Inch is the China unit of measurement and centimeter is the international unit of measurement.

Because 1 inch =3.33 cm.

So 6 inches = 6x3.33cm =19.98cm. ..

That is, 6 inches is equal to 19.98 cm.

Extended data:

1, international unit of length measurement

(1) The international units of length measurement are micron, millimeter, centimeter, decimeter and meter.

(2) Conversion relationship between units

1 m = 10 decimeter, 1 decimeter = 1 0cm, 1 0mm,1mm = 1000 micron.

1 m = 10 decimeter = 100 cm =10000 mm = 100000 micron.