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40 centimeters to millimeters

40 centimeters = 400 millimeters

Rounded to a practical precision: 400 mm.

How the calculation works

One centimeter is 10 millimeters, so:

40 cm × 10 = 400 mm

Reversing it, 400 millimeters ÷ 10 returns 40 centimeters.

Nearby values

CentimetersMillimeters
36 cm360 mm
37 cm370 mm
38 cm380 mm
39 cm390 mm
40 cm400 mm
41 cm410 mm
42 cm420 mm
43 cm430 mm
44 cm440 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 40 centimeters?

40 centimeters is 400 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