Pixels to Millimeters Converter
A millimeter (mm) is a common measurement unit but is not frequently used on CSS or print media. But, if a need arise that you to get the equivalent of px to mm, this Pixels to Millimeters Converter can be very handy.
How to Use Pixels to Millimeters Converter
- Step 1: Enter the Pixels Per Inch (PPI).
- Step 2: Input the pixels value you want to convert.
- Step 3: Press enter key or click the convert button to start the conversion.
What is PPI?
Pixels Per Inch or PPI, is used to measure how many pixels are there in one inch. For web-related designs/development, there are 96px in 1inch. However, if you are doing some photo editing work, the PPI (some call it DPI or Resolution) must be set to your desired output.
For example, you want a 200mm x 100mm image to be printed that looks the same on your design, you might want to set that PPI to 300ppi.
Pixels to Millimeters Conversion Table
| Pixels | Millimeters |
|---|---|
| 37.8px | 10mm |
| 56.69px | 15mm |
| 75.59px | 20mm |
| 94.49px | 25mm |
| 113.39px | 30mm |
| 132.28px | 35mm |
| 151.18px | 40mm |
| 170.08px | 45mm |
| 188.98px | 50mm |
| 207.87px | 55mm |
| 226.77px | 60mm |
| 245.67px | 65mm |
| 264.57px | 70mm |
| 283.46px | 75mm |
| 302.36px | 80mm |
| 321.26px | 85mm |
| 340.16px | 90mm |
| 359.06px | 95mm |
| 377.95px | 100mm |
| 755.91px | 200mm |
| 1133.86px | 300mm |
| 1511.81px | 400mm |
| 1889.76px | 500mm |
How to Convert Pixels to Millimeters
Here are the conversions from World Wide Web Consortium:
| Name | Equivalence |
|---|---|
| millimeters | 1mm = 1/10th of 1cm |
| inches | 1in = 2.54cm |
| pixels | 1px = 1/96th of 1in |
So base on the unit conversions above, what we want to come up is that we want to get the equivalent of 1px to mm.
Considering that 1mm = 1/10th of 1cm, we can parse that value to get the inches:
1in = 2.54cm x 10 (*because there is 10mm in 1cm)
The result would be:
1in = 25.4mm
So base on the pixels conversion above, and the fact that 1 inch = 25.4 millimeters,
96px = 25.4mm
In other words,
1px = 25.4mm / 96
This yields to the result that 1mm is equal to 3.77952755906
Note: the 96px there is the Pixels Per Inch. In web, there are 96px in 1 inch. But in other screen and print media, you might need to set this to PPI value (ex: 300ppi)
Pixels to Millimeters Formula:
millimeters = pixels * ( 25.4 / PPI )
Note: If you are working with web or css, the default PPI is 96px.