4 centimeters to millimeters

Q: How many millimeters is 4 centimeters?

4 centimeters is 40 millimeters.

4 centimeters = 40 millimeters

Rounded to a practical precision: 40 mm.

centimeters

millimeters

How the calculation works

One centimeter is 10 millimeters, so:

4 cm × 10 = 40 mm

Reversing it, 40 millimeters ÷ 10 returns 4 centimeters.

Nearby values

Centimeters	Millimeters
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
5.5 cm	55 mm
6 cm	60 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 4 centimeters?

4 centimeters is 40 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