Fluid Ounces (US) (fl oz) | Gallons (US) (gal) |
|---|---|
| 1 | 0.00781249 |
| 2 | 0.015625 |
| 5 | 0.0390625 |
| 10 | 0.0781249 |
| 20 | 0.15625 |
| 50 | 0.390625 |
| 100 | 0.781249 |
FAQ
What is 1 fl oz in gal?
1 fl oz = 0.00781249 gal. To convert any amount, multiply the number of fluid ounces (us) by 0.00781249.
How do I convert gallons (us) back to fluid ounces (us)?
Go the other way: 1 gal = 128 fl oz, so multiply gallons (us) by 128 to get fluid ounces (us).
Is a fluid ounces (us) bigger than a gallons (us)?
No — 1 fl oz is the smaller unit, equal to 0.00781249 gal (it takes 128 fl oz to make one gal).
Are these volume conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.