42.159 Millimeters to Inches

42.159 mm ≈ 1.6598 in

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

Calculation: in = 42.159 mm × 0.0393701 ≈ 1.6598 in

Millimeter to Inch Converter

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Sig. Figures:

How long is 42.159 mm?

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

What does 42.159 mm look like?

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

42.159 mm on the inch scale

mm01020304050in00.511.5

42.16 mm = 1.66 in

How to Convert Millimeter to Inch

1 millimeter = 0.0393701 inches exact

Inch = Millimeter × 0.0393701

Example: 42.159 mm × 0.0393701 = 1.6598 in

Reverse Conversion

To convert inches back to millimeters:

  • Remember, 1 inch equals 25.4 millimeters.
  • To convert 1.6598 in to mm, multiply 1.6598 x 25.4, resulting in 42.159 mm.

exact This conversion factor is exact by international definition.

42.159 mm is also equal to:

  • 4.2159 centimeter
  • 0.042159 meter
  • 0.13832 feet
  • 0.046106 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 42.159 millimeters in inches?

42.159 millimeters equals 1.6598 inches. This is calculated by multiplying 42.159 by the conversion factor 0.0393701.

What does 42.159 millimeters look like in inches?

42.159 millimeters (1.6598 inches) is one to four inches — a small component or connector.

How do you calculate 42.159 millimeters to inches?

Multiply 42.159 by the conversion factor 0.0393701. The calculation is 42.159 × 0.0393701 = 1.6598 inches. This factor is defined by international measurement standards.

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42.159 millimeters = 1.6598 inches
42.159 millimeters = 1.6598 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.