0.042 Millimeters to Inches

0.042 mm ≈ 0.0016535 in

Calculation: in = 0.042 mm × 0.0393701 ≈ 0.0016535 in

Millimeter to Inch Converter

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How long is 0.042 mm?

0.042 mm (0 cm) is a very small measurement — thinner than a pencil lead.

0.042 mm on the inch scale

mm00.010.020.030.040.05in00.00050.0010.0015

0.042 mm = 0.001654 in

How to Convert Millimeter to Inch

1 millimeter = 0.0393701 inches exact

Inch = Millimeter × 0.0393701

Example: 0.042 mm × 0.0393701 = 0.0016535 in

Reverse Conversion

To convert inches back to millimeters:

  • Remember, 1 inch equals 25.4 millimeters.
  • To convert 0.0016535 in to mm, multiply 0.0016535 x 25.4, resulting in 0.042 mm.

exact This conversion factor is exact by international definition.

0.042 mm is also equal to:

  • 0.0042 centimeter
  • 0.0001378 feet
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 0.042 millimeters in inches?

0.042 millimeters equals 0.0016535 inches. This is calculated by multiplying 0.042 by the conversion factor 0.0393701.

What does 0.042 millimeters look like in inches?

0.042 millimeters (0.0016535 inches) is thinner than a credit card edge (0.76mm).

How do you calculate 0.042 millimeters to inches?

Multiply 0.042 by the conversion factor 0.0393701. The calculation is 0.042 × 0.0393701 = 0.0016535 inches. This factor is defined by international measurement standards.

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0.042 millimeters = 0.00165354 inches
0.042 millimeters = 0.00165354 inches — conversion chart

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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.