42 mm to Inches
42 mm ≈ 1.65 in
42 millimeters is approximately 1.65 inches.
How to convert 42 mm to in
Use the formula in = mm ÷ 25.4:
in = 42 ÷ 25.4in = 1.653543
So 42 mm = 1.653543 in, or about 1.65 in rounded.
Rounded values and quick estimate
- Rounded to a whole number: 2 in
- Rounded to one decimal place: 1.7 in
- Conversion factor: 1 millimeter = 0.0394 inches
Quick mental estimate: divide by 25. For 42 mm that gives about 1.68 in — off by 0.0265 in (1.6%). Use the exact formula when precision matters.
42 mm in other units
- Inches
- 1.65 in
- Centimeters
- 4.2 cm
- Meters
- 0.042 m
- Kilometers
- 0.000042 km
- Feet
- 0.1378 ft
- Yards
- 0.0459 yd
- Miles
- 0.000026 mi
- Micrometers
- 42000 µm
- Hands
- 0.4134 hh
- Nautical miles
- 0.000023 nmi
- Mils (thou)
- 1653.54 mil
42 mm and nearby values
About millimeters and inches
A millimeter is one thousandth of a meter (0.1 cm). It is used for small, precise measurements like rainfall, screws and paper thickness.
An inch is defined as exactly 2.54 centimeters. There are 12 inches in a foot; inches are used in the US for screens, heights and small lengths.
Related conversions
Frequently asked questions
What is 42 mm in Inches?
42 millimeters is about 1.65 inches (42 mm ≈ 1.65 in).
How do you convert 42 mm to in?
Apply in = mm ÷ 25.4: in = 42 ÷ 25.4, in = 1.653543.
How many millimeters is 1.65 in?
1.65 in is about 41.91 millimeters.