Convert US fluid ounces to liters instantly. Exact NIST factor, free, no sign-up required.
Quick Answer: One US fluid ounce equals 0.0295735 liters. To convert oz to liters, multiply by 0.0295735. Common values: 8 oz = 0.237 L · 16 oz = 0.473 L · 32 oz = 0.946 L · 64 oz = 1.893 L · 128 oz = 3.785 L.
Formula: liters = fl oz × 0.0295735295625
Need to go from liters back to fluid ounces? Our liter to oz converter handles the reverse calculation.
Liters = Fluid Ounces × 0.0295735295625
Fluid Ounces = Liters × 33.8140226
One US fluid ounce is exactly 29.5735295625 ml by international definition. Dividing that by 1000 gives the liter factor: 0.0295735295625 L per fl oz. This is not a rounded value — it is the exact legal definition used in all US customary calculations.
| Fluid Ounces (fl oz) | Liters (L) | Milliliters (ml) | US Equivalent |
|---|---|---|---|
| 1 fl oz | 0.02957 L | 29.57 ml | 2 tablespoons |
| 2 fl oz | 0.05915 L | 59.15 ml | ¼ cup |
| 4 fl oz | 0.11829 L | 118.29 ml | ½ cup |
| 6 fl oz | 0.17744 L | 177.44 ml | ¾ cup |
| 8 fl oz | 0.23659 L | 236.59 ml | 1 cup |
| 12 fl oz | 0.35488 L | 354.88 ml | 1½ cups / soda can |
| 16 fl oz | 0.47318 L | 473.18 ml | 1 pint / 2 cups |
| 20 fl oz | 0.59147 L | 591.47 ml | 2½ cups |
| 24 fl oz | 0.70976 L | 709.76 ml | 3 cups |
| 32 fl oz | 0.94635 L | 946.35 ml | 1 quart / 4 cups |
| 33.814 fl oz | 1.000 L | 1,000 ml | exactly 1 liter |
| 40 fl oz | 1.18294 L | 1,182.94 ml | 5 cups |
| 64 fl oz | 1.89271 L | 1,892.71 ml | ½ gallon / 8 cups |
| 96 fl oz | 2.83906 L | 2,839.06 ml | ¾ gallon / 12 cups |
| 128 fl oz | 3.78541 L | 3,785.41 ml | 1 gallon / 16 cups |
Most beverages are produced in metric volumes and labeled with the fl oz equivalent. Knowing these real-world anchor points makes future conversions instant mental math.
| Container / Product | Metric Volume | Fluid Ounces | Notes |
|---|---|---|---|
| Mini water bottle | 250 ml / 0.25 L | 8.45 fl oz | kids' lunch size |
| Standard water bottle | 500 ml / 0.5 L | 16.9 fl oz | US grocery standard |
| Large sport bottle | 750 ml / 0.75 L | 25.4 fl oz | wine bottle volume |
| 1-liter bottle | 1,000 ml / 1 L | 33.8 fl oz | gym / trail bottle |
| Large water bottle | 1,500 ml / 1.5 L | 50.7 fl oz | common European size |
| 2-liter soda bottle | 2,000 ml / 2 L | 67.6 fl oz | US grocery standard |
| US gallon jug | 3,785 ml / 3.785 L | 128 fl oz | 1 US gallon |
Why 16.9 oz = 500 ml: Bottled water is manufactured in metric volumes. The 500 ml bottle calculates to 16.907 fl oz, which rounds to 16.9 on the US label. The metric figure is exact — the oz label is derived.
Recipes from outside the US often specify liquids in liters or milliliters. This table bridges the most common cooking volumes between the two systems.
| Recipe Calls For | In Liters | In Fluid Ounces | US Cup Equivalent |
|---|---|---|---|
| 1 tablespoon liquid | 0.01479 L | 0.5 fl oz | — |
| ¼ cup | 0.05915 L | 2 fl oz | ¼ cup |
| ½ cup | 0.11829 L | 4 fl oz | ½ cup |
| 1 cup | 0.23659 L | 8 fl oz | 1 cup |
| 1 metric cup (250 ml) | 0.25 L | 8.45 fl oz | 1 cup + 1 tbsp |
| 2 cups / 1 pint | 0.47318 L | 16 fl oz | 2 cups |
| 4 cups / 1 quart | 0.94635 L | 32 fl oz | 4 cups |
| 1 liter | 1.000 L | 33.81 fl oz | 4 cups + 1.5 tbsp |
The trickiest swap: a metric cup (250 ml) is slightly larger than a US cup (236.6 ml). For baking, this 13 ml difference per cup can compound across multiple cups of liquid and affect texture. When precision matters, measure in ml directly. See our liquid measurement conversion chart for a full cross-reference of all units.
The US customary system defines volume through fractions of a gallon. The metric system defines volume through fractions of a liter. The two systems meet at the liter-to-gallon conversion:
| US Unit | fl oz | Liters | Metric Closest |
|---|---|---|---|
| 1 tablespoon | 0.5 | 0.0148 | 15 ml |
| 1 cup | 8 | 0.237 | 250 ml (metric cup) |
| 1 pint | 16 | 0.473 | 500 ml |
| 1 quart | 32 | 0.946 | 1 liter (close) |
| 1 gallon | 128 | 3.785 | 4 × 1 L bottles |
A US quart (0.946 L) and a liter are often treated as interchangeable in casual cooking, but the 54 ml gap between them equals about 3.5 tablespoons — enough to matter in bread baking or custards. For gallon-based conversions, our oz to gallon calculator and oz to ml converter cover the full unit family.
For mental conversions without reaching for a calculator:
Conversion factor sourced from the NIST SI Units guide for volume — the official US measurement authority.
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