How many cc are in a fluid ounce?

One US fluid ounce equals exactly 29.5735295625 cc (cubic centimetres, which are the same as millilitres). One UK imperial fluid ounce equals exactly 28.4130625 cc. Because the two systems differ by about 4 percent, it matters which ounce you are using. In everyday cooking, the difference is usually small enough to ignore, but in medical and scientific contexts you should always confirm which standard applies.

Is cc the same as mL?

Yes. One cubic centimetre (1 cc) is exactly equal to one millilitre (1 mL). Both describe the same volume: a cube with sides of one centimetre. The term cc is commonly used in medicine (for example, 5 cc syringe) and engineering, while mL is more common in everyday cooking and chemistry. You can use either label interchangeably in this converter.

How do I convert oz back to cc?

To convert US fluid ounces to cc, multiply the number of ounces by 29.5735295625. For example, 8 US fl oz equals 8 x 29.5735 = 236.59 cc (approximately 237 mL, which is close to a standard cup). To convert UK imperial fluid ounces to cc, multiply by 28.4130625. This converter includes a reverse-direction field so you can enter ounces and instantly read back the cc equivalent.

CC to Oz Converter

This converter changes cubic centimetres (cc) into fluid ounces and back again, so you can move between metric and imperial volume measurements without doing the maths yourself. Because one cc is exactly the same as one millilitre (mL), it is the tool to reach for whenever a medicine dose, recipe, syringe size or bottle label is given in cc and you need it in ounces, or the other way round. Start by choosing whether you want US fluid ounces (29.5735 mL each) or UK imperial fluid ounces (28.4130 mL each), since the two differ by about 4 percent and using the wrong one can matter for dosing or scientific work. Enter a volume in cc to see the equivalent in fluid ounces and litres, or enter fluid ounces to have the cc and litre figures calculated in reverse. Quick presets cover common volumes such as a teaspoon, tablespoon, standard can and 1 litre bottle, and a reference table below the calculator lists conversions for a range of everyday volumes in both ounce systems at once. With the default 100 cc, the calculator returns 3.3814 US fluid ounces (or 3.5195 UK fluid ounces) and 0.1000 litres. Because the conversion factors are fixed international standards, the results are exact rather than approximate, though for medical dosing you should always follow the unit stated on the prescription or packaging.

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Standard conversion Based on exact SI and NIST definitions: 1 US fl oz = 29.5735295625 mL; 1 UK fl oz = 28.4130625 mL.

1. Enter Volume

Ounce type

Cubic centimetres (cc / mL)

Fluid ounces (oz) reverse input

fl oz

2. Quick Presets

Common volume

Worked example (default):
100 cc divided by 29.5735295625 = 3.3814 US fl oz
(or 100 / 28.4130625 = 3.5195 UK fl oz)

Conversion Result

Result in Fluid Oz
3.3814
US fl oz

In cc / mL

100.00

cc (= mL)

In Litres

0.1000

Reference Conversion Table

cc (mL)	US fl oz	UK fl oz	Litres

How to Convert CC to Fluid Ounces

A cubic centimetre (cc) and a millilitre (mL) are exactly the same volume. To convert cc to US fluid ounces, divide by 29.5735295625. To convert to UK imperial fluid ounces, divide by 28.4130625.

Formula	Direction
oz (US) = cc / 29.5735295625	cc to US fl oz
oz (UK) = cc / 28.4130625	cc to UK fl oz
cc = oz (US) x 29.5735295625	US fl oz to cc
cc = oz (UK) x 28.4130625	UK fl oz to cc

US vs UK Fluid Ounces

The two fluid ounce systems are close but not identical. The US fluid ounce is defined as 1/128 of a US gallon, which works out to 29.5735295625 mL. The UK (imperial) fluid ounce is 1/160 of an imperial gallon, equal to 28.4130625 mL. The difference is about 4 percent. For cooking and everyday use the distinction rarely matters, but for pharmaceutical, laboratory, or manufacturing purposes you should confirm which standard applies to your context.

CC to US Fluid Oz: Common Values

cc (mL)	US fl oz	Everyday reference
5 cc	0.169 fl oz	One medicine teaspoon
15 cc	0.507 fl oz	One tablespoon (approx)
29.57 cc	1.000 fl oz	Exactly 1 US fl oz
100 cc	3.381 fl oz	Small bottle
236.6 cc	8.000 fl oz	1 US cup
355 cc	12.00 fl oz	Standard US can
500 cc	16.91 fl oz	500 mL bottle
1000 cc	33.81 fl oz	1 litre

Why CC Is Used in Medicine

In clinical and pharmaceutical settings, volumes are almost always expressed in cubic centimetres (cc) or millilitres (mL) because the metric system integrates cleanly with other scientific measurements. A 5 cc syringe holds exactly 5 mL of liquid. When a doctor writes a dosage in cc, you can convert to fluid ounces using this tool, but be aware that most NZ and international medication instructions use metric units and you should measure in mL rather than ounces to avoid dosing errors.

Related Calculators

Essential Calculators hub: all converter and utility tools.
Ounces to Millilitres Converter: reverse direction, oz to mL.
mL to Grams Calculator: convert volume to mass using density.
Grams to Ounces Calculator: mass conversion for cooking and parcels.
Volume Conversion Calculator: litres, gallons, cups, pints and more.

Sources and method: US fluid ounce definition: NIST Handbook 44, 1 US fl oz = 29.5735295625 mL (exact). UK imperial fluid ounce: Weights and Measures Act 1985, 1 UK fl oz = 28.4130625 mL (exact). 1 cc = 1 mL by definition of the millilitre (SI, BIPM).

This converter provides exact results based on defined conversion factors. For medical dosing, always use the unit stated in the prescription or product instructions and measure with an appropriate measuring device.