Convert Millimetre to Inch
Instantly convert Millimetre (mm) to Inch (in). Free and accurate.
About This Conversion
What is a Millimetre to Inch conversion?
One millimetre (mm) is equal to 0.0393700787 inch (in). This relationship is fixed by international measurement standards and does not change. To convert any number of millimetre to inch, multiply your value by 0.0393700787; to go the other way, divide by 0.0393700787.
How to convert Millimetre to Inch
The conversion formula is: 1 mm = 0.0393700787 in. Enter any value into the converter above and the result updates instantly. The formula is also shown alongside the answer so you can check the working or use it in your own calculations.
Where is this conversion used?
Length conversions are needed in construction, interior design, navigation, athletics, and everyday shopping — particularly when switching between metric and imperial products. Engineers, architects, surveyors, scientists, and runners regularly convert between units of length. Metric units (metres, kilometres) are the global standard, while miles, feet, and inches remain common in the United States and, to some degree, the United Kingdom.
Helpful tip
When measuring fabric, timber, or piping, always double-check which unit system your supplier uses before placing an order — a mix-up between feet and metres can be costly.
Formula
1 mm = 0.0393700787 in
mm to in Conversion Table
| mm | in |
|---|---|
| 0.1 mm | 0.0039370079 in |
| 0.5 mm | 0.0196850394 in |
| 1 mm | 0.0393700787 in |
| 2 mm | 0.0787401575 in |
| 5 mm | 0.1968503937 in |
| 10 mm | 0.3937007874 in |
| 20 mm | 0.7874015748 in |
| 25 mm | 0.9842519685 in |
| 50 mm | 1.96850394 in |
| 100 mm | 3.93700787 in |
| 250 mm | 9.84251969 in |
| 500 mm | 19.68503937 in |
| 1000 mm | 39.37007874 in |