0.042 Inches to Millimeters

0.042 in = 1.0668 mm

Calculation: mm = 0.042 in × 25.4 = 1.0668 mm

Inch to Millimeter Converter

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How long is 0.042 in?

0.042 in (0.11 cm) is a very small measurement — thinner than a pencil lead.

0.042 in on the millimeter scale

in00.010.020.030.040.05mm00.20.40.60.811.2

0.042 in = 1.067 mm

Did you know? Thickness of a credit card is 0.1 cm.

A standard credit card is about 0.76 mm (0.076 cm) thick — less than 1 millimeter.

How to Convert Inch to Millimeter

1 inch = 25.4 millimeters exact

Millimeter = Inch × 25.4

Example: 0.042 in × 25.4 = 1.0668 mm

Reverse Conversion

To convert millimeters back to inches:

  • Remember, 1 millimeter equals 0.0393701 inches.
  • To convert 1.0668 mm to in, multiply 1.0668 x 0.0393701, resulting in 0.042 in.

exact This conversion factor is exact by international definition.

0.042 in is also equal to:

  • 0.10668 centimeter
  • 0.0010668 meter
  • 0.0035 feet
  • 0.0011667 yard
About these units

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

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

Frequently Asked Questions

How much is 0.042 inches in millimeters?

0.042 inches equals 1.0668 millimeters. This is calculated by multiplying 0.042 by the conversion factor 25.4.

What does 0.042 inches look like in millimeters?

0.042 inches (1.0668 millimeters) is smaller than a thumb width.

How do you calculate 0.042 inches to millimeters?

Multiply 0.042 by the conversion factor 25.4. The calculation is 0.042 × 25.4 = 1.0668 millimeters. This factor is defined by international measurement standards.

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0.042 inches = 1.0668 millimeters
0.042 inches = 1.0668 millimeters — conversion chart

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

Also convert Inches 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.