4 millimeters to centimeters

Q: How many centimeters is 4 millimeters?

4 millimeters is 0.4 centimeters.

4 millimeters = 0.4 centimeters

Rounded to a practical precision: 0.4 cm.

millimeters

centimeters

How the calculation works

One millimeter is 0.1 centimeters, so:

4 mm × 0.1 = 0.4 cm

Reversing it, 0.4 centimeters ÷ 0.1 returns 4 millimeters.

Nearby values

Millimeters	Centimeters
2 mm	0.2 cm
2.5 mm	0.25 cm
3 mm	0.3 cm
3.5 mm	0.35 cm
4 mm	0.4 cm
4.5 mm	0.45 cm
5 mm	0.5 cm
5.5 mm	0.55 cm
6 mm	0.6 cm

About these units

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

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

Frequently asked questions

How many centimeters is 4 millimeters?

4 millimeters is 0.4 centimeters.

How do I convert millimeters to centimeters myself?

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

Is this figure exact?

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

Convert other values

Full millimeters to centimeters converter · All length converters