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Convert fluid ounces to US gallons. Chart, formula, and reverse direction.
A US fluid ounce (fl oz) is a unit of volume equal to exactly 1/128 of a US gallon. To convert fl oz to gallons, divide by 128; to convert gallons to fl oz, multiply by 128.
1 fl oz equals 0.0078 gal.
| Fluid Ounces (fl oz) | US Gallons (gal) |
|---|---|
| 8 fl oz | 0.0625 gal |
| 16 fl oz | 0.1250 gal |
| 32 fl oz | 0.2500 gal |
| 64 fl oz | 0.5000 gal |
| 100 fl oz | 0.7813 gal |
| 128 fl oz | 1.000 gal |
| 160 fl oz | 1.250 gal |
| 200 fl oz | 1.563 gal |
| 256 fl oz | 2.000 gal |
| 320 fl oz | 2.500 gal |
| 384 fl oz | 3.000 gal |
| 500 fl oz | 3.906 gal |
| 512 fl oz | 4.000 gal |
| 640 fl oz | 5.000 gal |
| 1000 fl oz | 7.813 gal |
| 1280 fl oz | 10.000 gal |
Chart values use the exact US relationship 1 gallon = 128 fl oz. (UK Imperial gallons are larger — 160 UK fl oz.)
Formula
gal = fl oz ÷ 128 | fl oz = gal × 128fl oz = US fluid ounce — US volume unit (1 fl oz = 29.5735 mL)
gal = US liquid gallon — US volume unit (1 gal = 128 fl oz = 3.7854 L)
Worked Example
Convert 64 fl oz to gallons
Did you know? The US gallon (128 fl oz, ≈3.785 L) is based on the British 'wine gallon' of 1707, which had 231 cubic inches. The UK switched to a larger 'imperial gallon' in 1824 (160 UK fl oz, ≈4.546 L), so US and UK gallons have differed ever since.
Sources
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