42.317 Millimeters to Inches

42.317 mm ≈ 1.666 in

Closest fraction: 1 4364(1.67188 in — differs by less than 1%)

Calculation: in = 42.317 mm × 0.0393701 ≈ 1.666 in

Millimeter to Inch Converter

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Sig. Figures:

How long is 42.317 mm?

42.317 mm (4.23 cm) is comparable to the width of a thumb or the diameter of a coin.

What does 42.317 mm look like?

Comparable to the width of a thumb or the diameter of a coin
42.317 mm (4.23 cm) is comparable to the width of a thumb or the diameter of a coin.

42.317 mm on the inch scale

mm01020304050in00.511.5

42.32 mm = 1.666 in

How to Convert Millimeter to Inch

1 millimeter = 0.0393701 inches exact

Inch = Millimeter × 0.0393701

Example: 42.317 mm × 0.0393701 = 1.666 in

Reverse Conversion

To convert inches back to millimeters:

  • Remember, 1 inch equals 25.4 millimeters.
  • To convert 1.666 in to mm, multiply 1.666 x 25.4, resulting in 42.317 mm.

exact This conversion factor is exact by international definition.

42.317 mm is also equal to:

  • 4.2317 centimeter
  • 0.042317 meter
  • 0.13884 feet
  • 0.046278 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 42.317 millimeters in inches?

42.317 millimeters equals 1.666 inches. This is calculated by multiplying 42.317 by the conversion factor 0.0393701.

What does 42.317 millimeters look like in inches?

42.317 millimeters (1.666 inches) is one to four inches — a small component or connector.

How do you calculate 42.317 millimeters to inches?

Multiply 42.317 by the conversion factor 0.0393701. The calculation is 42.317 × 0.0393701 = 1.666 inches. This factor is defined by international measurement standards.

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42.317 millimeters = 1.66602 inches
42.317 millimeters = 1.66602 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.