Ounces to
Milliliters Converter
Convert fluid ounces to millilitres (and back) instantly — US and UK fluid ounces, fraction display, and full kitchen unit equivalents for cooking, baking, and drinks.
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Ounces to Milliliters Converter: Convert fl oz to mL Instantly
Whether you’re following a European recipe that calls for 200 mL of cream, checking how much water to drink from your 24 fl oz bottle, or measuring medicine that’s listed in mL but your measuring cup shows ounces — this free ounces to milliliters converter gives you instant, accurate conversions with simultaneous multi-unit output. It supports both US and UK fluid ounces, since these are not the same value.
💧 Key formulas:
US fl oz → mL: multiply by 29.5735
UK fl oz → mL: multiply by 28.4131
mL → US fl oz: divide by 29.5735
mL → UK fl oz: divide by 28.4131
Quick approximation: 1 fl oz ≈ 30 mL (US) — close enough for cooking, not for medicine.
Fluid Ounces to mL Reference Table
| Fluid Ounces | US mL | UK mL | US Cups | Tablespoons |
|---|---|---|---|---|
| ½ fl oz | 14.79 mL | 14.21 mL | ⅟₁₆ cup | 1 tbsp |
| 1 fl oz | 29.57 mL | 28.41 mL | ⅛ cup | 2 tbsp |
| 2 fl oz | 59.15 mL | 56.83 mL | ¼ cup | 4 tbsp |
| 4 fl oz | 118.29 mL | 113.65 mL | ½ cup | 8 tbsp |
| 8 fl oz | 236.59 mL | 227.30 mL | 1 cup | 16 tbsp |
| 16 fl oz | 473.18 mL | 454.61 mL | 2 cups | 32 tbsp |
| 32 fl oz | 946.35 mL | 909.22 mL | 4 cups (1 qt) | 64 tbsp |
| 128 fl oz | 3,785 mL | 3,637 mL | 16 cups (1 gal) | 256 tbsp |
US vs UK Fluid Ounces
One of the most common sources of measurement confusion is the fact that US and UK fluid ounces have different values. A US fluid ounce = 29.5735 mL. A UK/Imperial fluid ounce = 28.4131 mL — about 4% smaller. While this difference seems minor, it adds up: 8 UK fl oz = 227 mL, while 8 US fl oz = 237 mL — a 10 mL difference per cup.
Why mL are used globally
Millilitres are part of the International System of Units (SI) and are used in virtually every country outside the US for cooking, medicine, and science. European, Asian, and Australian recipes almost always specify volumes in mL or litres. Medical dosages worldwide are in mL. This converter bridges the gap for US-based users following international recipes.
Medicine and mL
Medical and pharmaceutical dosing uses mL exclusively worldwide. “Take 5 mL” means the same in every country. If your measuring spoon says fluid ounces, 5 mL = approximately 0.169 US fl oz — use this converter for precise medical measurements, and always verify with your pharmacist.
Beverages and serving sizes
Coffee shop sizes (espresso shots = 1 fl oz / 30 mL), wine servings (5 fl oz / 148 mL), spirits (1.5 fl oz / 44 mL), and beer can sizes (12 fl oz / 355 mL) are all common conversions. This converter handles all beverage measurement needs instantly.
Scientific precision
For laboratory work, chemical mixing, or skincare formulation, exact mL values matter. The US fl oz = 29.5735295625 mL exactly (defined by SI). When precision is critical, use the full decimal value rather than the 29.57 approximation.
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