One liter is 33.81 US fluid ounces. NIST gives the US fluid ounce as 29.57353 mL, so liters × 33.814 gives fluid ounces and fluid ounces × 0.02957 gives liters. A 2-liter bottle is 67.63 fl oz, and a 500 mL bottle is 16.91 fl oz. In the UK, a liter is 35.20 imperial fluid ounces.
How many ounces are in a liter?
A liter is 1,000 mL. The US fluid ounce is 29.57353 mL (NIST SP 811), so 1,000 ÷ 29.57353 = 33.814 fl oz. The imperial fluid ounce is 28.41306 mL, which gives 1,000 ÷ 28.41306 = 35.195 imperial fl oz per liter. Both are volumes, not weights; see ounces in a cup for the distinction.
Formulas
US fl oz = liters × 33.814
liters = US fl oz × 0.029574 (or ÷ 33.814)
imperial fl oz = liters × 35.195
The converters liters to oz, oz to liters and ml to oz accept any value.
Liters to ounces chart
| Liters | US fluid ounces | Imperial fluid ounces |
|---|---|---|
| 0.25 L (250 mL) | 8.45 | 8.80 |
| 0.33 L (330 mL) | 11.16 | 11.61 |
| 0.355 L (355 mL) | 12.00 | 12.49 |
| 0.5 L | 16.91 | 17.60 |
| 0.75 L | 25.36 | 26.40 |
| 1 L | 33.81 | 35.20 |
| 1.5 L | 50.72 | 52.79 |
| 2 L | 67.63 | 70.39 |
| 3 L | 101.44 | 105.59 |
Ounces to liters chart
| US fluid ounces | Milliliters | Liters |
|---|---|---|
| 8 | 236.6 | 0.237 |
| 12 | 354.9 | 0.355 |
| 16 | 473.2 | 0.473 |
| 20 | 591.5 | 0.591 |
| 32 | 946.4 | 0.946 |
| 64 | 1,892.7 | 1.893 |
| 128 | 3,785.4 | 3.785 |
Worked examples
Example 1: a 2-liter bottle
A 2 L bottle holds 2 ÷ 0.0295735 = 67.63 fl oz. In US customary cups (236.588 mL each) that is 2,000 ÷ 236.588 = 8.45 cups.
Example 2: a daily water goal
A goal of 64 fl oz is 64 × 29.57353 = 1,892.7 mL, or 1.89 L. A goal of 3 L is 101.4 fl oz, which is 0.79 gal (see liters in a gallon).
Example 3: a 330 mL can
A 330 mL can is 330 ÷ 29.57353 = 11.16 fl oz. A 12 fl oz can is 354.9 mL, 7.5% more than 330 mL.
Example 4: the label rule
Under 21 CFR 101.9(b)(5)(viii), 1 fl oz means 30 mL on a nutrition label. A 1 L drink therefore reads as 1,000 ÷ 30 = 33.3 fl oz on a label, while the true value is 33.8 fl oz. The label figure is 1.4% lower (30 ÷ 29.57353 = 1.014).
Example 5: an imperial pint
Twenty imperial fluid ounces are 20 × 28.41306 = 568.3 mL, which is only 19.2 US fluid ounces (568.26 ÷ 29.57353). The same volume gives a different ounce count under each system.
Is a liter more than a quart?
Yes. A US liquid quart is 0.9463529 L (NIST), so 1 L = 1.0567 quarts, about 5.7% more. A liter is also 4.23 US cups (1,000 ÷ 236.588). Pints, quarts and gallons are laid out in ounces in a gallon, and liters to quarts converts any amount.
Quick ways to remember
- 1 L is about 34 fl oz (33.8 exactly).
- 500 mL is about 17 fl oz, and 2 L is about 68 fl oz.
- Labels round: a drink shown as "33.8 fl oz" is exactly a liter; "33 fl oz" or "34 fl oz" is usually rounding.
- US and UK ounces differ by 4% (29.57 vs 28.41 mL). The metric vs imperial guide lists other differences.