How MM to PX Calculator Works
The conversion between millimeters and pixels isn't static—it depends entirely on the resolution of the device, measured in PPI (Pixels Per Inch).
By default, web standards use 96 PPI. However, high-quality print work often requires 300 PPI. Our calculator allows you to adjust the PPI to get precise dimensions for screen design, print layout, or CSS styling.
Millimeters to Pixels Formula:
pixels = mm × (PPI / 25.4)
Pixels to Millimeters Formula:
mm = pixels × (25.4 / PPI)
Millimeter to Pixel (X) Conversion Table (at 96 PPI)
| Millimeters (mm) | Pixels (px) |
|---|---|
| 1 mm | 3.78 px |
| 5 mm | 18.90 px |
| 10 mm | 37.80 px |
| 20 mm | 75.59 px |
| 50 mm | 188.98 px |
| 100 mm | 377.95 px |
Frequently Asked Questions
How many px is 1 mm? ▾
It depends on the screen resolution. At a standard web resolution of 96 PPI, 1 mm equals approximately 3.78 pixels.
Is 1 px equal to 1 mm? ▾
No. A pixel is the smallest unit of a digital image, while a millimeter is a physical unit of length. They are only "equal" if your screen has a density of exactly 25.4 PPI, which is very rare.
How much is 35 mm in px? ▾
Using standard web resolution (96 PPI), 35 mm is approx 132.28 px. For high-quality print (300 PPI), 35 mm would be approx 413.39 px.
How to use Pixels to Millimeters Converter? ▾
simply enter the value in the "Pixels" field. The calculator automatically divides your pixels by the PPI setting and multiplies by 25.4 to give you the millimeter equivalent.