Ounces to Milliliters Converter

About the Ounces to Milliliters Converter

Fluid ounces and milliliters are common small-volume units in cooking, beverage labeling, and pharmacy. The US fluid ounce equals 29.5735295625 mL, while the imperial fluid ounce equals 28.4131 mL, so the result depends on which ounce standard you are using.

This converter handles both directions and shows cups, liters, tablespoons, teaspoons, pints, and gallons alongside the main value. That is useful when a recipe, label, or batch sheet starts in fluid ounces but needs to be checked in milliliters.

Use it when you need a clean ounce-to-milliliter answer with the related kitchen units still visible. It is also helpful for comparing drink sizes, bottle labels, and dosing instructions where the original number is written in ounces but the measuring tool or packaging standard in front of you is metric. The side-by-side display is especially useful when US and imperial ounce standards might otherwise be confused. It also saves time when the same label or recipe has to be checked in both kitchen and packaging units.

When This Page Helps

The ounce-to-milliliter conversion is simple only if you already know which ounce standard applies. This page makes that choice explicit and gives the downstream cup, tablespoon, and liter values people usually need next when they are converting recipes, beverage sizes, or liquid labels. That reduces the chance of using the right number with the wrong measuring system.

How to Use the Inputs

1. Select the direction: fluid ounces → mL or mL → fluid ounces.
2. Enter a volume or click a preset for common container sizes.
3. Choose decimal precision.
4. Read the result plus seven additional volume units.
5. Check the visual fill bar showing the volume relative to 1 liter.
6. Consult the reference table for common container equivalents.
7. Use batch mode to convert lists of volumes.

Example Calculation

Tips & Best Practices

• Quick estimate: 30 mL ≈ 1 fl oz. Exact: 29.5735 mL.
• For recipes, 1 cup = 8 fl oz = 237 mL. Round to 240 mL for metric recipes.
• A standard wine bottle is 750 mL = 25.36 fl oz.
• Cocktail jiggers are typically 1 oz (30 mL) and 1.5 oz (44 mL).
• When doubling a recipe, convert to mL first — metric measurements scale more cleanly.

US vs Imperial Fluid Ounces

The US fluid ounce (29.5735 mL) and Imperial fluid ounce (28.4131 mL) differ by about 4%. This matters for precision in baking, cocktail mixing, and pharmaceutical dosing. Always confirm which system a recipe uses before converting. US grocery products labeled in fl oz use the US measure; UK products use the Imperial measure.

Volume Measurements in Cooking

| Measure | US fl oz | mL | |---|---|---| | 1 teaspoon | 0.167 | 4.93 | | 1 tablespoon | 0.5 | 14.79 | | ¼ cup | 2 | 59.15 | | ⅓ cup | 2.67 | 78.86 | | ½ cup | 4 | 118.29 | | 1 cup | 8 | 236.59 | | 1 pint | 16 | 473.18 | | 1 quart | 32 | 946.35 | | 1 gallon | 128 | 3,785.41 |

Pharmacy and Dosing

Liquid medications are dosed in mL worldwide, but many US patients still measure with kitchen spoons (1 tsp ≈ 5 mL). Oral syringes marked in mL are more accurate. This converter can verify prescribed volumes against household measures.

Frequently Asked Questions

• How many mL in 1 fluid ounce?

  29.5735 mL in 1 US fluid ounce. The Imperial (UK) fluid ounce is slightly smaller at 28.4131 mL.

• How many fl oz in a liter?

  33.814 US fl oz per liter, or 35.195 Imperial fl oz per liter.

• Is a "cup" 8 fl oz?

  In US measurement, yes — 1 US cup = 8 US fl oz = 236.59 mL. A metric cup is 250 mL. An Imperial cup is 284.13 mL.

• Why is this different from weight ounces?

  Fluid ounces measure volume, weight ounces (avoirdupois) measure mass. They are not interchangeable unless you know the density of the liquid.

• How do I convert for UK recipes?

  UK recipes typically use imperial measurements. 1 imperial fl oz = 28.413 mL. If the source is British and does not say otherwise, imperial is usually the safer assumption.

• How many tablespoons in a fluid ounce?

  2 tablespoons = 1 fl oz (US). So 1 tablespoon = about 14.79 mL.