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30 centimeters to millimeters

30 centimeters = 300 millimeters

Rounded to a practical precision: 300 mm.

How the calculation works

One centimeter is 10 millimeters, so:

30 cm × 10 = 300 mm

Reversing it, 300 millimeters ÷ 10 returns 30 centimeters.

Nearby values

CentimetersMillimeters
26 cm260 mm
27 cm270 mm
28 cm280 mm
29 cm290 mm
30 cm300 mm
31 cm310 mm
32 cm320 mm
33 cm330 mm
34 cm340 mm

About these units

Centimeter (cm) — A centimetre is one hundredth of a metre, the everyday metric unit for body measurements and small objects.

Millimeter (mm) — A millimetre is one thousandth of a metre and is the default unit on engineering drawings and rulers.

Frequently asked questions

How many millimeters is 30 centimeters?

30 centimeters is 300 millimeters.

How do I convert centimeters to millimeters myself?

Multiply by 10. To go back, divide by 10 — or multiply by 0.1.

Is this figure exact?

The conversion factor between the centimeter and the millimeter is fixed by definition. The figure above is rounded for readability; the converter carries full precision.

Convert other values

Full centimeters to millimeters converter · All length converters