4.242 Millimeters to Inches

4.242 mm ≈ 0.16701 in

Closest fraction: 1164″(0.17188 in — differs by ~3%)

Calculation: in = 4.242 mm × 0.0393701 ≈ 0.16701 in

Millimeter to Inch Converter

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How long is 4.242 mm?

4.242 mm (0.42 cm) is a very small measurement — thinner than a pencil lead.

4.242 mm on the inch scale

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4.242 mm = 0.167 in

How to Convert Millimeter to Inch

1 millimeter = 0.0393701 inches exact

Inch = Millimeter × 0.0393701

Example: 4.242 mm × 0.0393701 = 0.16701 in

Reverse Conversion

To convert inches back to millimeters:

  • Remember, 1 inch equals 25.4 millimeters.
  • To convert 0.16701 in to mm, multiply 0.16701 x 25.4, resulting in 4.242 mm.

exact This conversion factor is exact by international definition.

4.242 mm is also equal to:

  • 0.4242 centimeter
  • 0.004242 meter
  • 0.013917 feet
  • 0.0046391 yard
About these units

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

Inch: Imperial/US customary unit standardized as exactly 25.4 millimeters since 1959.

Frequently Asked Questions

How much is 4.242 millimeters in inches?

4.242 millimeters equals 0.16701 inches. This is calculated by multiplying 4.242 by the conversion factor 0.0393701.

What does 4.242 millimeters look like in inches?

4.242 millimeters (0.16701 inches) is about the thickness of a few coins stacked or a pencil lead.

How do you calculate 4.242 millimeters to inches?

Multiply 4.242 by the conversion factor 0.0393701. The calculation is 4.242 × 0.0393701 = 0.16701 inches. This factor is defined by international measurement standards.

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4.242 millimeters = 0.167008 inches
4.242 millimeters = 0.167008 inches — conversion chart

Nearby Conversions

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For general conversions between millimeters and inches, see the millimeters to inches 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.