About

One cubic centimeter (cc or cm³) equals exactly 0.001 L by SI definition. This identity is not an approximation. The liter was redefined in 1964 (CGPM Resolution 6) as exactly 1 dm³ = 1000 cm³. Before that redefinition the liter had a slightly different value tied to the mass of water at 3.98°C, which caused errors of roughly 28 ppm in volumetric chemistry. Confusing cc with mL is safe post-1964, but mixing up cc and L by a factor of 1000 can be dangerous in pharmacology (drug overdose) or costly in engine displacement specs (warranty claims). This converter applies the exact factor with no rounding drift.

Formulas

The conversion between cubic centimeters and liters uses the exact SI relationship established by the 12th CGPM in 1964:

V_L = V_cc × 0.001

The inverse conversion:

V_cc = V_L × 1000

Equivalently expressed as a fraction:

V_L = V_cc1000

Where V_L = volume in liters, V_cc = volume in cubic centimeters. The factor 1000 is exact: 1 L ≡ 1 dm³ ≡ 1000 cm³. No rounding error exists in this conversion. Note that 1 cc = 1 mL exactly under the current SI system.

Reference Data

Context	Value (cc)	Value (L)	Notes
Insulin syringe	1	0.001	Standard U-100 syringe
Medical syringe (small)	3	0.003	Common for injections
Medical syringe (standard)	5	0.005	Blood draw syringe
Teaspoon (metric)	5	0.005	Cooking measure
Tablespoon (metric)	15	0.015	Cooking measure
Medical syringe (large)	50	0.05	Irrigation / feeding
Espresso shot	30	0.03	Single shot
Moped engine	50	0.05	Typical moped / scooter
Drinking cup (metric)	250	0.25	Standard metric cup
Motorcycle (small)	125	0.125	Learner bikes
Motorcycle (mid)	600	0.6	Sport bikes
Water bottle	500	0.5	Standard bottle
Wine bottle	750	0.75	Standard 750 mL
Motorcycle (large)	1000	1.0	Liter-class superbike
Compact car engine	1200	1.2	City cars (e.g., VW Polo)
Sedan engine (small)	1600	1.6	e.g., Honda Civic base
Sedan engine (mid)	2000	2.0	e.g., Toyota Camry
SUV engine	2500	2.5	Mid-size SUVs
V6 engine	3500	3.5	e.g., Ford Explorer
V8 muscle car	5000	5.0	e.g., Ford Mustang GT
V8 truck engine	5700	5.7	e.g., RAM 1500 HEMI
Large V8	6200	6.2	e.g., Chevrolet Corvette
Heavy-duty diesel	6700	6.7	e.g., Cummins turbo diesel
Marine outboard (large)	4200	4.2	Mercury V6 outboard
Blood volume (adult)	5000	5.0	Average adult human
Hot tub (small)	750000	750	2-person spa

Frequently Asked Questions

Yes. Since the 1964 redefinition by the 12th CGPM, 1 cc (cm³) = 1 mL exactly. Before 1964, the liter was defined by the mass of water at 3.98°C, which made 1 L ≈ 1000.028 cm³. That 28 ppm discrepancy is eliminated under the current definition.

Regulatory and tax traditions vary by country. Japan and India tax motorcycles and cars by cc displacement brackets (e.g., under 125 cc, under 600 cc). European and American markets tend to market the same engines in liters (e.g., 2.0 L turbo). The underlying measurement is identical: a 2000 cc engine is a 2.0 L engine.

For practical purposes, no. The conversion factor is exactly 1000, a power of 10. However, JavaScript uses IEEE 754 double-precision floats, so certain decimal inputs like 0.1 cc may produce 0.00010000000000000000818 L internally. This converter rounds the display to the user-selected decimal precision to eliminate visible drift.

They are numerically identical under current SI definitions. However, medical standards (USP, ISO 7886) prefer mL on syringe markings to avoid confusion with other abbreviations. The abbreviation cc can be misread as "00" in handwritten prescriptions, which is why the ISMP (Institute for Safe Medication Practices) lists cc on its "Do Not Use" abbreviation list. Always verify units when converting dosage volumes.

It does not. The conversion 1 L = 1000 cc is a geometric relationship between units of length cubed. Temperature and pressure affect the density of a substance occupying that volume (e.g., air at altitude is less dense), but the volume units themselves remain invariant. A 500 cc container holds 0.5 L regardless of conditions.

Medical dosing typically requires 2 - 3 decimal places in mL (equivalent to cc). Engine displacement specs are usually rounded to whole cc values or one decimal in liters. For laboratory volumetric analysis (e.g., titrations), 4 - 5 significant figures may be needed. This converter supports up to 8 decimal places.