3 centimeters to millimeters

Q: How many millimeters is 3 centimeters?

3 centimeters is 30 millimeters.

3 centimeters = 30 millimeters

Rounded to a practical precision: 30 mm.

centimeters

millimeters

How the calculation works

One centimeter is 10 millimeters, so:

3 cm × 10 = 30 mm

Reversing it, 30 millimeters ÷ 10 returns 3 centimeters.

Nearby values

Centimeters	Millimeters
1 cm	10 mm
1.5 cm	15 mm
2 cm	20 mm
2.5 cm	25 mm
3 cm	30 mm
3.5 cm	35 mm
4 cm	40 mm
4.5 cm	45 mm
5 cm	50 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 3 centimeters?

3 centimeters is 30 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