Cubic Centimeters to Milliliters Converter
Common Conversions
| cm³ | mL |
|---|---|
| 0.1 | 0.1 |
| 0.5 | 0.5 |
| 1 | 1 |
| 5 | 5 |
| 10 | 10 |
| 25 | 25 |
| 50 | 50 |
| 100 | 100 |
| 250 | 250 |
| 500 | 500 |
| 1000 | 1000 |
Why this conversion matters in chemistry
This is the rare conversion where the answer is always identically true: 1 cm³ = 1 mL, exact by definition since the milliliter was pinned to the cubic centimeter in 1964. The only reason to document it at all is that two unit traditions coexist — mL from the volume-based metric system (liter-derived), cm³ from the length-based one (1 cm cubed). You'll see cm³ in density reports (g/cm³), crystal-structure volumes, and molecular-volume calculations, and mL almost everywhere else in wet chemistry. Knowing they're interchangeable lets you read across references without doing any arithmetic at all.
Formula
Where the factor comes from
Two units built from different starting points, made to coincide by decree. The cubic centimeter comes from length: a centimeter cubed, fixed by the SI prefix. The milliliter comes from volume: a thousandth of a liter. They meet because the 1964 redefinition set the liter equal to exactly one cubic decimeter, which is exactly 1000 cm³, making a thousandth of a liter exactly 1 cm³. The identity is therefore a definition, not a happy accident, and it holds to every digit. Before 1964 it did not hold at all. From 1901 the liter was the volume occupied by one kilogram of water at its density maximum, which later measurement placed at 1.000028 dm³ — so a pre-1964 milliliter exceeded a cubic centimeter by about 28 parts per million.
Precision and significant figures
No arithmetic happens, so nothing rounds and no figure is gained or lost. 12.47 cm³ is 12.47 mL, digit for digit, and any apparent change of precision on this pair is a transcription error rather than a conversion effect. That leaves the delivery device as the only source of uncertainty worth discussing. An air-displacement pipette near the top of its nominal range typically holds a few tenths of a percent; the same pipette near the bottom of its range is markedly worse, which is the argument for reaching past it to the smaller one. A cylinder read at the meniscus rarely justifies more than three figures. The 28 ppm historical offset sits far beneath all of it.
Worked Examples
The defining equivalence. Same volume, different unit convention.
A mole of ideal gas at old STP — easier to read as 22.414 L, but the digits land the same in cm³ and mL.
A standard volumetric flask volume. Whether the label reads cm³ or mL depends on the manufacturer's convention.
A small syringe or microliter-scale liquid delivery. Medical usage often labels this 0.5 cc.
Common mistakes
Treating cc as an approximation
Cubic centimeter, cm³ and cc name one unit exactly. The cc spelling is an older typographic convenience from before superscripts were easy to set, and some readers take the informal look as a signal that the figure is rough. It is not. A volume written 5 cc carries whatever precision its measurement had, and rewriting it as 5 mL changes the notation and nothing else.
Assuming grams and milliliters interchange
The cm³-to-mL identity is exact, but stepping from volume to mass is not a unit conversion at all. It requires a density, and only water comes near making 1 mL weigh 1 g: 0.99997 g at its density maximum around 4 °C, 0.997 g by 25 °C. A milliliter of dichloromethane is about 1.33 g and a milliliter of hexane about 0.65 g. The convenient coincidence belongs to one substance.
The unit changes; the uncertainty does not
A vessel marked 50 mL and one marked 50 cm³ hold the same nominal volume, and neither label is a measurement. Molded beaker and flask graduations can be off by several percent, and relabeling the number in the other unit preserves that error exactly. A volume you intend to trust comes from a pipette, burette or volumetric flask, whichever unit happens to be printed on the glass.