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Convert US fluid ounces to milliliters instantly with our free online calculator. Essential for cooking, beverage measurement, medical dosing, and recipe conversion between imperial and metric systems.
29.5735
Milliliters per Fluid Ounce
0.0338
Fluid Ounces per Milliliter
236.588 mL
In 8 fl oz (1 Cup)
Formula: Milliliters = Fluid Ounces × 29.5735
| Fluid Ounces | Milliliters | Common Use |
|---|---|---|
| 1 fl oz | 29.57 mL | Medicine dose, shot glass |
| 2 fl oz | 59.15 mL | Small medicine cup |
| 4 fl oz | 118.29 mL | Half cup, small juice glass |
| 6 fl oz | 177.44 mL | Small coffee cup |
| 8 fl oz | 236.59 mL | Standard cup, coffee mug |
| 12 fl oz | 354.88 mL | Soda can, beer can |
| 16 fl oz | 473.18 mL | Pint, large coffee |
| 20 fl oz | 591.47 mL | Large water bottle |
| 24 fl oz | 709.76 mL | Medium beverage |
| 32 fl oz | 946.35 mL | Quart, large drink |
| 33.8 fl oz | 1000.00 mL | One liter (exact) |
| 64 fl oz | 1892.71 mL | Half gallon |
| 128 fl oz | 3785.41 mL | One gallon |
A fluid ounce (abbreviated fl oz or fl. oz.) is a unit of volume used primarily in the United States for measuring liquids. The US fluid ounce is precisely defined as 29.5735295625 milliliters (often rounded to 29.5735 mL for practical use). It is part of the US customary system of measurement, which evolved from the British imperial system but has some key differences. Importantly, there are two types of fluid ounces: the US fluid ounce and the UK (Imperial) fluid ounce, which equals 28.4131 milliliters — about 4% smaller than the US version.
A milliliter (abbreviated mL or ml) is a metric unit of volume equal to one-thousandth of a liter. It is defined as exactly 1 cubic centimeter (1 cm³). The milliliter is part of the International System of Units (SI) and is the global standard for liquid measurement in science, medicine, and most countries worldwide. One liter equals 1,000 milliliters, and the milliliter provides a convenient scale for everyday liquid volumes — from medicine doses to cooking ingredients to beverage servings.
The relationship between these units is straightforward: 1 US fluid ounce = 29.5735 milliliters, or conversely, 1 milliliter = 0.033814 fluid ounces. Understanding this conversion is essential for following international recipes, measuring medication accurately, mixing beverages and cocktails, and communicating volumes across measurement systems. It is crucial to note that a fluid ounce measures volume, not weight — one fluid ounce of water weighs approximately 1.04 ounces due to water's density, but this weight varies for other liquids.
The formula to convert fluid ounces to milliliters is: Milliliters = Fluid Ounces × 29.5735. Simply multiply the number of fluid ounces by the conversion factor 29.5735 to get the equivalent volume in milliliters.
Question: A cough syrup dosage is 2 fluid ounces. How many milliliters is that?
Question: A standard coffee cup holds 8 fluid ounces. Convert to milliliters.
Note: 8 fl oz equals exactly 1 US cup, a common recipe measurement.
Question: A standard water bottle contains 16.9 fluid ounces. How many milliliters?
Water bottle manufacturers use 16.9 fl oz because it equals almost exactly 500 mL (half a liter).
For a quick estimate, multiply fluid ounces by 30. This gives you a result within 1.5% accuracy, perfectly fine for cooking and everyday use. For example: 8 fl oz × 30 = 240 mL (exact: 236.588 mL). Another useful shortcut: remember that 1 fl oz ≈ 30 mL, 8 fl oz ≈ 240 mL (1 cup), and 16 fl oz ≈ 480 mL (1 pint). These approximations work well for quick mental calculations when precision is not critical.
| Recipe Measurement | Fluid Ounces | Milliliters |
|---|---|---|
| 1 tablespoon | 0.5 | 14.79 |
| 1/4 cup | 2 | 59.15 |
| 1/3 cup | 2.67 | 78.86 |
| 1/2 cup | 4 | 118.29 |
| 2/3 cup | 5.33 | 157.73 |
| 3/4 cup | 6 | 177.44 |
| 1 cup | 8 | 236.59 |
| 1 pint (2 cups) | 16 | 473.18 |
| Beverage Type | Fluid Ounces | Milliliters |
|---|---|---|
| Espresso shot | 1 | 29.57 |
| Wine glass (standard) | 5 | 147.87 |
| Beer can/bottle | 12 | 354.88 |
| Coffee (small) | 12 | 354.88 |
| Pint glass (US) | 16 | 473.18 |
| Starbucks Grande | 16 | 473.18 |
| Water bottle (standard) | 16.9 | 500.00 |
| Starbucks Venti (cold) | 24 | 709.76 |
| Large fountain drink | 32 | 946.35 |
| Application | Fluid Ounces | Milliliters |
|---|---|---|
| Medicine dropper | 0.034 | 1.0 |
| Teaspoon dose | 0.17 | 5.0 |
| Tablespoon dose | 0.5 | 14.79 |
| Medicine cup (1 oz) | 1 | 29.57 |
| Medicine cup (2 oz) | 2 | 59.15 |
| Liquid medicine bottle | 4 | 118.29 |
| IV bag (small) | 33.8 | 1000 |
Recipes from around the world use different measurement systems. Converting fluid ounces to milliliters allows you to follow European, Asian, and other international recipes with precision. Baking especially requires accurate liquid measurements for successful results.
Healthcare worldwide uses milliliters as the standard for liquid medication dosing. Understanding fl oz to mL conversion ensures accurate medication administration, prevents dosing errors, and helps patients follow prescription instructions correctly, especially when traveling internationally.
Professional cocktail recipes and bartending guides use both fluid ounces (common in the US) and milliliters (international standard). Accurate conversion ensures consistent drink quality, proper alcohol ratios, and the ability to replicate recipes from different bar manuals worldwide.
Science universally uses the metric system, with milliliters as the standard liquid volume unit. Researchers and lab technicians must convert fluid ounces to milliliters when sourcing materials from US suppliers or translating procedures between measurement systems.
The exact factor is 29.5735. For cooking, 30 works fine. For medicine or science, always use the precise factor.
US fl oz = 29.5735 mL, UK fl oz = 28.4131 mL. Always check which system the recipe author uses, especially for British cookbooks.
Memorize key values: 1 fl oz ≈ 30 mL, 8 fl oz ≈ 240 mL (1 cup), 16 fl oz ≈ 480 mL (1 pint), 32 fl oz ≈ 950 mL (1 quart).
Fluid ounces measure volume; ounces measure weight. They are completely different and cannot be converted without knowing density.
If a recipe just says "ounces" without "fl" or "fluid," it likely means weight, not volume. Context matters.
When converting multiple ingredients, keep full precision until the final result to avoid compounding rounding errors.
One US fluid ounce equals exactly 29.5735 milliliters. This is the standard conversion factor used worldwide. To convert any number of fluid ounces to milliliters, simply multiply by 29.5735. For example, 8 fl oz equals 236.588 mL.
No, they are completely different measurements. A fluid ounce (fl oz) measures volume of liquids, while an ounce (oz) measures weight or mass. One fluid ounce of water weighs approximately 1.04 ounces due to water's density. You cannot convert directly between them without knowing the substance's density.
No, they differ slightly. A US fluid ounce equals 29.5735 milliliters, while a UK (Imperial) fluid ounce equals 28.4131 milliliters. The US fluid ounce is about 4% larger. Always verify which system is being used when working with international recipes or measurements.
A standard single-serve water bottle in the US typically contains 16.9 fluid ounces (500 mL) or 20 fluid ounces (591 mL). Larger bottles may be 33.8 fl oz (1 liter) or 50.7 fl oz (1.5 liters). Bottle sizes vary by brand and market.
American recipes traditionally use fluid ounces and cups (part of the US customary system), while international recipes use milliliters and liters (metric system). Many modern cookbooks provide both measurements to accommodate readers worldwide. Milliliters offer more precision for baking and scientific cooking.
For quick estimates, multiply fluid ounces by 30. This gives you a result within 1.5% accuracy. For example, 8 fl oz × 30 ≈ 240 mL (exact: 236.588 mL). Another shortcut: remember that 1 fl oz is roughly 30 mL, 8 fl oz is about 240 mL (1 cup), and 16 fl oz is approximately 480 mL (1 pint).
Common beverage conversions: 8 fl oz (coffee cup) = 237 mL; 12 fl oz (soda can) = 355 mL; 16 fl oz (pint) = 473 mL; 20 fl oz (large coffee) = 591 mL; 32 fl oz (quart) = 946 mL; 64 fl oz (half gallon) = 1893 mL. These are standard US fluid ounce measurements.
Yes, medication dosing requires precise conversions. Medical dosing typically uses milliliters because the metric system offers better precision and is the international standard. Always use the exact conversion factor (29.5735) for medications, never rounded estimates. When in doubt, consult your pharmacist or healthcare provider.
The conversion is exact by definition. One US fluid ounce is legally defined as exactly 29.5735295625 milliliters. The factor 29.5735 is rounded to four decimal places, which provides accuracy to within 0.00001%, more than sufficient for all practical purposes including cooking, laboratory work, and medical applications.
This calculator uses the internationally recognized conversion factor of 1 US fluid ounce = 29.5735295625 milliliters. For medical dosing, pharmaceutical applications, and scientific research, always verify conversions with appropriate professional guidance. When following recipes, verify whether US or UK fluid ounces are specified.