Article — mL to CC Converter (Milliliters to Cubic Centimeters)
mL to cc converter: milliliters to cubic centimeters in clinical use
One milliliter equals exactly one cubic centimeter. The relationship is defined, not measured — locked in by the 1964 redefinition of the liter as exactly one cubic decimeter. The conversion factor is 1, so the numeric value does not change between mL and cc. The only thing that changes is which label is appropriate for which audience.
This page approaches the conversion from the mL side because that is the modern clinical and laboratory default. Pharmacy, nursing, vaccine documentation, IV therapy, and laboratory chemistry all use mL. The cc label survives on older syringes, in automotive engine specifications, and in legacy medical training, but mL is the unit you will see on a modern prescription, a digital infusion pump, or a volumetric flask.
The mL to cc rule
The rule is exact and easy to memorize: 1 mL = 1 cc. The factor is 1 in both directions, so no arithmetic is required. The number you enter is the number you get out; only the unit label changes. A 5 mL pediatric dose, a 5 cc legacy syringe marking, and a 5 cm³ academic citation all describe the same volume.
The identity comes from how the metric system defines volume. A liter is exactly one cubic decimeter (10 cm × 10 cm × 10 cm = 1000 cm³). Divide by 1000 and you get a milliliter, which equals one cubic centimeter by construction. There is no measurement uncertainty in the relationship.
What is a milliliter?
A milliliter is one thousandth of a liter, written as mL or millilitre. It is the volume of a 1 cm × 1 cm × 1 cm cube of liquid, the dose in a typical eyedropper, or one fifth of a teaspoon. The unit became the SI-preferred name for this volume after the 1960 establishment of the SI system, because it ties cleanly to the liter rather than to a cubic length.
In clinical practice, mL is now the universal unit for liquid medication, intravenous therapy, and laboratory measurement. Modern syringes show mL prominently; volumetric glassware is calibrated in mL; infusion pumps display mL/hr. The legacy cc label still appears on older equipment, but new training and new equipment use mL exclusively.
What is a cubic centimeter?
A cubic centimeter is the volume of a cube one centimeter on each side, written as cc, cm³, or occasionally ccm. It is identical to a milliliter in every respect except the spelling. The cc label predates the milliliter as a popular term, having been adopted by 19th-century engineering and medical practice. By the time the SI system formally established mL as the preferred volume name in 1960, cc was already entrenched on millions of syringes and engine specifications.
The pre-1964 definition of the liter was the volume of one kilogram of pure water at 4°C and 1 atmosphere pressure. This made mL and cc very nearly — but not exactly — equal, because the density of water is slightly less than 1 g/cm³ at 4°C. The 1964 redefinition adopted the cubic decimeter exactly, eliminating the tiny 28 parts per million discrepancy and making mL = cc a true mathematical identity for the first time.
The mL to cc formula
The conversion is trivial in both directions:
mL × 1 = cccc × 1 = mL1,000 mL = 1 L1 mL = 0.0338 fl oz (US)There is no factor to memorize, no decimal shift, no rounding. The calculator above exists primarily to confirm that the equivalence is exact and to let users switch the unit label without doing any math themselves.
mL in pharmacy and prescription
The Institute for Safe Medication Practices (ISMP) and the Joint Commission both recommend mL as the only acceptable volume abbreviation in written prescriptions. The reason is patient safety: handwritten "cc" can be misread as "00", leading to dosing errors of a hundred or more times the intended amount. A "5 cc" order misread as "500" could be fatal.
Spoken communication is more relaxed: nurses still say "5 cc of saline" in surgical settings, and the meaning is unambiguous. The recommendation against cc applies specifically to handwriting and printed prescription orders, not to verbal handoffs or equipment labels.
ISMP's list of error-prone abbreviations places "cc" in the "do not use" category for written and electronic prescriptions. The Joint Commission accreditation standards require US hospitals to ban cc from clinical documentation. Verbal use is fine; written use of cc is not. When in doubt, default to mL.
mL in the laboratory
Analytical chemistry and biology labs use mL as the universal volume unit. Pipettes are calibrated in mL or μL (microliters, one thousandth of a mL). Beakers, flasks, graduated cylinders, and centrifuge tubes all display mL graduations. Modern textbooks have used mL exclusively since at least the 1980s.
The cubic centimeter notation still appears in two niches: as cm³ in physics and engineering writing where unit derivation matters (because cm³ shows the length-cubed structure), and as cc in older lab manuals and on legacy glassware. Both are correct and equivalent to mL.
For volumes below 1 mL, switch to microliters (μL). 1 mL = 1,000 μL. Pipette tips for molecular biology often handle 0.1 to 10 μL, far below the resolution of a clinical syringe. The same SI prefix logic that gives you cm vs m gives you μL vs mL.
mL to cc conversion table
The volumes people search for most often, with clinical and everyday context.
- 0.5 mL = 0.5 cc (standard vaccine dose)
- 1 mL = 1 cc (insulin syringe, IM injection)
- 5 mL = 5 cc (pediatric syrup, 1 teaspoon)
- 10 mL = 10 cc (vaccine vial, blood draw)
- 15 mL = 15 cc (adult cough syrup, 1 tablespoon)
- 30 mL = 30 cc (1 US fluid ounce, shot glass)
- 100 mL = 100 cc (small IV bag, sample bottle)
- 250 mL = 250 cc (one cup, plasma minibag)
- 500 mL = 500 cc (half-liter IV, blood unit)
- 1,000 mL = 1,000 cc = 1 L (standard IV bag)
Common mL-to-cc mistakes
Looking for a conversion factor. There is no factor. 1 mL = 1 cc by SI definition. If your calculator changes the number, something is wrong.
Confusing mL with mg. Milliliters measure volume; milligrams measure mass. 5 mL of water weighs about 5 g (5,000 mg), but 5 mL of mercury weighs 67 g. Volume and mass conversions depend on density and are not interchangeable.
Writing cc in a prescription. US hospital accreditation forbids it. Use mL on all written orders.
Treating mL and fluid ounce as equal. 1 mL is not 1 fl oz. 1 US fl oz is 29.5735 mL; 1 UK fl oz is 28.41 mL. The cc-mL equivalence is exact, but the mL-fl oz conversion has a real factor.