Water in ounces and liters, side by side.
64 oz is 1.89 liters. 2 liters is 67.6 oz. 3 liters is 101.4 oz. 1 US gallon (128 oz) is 3.79 liters. One liter is 33.8 US fluid ounces, about 4.2 cups of 8 oz.
To turn ounces into liters, multiply by 0.0296 (or divide by 33.8). To turn liters into ounces, multiply by 33.8. These are US customary ounces (29.5735 mL); the UK imperial ounce is 28.4 mL.
Dropkin, a water tracker for iPhone and Apple Watch, asks whether you measure in oz or mL and liters on its first screen and shows the other unit next to your goal. This page only converts numbers; how much you drink is your choice and this is not medical advice.
Ounces to liters
| US fl oz | Liters | 8 oz cups |
|---|---|---|
| 32 US fl oz | 0.95 L | 4 cups |
| 48 US fl oz | 1.42 L | 6 cups |
| 64 US fl oz | 1.89 L | 8 cups |
| 72 US fl oz | 2.13 L | 9 cups |
| 80 US fl oz | 2.37 L | 10 cups |
| 96 US fl oz | 2.84 L | 12 cups |
| 100 US fl oz | 2.96 L | 12.5 cups |
| 128 US fl oz | 3.79 L | 16 cups |
Liters to ounces
| Liters | US fl oz | 8 oz cups |
|---|---|---|
| 1 L | 33.8 US fl oz | 4.2 cups |
| 1.5 L | 50.7 US fl oz | 6.3 cups |
| 2 L | 67.6 US fl oz | 8.5 cups |
| 2.5 L | 84.5 US fl oz | 10.6 cups |
| 3 L | 101.4 US fl oz | 12.7 cups |
| 3.5 L | 118.3 US fl oz | 14.8 cups |
| 4 L | 135.3 US fl oz | 16.9 cups |
How to set a daily water tracking goal (with sources)
How many ounces are in a liter of water?
One liter is 33.8 US fluid ounces. Half a liter (500 mL) is 16.9 oz, the size of a standard bottled water.
Is 64 oz of water 2 liters?
Close, but a little less. 64 US fl oz is 1.89 liters. Two liters is 67.6 oz, about half a cup more.
How many ounces is 2 liters?
2 liters is 67.6 US fluid ounces, or about 8.5 cups of 8 oz.
How many ounces is 3 liters?
3 liters is 101.4 US fluid ounces, about 12.7 cups of 8 oz or six 500 mL bottles.
How many liters is 100 oz of water?
100 US fl oz is 2.96 liters, just under 3 L.
How many 16.9 oz bottles make 64 oz?
About 3.8 bottles. Four 16.9 oz (500 mL) bottles make 2 liters, or 67.6 oz.
Can one water tracker show ounces and liters?
Yes. Dropkin lets you pick oz or mL and liters on the very first screen, suggests the unit your region uses, and switches anytime in Settings. Your history converts instantly because it is stored precisely in mL.