Ounces to Milliliters Converter

How to use this calculator

1. Enter a volume in US fluid ounces from a recipe, bottle label, bar pour, or travel container.
2. We multiply that value by 29.5735 to convert to milliliters.
3. Review the result in mL and round or adjust it to match your recipe, packaging, or regulatory needs.
4. Try different fl oz amounts (for example, 1, 2, 8, 12, 16) to quickly see their metric equivalents.

Inputs explained

Fluid ounces

The liquid volume in US fluid ounces (fl oz) that you want to convert. This is a volume measure used on US drink, sauce, and toiletry labels—not a weight measure.

When to use it

• Converting US recipe volumes written in fluid ounces into milliliters so you can measure ingredients with metric kitchen tools.
• Checking travel bottle sizes labeled in fl oz against carry-on liquid limits that are specified in milliliters (for example, 100 mL).
• Bartending or beverage sizing in metric markets, where bar programs and regulations are often written in mL instead of fl oz.
• Translating US product packaging from fl oz to mL when designing labels for international customers or metric jurisdictions.
• Comparing product sizes when one is labeled in fl oz and another in mL to see which offers more liquid.

Tips & cautions

• This converter uses US fluid ounces. UK imperial fl oz use a different factor (1 imp fl oz ≈ 28.4131 mL); if you are working with UK measures, use that factor instead.
• For dry ounces (weight), use a weight converter like ounces-to-grams—volume and weight are only interchangeable when you know the liquid’s density.
• Round to two decimal places for most cooking and bar uses; keep more decimals if you’re working in lab or regulatory contexts that require higher precision.
• When working with very small volumes, you may find it easier to convert to teaspoons or tablespoons; you can use mL to move between those systems.
• If you often convert in both directions, pair this with the mL-to-fl-oz converter to go back and forth quickly.
• Covers US liquid fluid ounces only; it does not automatically handle UK imperial fluid ounces or dry volume measures.
• Displays rounded milliliters for readability; small differences across tools may be due to rounding or slightly different conversion factors.
• Assumes the labeled volume is accurate; manufacturing tolerances and overfills can cause slight real-world differences.

Worked examples

Deep dive

FAQs

Is 1 US fl oz = 29.5735 mL exact?

Yes, 29.5735 mL is the standard defined relationship used for US fluid ounces. Small differences across calculators usually come from rounding approaches.

Can I use this for UK imperial fluid ounces?

This tool assumes US fluid ounces. For UK imperial fluid ounces, multiply by 28.4131 instead; you can mentally swap the factor if needed for UK-specific volumes.

Does this work for dry ingredients?

It works for liquid volumes. For dry ingredients—especially in baking—it’s usually better to convert ounces by weight to grams rather than using volume conversions.

Why doesn’t the mL value exactly match my bottle label?

Manufacturers often round to whole milliliters or use both metric and US customary volumes on labels. This calculator uses the standard factor; small label differences typically reflect rounding or marketing choices.

How many milliliters are in 1 cup?

One US cup equals 8 fl oz, so 8 × 29.5735 ≈ 236.588 mL. You can use this converter to verify that or to convert any other fl oz measure in your recipe.

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