Millimeters to Centimeters (mm to cm) Converter

1 millimeter equals 0.1 centimeters — divide the number of millimeters by 10 to convert. There are exactly 10 millimeters in a centimeter, so a millimeter is one tenth of a centimeter. That makes 25 mm equal to 2.5 cm and 100 mm equal to 10 cm.

The formula

To convert millimeters to centimeters, multiply by 0.1 (or divide by 10):

centimeters = mm × 0.1

For example, 25 mm ÷ 10 = 2.5 cm. To reverse it, multiply centimeters by 10.

Conversion table

How to convert online

1. Type the number of millimeters into the first box.
2. Read the equivalent in centimeters instantly in the second box.
3. Type a centimeter value instead to convert back to millimeters — it works both ways.

Use the Millimeter to Centimeter Converter — free and instant in your browser.

Where this conversion is used

Millimeters-to-centimeters conversion is constant in sewing and tailoring, engineering drawings, DIY and woodworking, and schoolwork, wherever a ruler marked in millimeters needs reading in the more familiar centimeter scale.

FAQ

How many centimeters are in a millimeter?

One millimeter equals 0.1 centimeters, because a centimeter contains exactly 10 mm.

What is the formula to convert millimeters to centimeters?

Multiply the mm value by 0.1, or divide by 10: cm = mm ÷ 10. For example, 50 mm = 5 cm.

How do I convert centimeters back to millimeters?

Multiply the centimeter value by 10. So 2.5 cm × 10 = 25 mm.

Is the conversion exact?

Yes. The millimeter-to-centimeter relationship is defined exactly as 1/10, with no rounding.

Related converters

• Centimeter to Millimeter Converter
• Millimeter to Meter Converter
• Millimeter to Inch Converter
• Millimeter to Foot Converter

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