Convert gallons to ounces
1 gal = 128 fl oz
1 fl oz = 0.0078125 gal
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How to convert gallons to ounces
Multiply the value in gallons by 128 to get ounces. As a formula: fl oz = gal × 128
Good to know
A US gallon is exactly 128 US fluid ounces. Health advice of 'half a gallon of water a day' is 64 fl oz, or about 1.9 litres.
gallons to ounces conversion table
| gallons (gal) | ounces (fl oz) |
|---|---|
| 0.5 gal | 64 fl oz |
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 3 gal | 384 fl oz |
| 4 gal | 512 fl oz |
| 5 gal | 640 fl oz |
| 6 gal | 768 fl oz |
| 8 gal | 1,024 fl oz |
| 10 gal | 1,280 fl oz |
| 12 gal | 1,536 fl oz |
| 15 gal | 1,920 fl oz |
| 20 gal | 2,560 fl oz |
| 25 gal | 3,200 fl oz |
| 30 gal | 3,840 fl oz |
| 50 gal | 6,400 fl oz |
| 75 gal | 9,600 fl oz |
| 100 gal | 12,800 fl oz |
| 250 gal | 32,000 fl oz |
| 500 gal | 64,000 fl oz |
| 1,000 gal | 128,000 fl oz |
Related conversions
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- liters to gallons
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- quarts to gallons
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Need other units? The full Volume Converter converts between every unit it supports, and the Unit Converters page lists the rest.
gallons to ounces — questions
How many ounces are in 1 gal?
1 gal = 128 fl oz. Multiply the value in gallons by 128 to get ounces.
How do I convert gallons to ounces?
Multiply the value in gallons by 128. For example, 0.5 gal × 128 = 64 fl oz.
What is 0.5 gal in ounces?
0.5 gal = 64 fl oz.
What is 2 gal in ounces?
2 gal = 256 fl oz.
What is 5 gal in ounces?
5 gal = 640 fl oz.