42.175 Millimeters to Inches

42.175 mm ≈ 1.6604 in

Closest fraction: 1 2132(1.65625 in — differs by less than 1%)

Calculation: in = 42.175 mm × 0.0393701 ≈ 1.6604 in

Millimeter to Inch Converter

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Sig. Figures:

How long is 42.175 mm?

42.175 mm (4.22 cm) is comparable to the width of a thumb or the diameter of a coin.

What does 42.175 mm look like?

Comparable to the width of a thumb or the diameter of a coin
42.175 mm (4.22 cm) is comparable to the width of a thumb or the diameter of a coin.

42.175 mm on the inch scale

mm01020304050in00.511.5

42.18 mm = 1.66 in

How to Convert Millimeter to Inch

1 millimeter = 0.0393701 inches exact

Inch = Millimeter × 0.0393701

Example: 42.175 mm × 0.0393701 = 1.6604 in

Reverse Conversion

To convert inches back to millimeters:

  • Remember, 1 inch equals 25.4 millimeters.
  • To convert 1.6604 in to mm, multiply 1.6604 x 25.4, resulting in 42.175 mm.

exact This conversion factor is exact by international definition.

42.175 mm is also equal to:

  • 4.2175 centimeter
  • 0.042175 meter
  • 0.13837 feet
  • 0.046123 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 42.175 millimeters in inches?

42.175 millimeters equals 1.6604 inches. This is calculated by multiplying 42.175 by the conversion factor 0.0393701.

What does 42.175 millimeters look like in inches?

42.175 millimeters (1.6604 inches) is one to four inches — a small component or connector.

How do you calculate 42.175 millimeters to inches?

Multiply 42.175 by the conversion factor 0.0393701. The calculation is 42.175 × 0.0393701 = 1.6604 inches. This factor is defined by international measurement standards.

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42.175 millimeters = 1.66043 inches
42.175 millimeters = 1.66043 inches — conversion chart

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

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