20 Millimeters to Centimeters

20 mm = 2 cm

Calculation: cm = 20 mm × 0.1 = 2 cm

Millimeter to Centimeter Converter

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How long is 20 mm?

20 mm (2 cm) is comparable to the width of a thumb or the diameter of a coin.

What does 20 mm look like?

Comparable to the width of a thumb or the diameter of a coin
20 mm (2 cm) is comparable to the width of a thumb or the diameter of a coin.

20 mm on the centimeter scale

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20 mm = 2 cm

Did you know? US penny diameter is 1.9 cm.

A US penny has a diameter of exactly 19.05 mm (1.905 cm / 0.75 in).

How to Convert Millimeter to Centimeter

1 millimeter = 0.1 centimeters exact

Centimeter = Millimeter × 0.1

Example: 20 mm × 0.1 = 2 cm

Reverse Conversion

To convert centimeters back to millimeters:

  • Remember, 1 centimeter equals 10 millimeters.
  • To convert 2 cm to mm, multiply 2 x 10, resulting in 20 mm.

exact This conversion factor is exact by international definition.

20 mm is also equal to:

About these units

Millimeter: Metric unit equal to one thousandth (1/1000) of a meter.

Centimeter: Metric unit equal to one hundredth (1/100) of a meter.

Frequently Asked Questions

How much is 20 millimeters in centimeters?

20 millimeters equals 2 centimeters. This is calculated by multiplying 20 by the conversion factor 0.1.

What does 20 millimeters look like in centimeters?

20 millimeters (2 centimeters) is about the width of a thumb or a standard bolt diameter.

How do you calculate 20 millimeters to centimeters?

Multiply 20 by the conversion factor 0.1. The calculation is 20 × 0.1 = 2 centimeters. This factor is defined by international measurement standards.

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20 millimeters = 2 centimeters
20 millimeters = 2 centimeters — conversion chart

Nearby Conversions

10 millimeters1 centimeter 11 millimeters1.1 centimeters 12 millimeters1.2 centimeters 13 millimeters1.3 centimeters 14 millimeters1.4 centimeters 15 millimeters1.5 centimeters 16 millimeters1.6 centimeters 17 millimeters1.7 centimeters 18 millimeters1.8 centimeters 19 millimeters1.9 centimeters 21 millimeters2.1 centimeters 22 millimeters2.2 centimeters 23 millimeters2.3 centimeters 24 millimeters2.4 centimeters 25 millimeters2.5 centimeters 26 millimeters2.6 centimeters 27 millimeters2.7 centimeters 28 millimeters2.8 centimeters 29 millimeters2.9 centimeters 30 millimeters3 centimeters

For general conversions between millimeters and centimeters, see the millimeters to centimeters converter.

Also convert Millimeters to:

Conversion factors verified against NIST, BIPM, ISO 80000-3 1 inch = 2.54 cm by international agreement (1959). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.