Cubic Centimeters to Ounces: Convert cc to oz
One cubic centimeter (cc) equals 0.0338 US fluid ounces, so 30 cc is just over 1 fl oz. A cc is exactly the same volume as a milliliter, which is why syringes, medicine cups and engine oil bottles can carry either label. This cc to ounces converter gives US and UK fluid ounces, and ounces by weight for common liquids.
How to Convert CC to Ounces
A cubic centimeter is exactly one milliliter, and a US fluid ounce is exactly 29.5735 milliliters. So the cc to oz conversion is a single division:
US fluid ounces = cc / 29.5735 (or cc x 0.033814)
UK fluid ounces = cc / 28.4131 (or cc x 0.035195)
Worked example: a 60 cc syringe holds 60 ÷ 29.5735 = 2.03 US fluid ounces, or 60 ÷ 28.4131 = 2.11 UK fluid ounces. For a quick mental estimate, use 30 cc per fluid ounce: the answer comes out about 1.4% low, which is close enough for anything but precise measuring.
Fluid Ounces vs. Ounces by Weight
"Ounce" can mean two different things. A fluid ounce measures how much space a liquid takes up, so it converts from cc with one fixed number. An ounce by weight measures how heavy something is, so the answer depends on the liquid's density:
ounces (weight) = cc x density (g/mL) / 28.3495
The same 100 cc gives very different weights depending on what fills it:
| 100 cc of | Density | Weight |
|---|---|---|
| Vegetable oil | 0.92 g/mL | 3.25 oz |
| Water | 1.0 g/mL | 3.53 oz |
| Milk | 1.03 g/mL | 3.63 oz |
| Honey | 1.42 g/mL | 5.01 oz |
Every one of those is 3.38 fluid ounces. Only the weight changes. The calculator uses the density values listed on our methodology page; choose "Ounces by weight" and pick your liquid to get the weight instead of the volume.
CC to Oz Conversion Chart
Common amounts in ccs to oz, with both fluid ounce systems and the weight of the same volume of water:
| CC | US fl oz | UK fl oz | Water (oz by weight) |
|---|---|---|---|
| 1 cc | 0.0338 | 0.0352 | 0.0353 |
| 2 cc | 0.0676 | 0.0704 | 0.0705 |
| 3 cc | 0.1014 | 0.1056 | 0.1058 |
| 5 cc | 0.1691 | 0.1760 | 0.1764 |
| 10 cc | 0.3381 | 0.3520 | 0.3527 |
| 15 cc | 0.5072 | 0.5279 | 0.5291 |
| 20 cc | 0.6763 | 0.7039 | 0.7055 |
| 30 cc | 1.0144 | 1.0559 | 1.0582 |
| 50 cc | 1.6907 | 1.7598 | 1.7637 |
| 60 cc | 2.0288 | 2.1117 | 2.1164 |
| 100 cc | 3.3814 | 3.5195 | 3.5274 |
| 120 cc | 4.0577 | 4.2234 | 4.2329 |
| 150 cc | 5.0721 | 5.2793 | 5.2911 |
| 250 cc | 8.4535 | 8.7988 | 8.8185 |
| 500 cc | 16.907 | 17.598 | 17.637 |
| 1,000 cc | 33.814 | 35.195 | 35.274 |
Common CC Sizes in Ounces
People rarely search for cubic centimeters in the abstract. They see "cc" printed on something. These are the places it turns up most.
Syringes and Medicine Cups
Syringes are the most common place to convert ccs to ounces, because their barrels are marked in cc or mL while home measuring cups use ounces:
| Syringe size | US fl oz | Metric teaspoons (5 mL) |
|---|---|---|
| 1 cc | 0.034 | 0.2 |
| 3 cc | 0.10 | 0.6 |
| 5 cc | 0.17 | 1 |
| 10 cc | 0.34 | 2 |
| 20 cc | 0.68 | 4 |
| 60 cc | 2.03 | 12 |
A standard plastic medicine cup holds 30 cc, just over 1 fluid ounce. For any medicine, measure with the device that came with it and follow the dose on the label or prescription; this table is for understanding the units, not for dosing. You will also see "cc" being replaced by "mL" on newer labels, because medication-safety groups such as the Institute for Safe Medication Practices list "cc" as an error-prone abbreviation that can be misread as "u" (units) when handwritten.
Two-Stroke Engine Oil Mix
Chainsaws, string trimmers, leaf blowers and outboard motors with two-stroke engines run on fuel mixed with oil at a set ratio. Oil bottles are often marked in both cc and ounces. For one US gallon of fuel (3,785 cc):
| Mix ratio | Oil per US gallon (cc) | Oil per US gallon (fl oz) | Oil per liter (cc) |
|---|---|---|---|
| 50:1 | 75.7 cc | 2.56 fl oz | 20 cc |
| 40:1 | 94.6 cc | 3.2 fl oz | 25 cc |
| 32:1 | 118.3 cc | 4 fl oz | 31.3 cc |
| 25:1 | 151.4 cc | 5.12 fl oz | 40 cc |
Use the ratio your engine's manual specifies. Running too little oil can damage a two-stroke engine, so when in doubt, check the manual rather than guessing.
Perfume and Travel Bottles
Cosmetic and perfume bottles are sized in round metric amounts, and the ounce figure printed beside it is rounded:
| Bottle size | Exact US fl oz | Usually printed as |
|---|---|---|
| 15 cc | 0.507 | 0.5 fl oz |
| 30 cc | 1.014 | 1 fl oz |
| 50 cc | 1.691 | 1.7 fl oz |
| 75 cc | 2.536 | 2.5 fl oz |
| 100 cc | 3.381 | 3.4 fl oz |
That 100 cc size is the reason "3.4 ounces" is the familiar travel-bottle limit: it is simply 100 mL rounded to one decimal place.
US vs. UK Fluid Ounces
The two fluid ounces are not the same size. A US fluid ounce is 29.5735 cc, and a UK (imperial) fluid ounce is 28.4131 cc, so the UK ounce is about 4% smaller. That means the same volume converts to a slightly larger number of UK ounces: 100 cc is 3.38 US fl oz but 3.52 UK fl oz.
The difference rarely matters for a few cc, but it adds up over larger amounts and in older British recipes. Confusingly, the UK pint is larger than the US pint even though its ounce is smaller, because a UK pint holds 20 fluid ounces against the US pint's 16.
Common Questions
How many cc are in an ounce?
There are 29.57 cc in a US fluid ounce and 28.41 cc in a UK fluid ounce. If you mean an ounce by weight of water, that is 28.35 cc, since water weighs 1 gram per cc.
Is 1 cc the same as 1 mL?
Yes, exactly. A milliliter is defined as one cubic centimeter, so the two are interchangeable on any label. Medicine and engines tend to say cc, while food and drink labels say mL.
How many ounces is 100 cc?
100 cc is 3.38 US fluid ounces or 3.52 UK fluid ounces. If the 100 cc is water, it weighs 3.53 ounces.
How many cc is a tablespoon?
A US tablespoon is 14.79 cc, usually rounded to 15. A metric tablespoon is exactly 15 cc. Either way, two tablespoons make roughly one fluid ounce.
Can I convert engine cc to ounces?
You can, but it is rarely useful. Engine cc measures how much air and fuel the cylinders sweep through, not a liquid you pour. A 250 cc engine displaces 8.45 US fluid ounces of volume, but engines are normally compared in cc, liters, or cubic inches (1 cubic inch = 16.387 cc, so 250 cc is about 15.3 cubic inches).
Unit definitions follow the exact values published by the U.S. National Institute of Standards and Technology (NIST). Weight results use the site's standard densities, with water at 1.0 g/mL. Written by Shah Nasar. Last updated October 2026.