1 mm to Inches
1 mm ≈ 0.0394 in
1 millimeter is approximately 0.0394 inches.
How to convert 1 mm to in
Use the formula in = mm ÷ 25.4:
in = 1 ÷ 25.4in = 0.03937
So 1 mm = 0.03937 in, or about 0.0394 in rounded.
Rounded values and quick estimate
- Rounded to a whole number: 0 in
- Rounded to one decimal place: 0 in
- Conversion factor: 1 millimeter = 0.0394 inches
Quick mental estimate: divide by 25. For 1 mm that gives about 0.04 in — off by 0.00063 in (1.6%). Use the exact formula when precision matters.
1 mm in other units
- Inches
- 0.0394 in
- Centimeters
- 0.1 cm
- Meters
- 0.001 m
- Kilometers
- 0.000001 km
- Feet
- 0.003281 ft
- Yards
- 0.001094 yd
- Micrometers
- 1000 µm
- Hands
- 0.009843 hh
- Mils (thou)
- 39.37 mil
1 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 1 mm in Inches?
1 millimeter is about 0.0394 inches (1 mm ≈ 0.0394 in).
How do you convert 1 mm to in?
Apply in = mm ÷ 25.4: in = 1 ÷ 25.4, in = 0.03937.
How many millimeters is 0.0394 in?
0.0394 in is about 1 millimeters.