Millimeters to Centimeters Converter

1 millimeter = 0.1 centimeters. Multiply millimeters by 0.1 to get centimeters; divide centimeters by 0.1 to go back.

0.1
Centimeters → millimeters Formula: cm = mm ÷ 10
Quick: 1 mm 5 mm 10 mm 20 mm 50 mm 100 mm

millimeters to centimeters conversion table

millimetersCentimeters
1 mm 0.1 cm
2 mm 0.2 cm
3 mm 0.3 cm
4 mm 0.4 cm
5 mm 0.5 cm
6 mm 0.6 cm
7 mm 0.7 cm
8 mm 0.8 cm
millimetersCentimeters
9 mm 0.9 cm
10 mm 1 cm
20 mm 2 cm
50 mm 5 cm
100 mm 10 cm
500 mm 50 cm
1,000 mm 100 cm

How to convert millimeters to centimeters

Step 1

Take the value in millimeters.

10 mm

Step 2

Divide by 10.

10 ÷ 10

Step 3

Round to the precision you need.

= 1 cm

The millimeter and the centimeter are both defined in terms of the metre and the kilogram, so this factor is exact, not an approximation.

Table of Contents

Millimetres to centimetres in one step

Both units belong to the metric system and both are defined from the metre: a centimetre is one hundredth of a metre and a millimetre is one thousandth. That makes the ratio exactly 10, so 1 mm = 0.1 cm and 10 mm = 1 cm. To convert, divide the number of millimetres by 10, which is the same as moving the decimal point one place to the left: 25 mm becomes 2.5 cm, 7 mm becomes 0.7 cm, and 150 mm becomes 15 cm. The factor is exact, so there is no rounding error in either direction.

Reading a ruler

On a metric ruler the numbered marks are centimetres and the small marks between them are millimetres. A length that ends four small marks past the 3 is 3 cm and 4 mm, written 3.4 cm or 34 mm. Engineering drawings, screws and machine parts are usually given in millimetres to avoid decimals; everyday objects such as paper, shoes and furniture are more often described in centimetres.

Sizes you already know

A credit card is about 0.76 mm thick, a modern phone around 8 mm, which is 0.8 cm. A standard pencil is 7 mm wide. A4 paper is 210 mm by 297 mm, or 21 cm by 29.7 cm. Rain gauges report millimetres, and 10 mm of rain is a centimetre of water on flat ground.

What is a millimeter?

A millimeter is a unit of length in the metric system, equal to one-thousandth of a meter or 0.001 meters.

What is a centimeter?

A centimeter is a unit of length in the metric system, equal to one-hundredth of a meter or 0.01 meters.

Common millimeters to centimeters conversions

0.1 mm → 0.01 cm 0.2 mm → 0.02 cm 0.25 mm → 0.025 cm 0.3 mm → 0.03 cm 0.37 mm → 0.037 cm 0.4 mm → 0.04 cm 0.5 mm → 0.05 cm 0.6 mm → 0.06 cm 0.68 mm → 0.068 cm 0.7 mm → 0.07 cm 0.75 mm → 0.075 cm 0.8 mm → 0.08 cm 0.9 mm → 0.09 cm 1 mm → 0.1 cm 1.1 mm → 0.11 cm 1.5 mm → 0.15 cm 1.6 mm → 0.16 cm 2 mm → 0.2 cm 2.3 mm → 0.23 cm 2.5 mm → 0.25 cm 2.6 mm → 0.26 cm 2.8 mm → 0.28 cm 2.9 mm → 0.29 cm 3 mm → 0.3 cm

These are the values people actually search for. Any other number works in the converter above; only these pages are listed for search engines.

Frequently asked questions

How many mm are in 1 cm?
There are exactly 10 millimetres in one centimetre, so 1 cm = 10 mm and 1 mm = 0.1 cm.
Is 5 mm half a centimetre?
Yes. 5 mm ÷ 10 = 0.5 cm, exactly half a centimetre.
What is 25 mm in cm?
25 mm is 2.5 cm. Divide by 10, or move the decimal point one place to the left.
How do I convert cm back to mm?
Multiply the centimetres by 10. 3.4 cm × 10 = 34 mm.
Which is bigger, a millimetre or a centimetre?
A centimetre is ten times bigger than a millimetre. Anything measured in millimetres has a smaller unit and a larger number for the same length.

Related converters

millimeters → Meters1 mm = 0.001 m millimeters → Kilometers1 mm = 0.000001 km millimeters → Feet1 mm = 0.00328084 ft millimeters → Inches1 mm = 0.0393701 inch millimeters → miles1 mm = 0.00000062 mi millimeters → Centimeters1 mm = 0.1 cm
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