# Instant PX to

Mm Converter

Instantly Convert Pixels to the

Real World Unit Mm, and Vice Versa.

### Pixels

### MM

### DPI (Dots Per Inch)

•••

## How to Use Instant PX to Mm Converter

This simple calculator instantly converts pixels (PX) to Millimeters (mm).

By default, the calculator assumes a default DPI of 96, which is quite common in web development. However, you have the option to customize this default setting to match your preferred screen DPI.

Tell me how to use ...

Sure

The conversions occur in real-time as you type, and with just a click, you can effortlessly copy the result to your clipboard.

Like this:

How about Px to Cm?

You can do that too.

## Convert PX to Other Units

Yep, you can turn pixels (px) into points (pt), centimeters (cm), ems (em), or rems (rem), super fast.

That's nice ... 👍

## Pixels and Millimeters

•••

**The pixel**, abbreviated as ‘px’, is the basic unit of programmable color on a digital display.

Each pixel is a sample of an original image, whereas more samples typically provide a more accurate representation of the original.

On the flip side, we have **Millimeters.**

A millimeter, the smallest standard metric measurement, is a unit of length equal to one thousandth of a meter. Millimeters, part of our everyday life, are extensively used in the real-world measurement of small objects.

## Converting Px to Mm

Converting from pixels to millimeters involves a key component **DPI (Dots Per Inch)** or PPI (Pixels Per Inch), the measure of pixel density or the resolution of a screen.

Under standard screen conditions (96 DPI, a common desktop screen resolution), the formula to convert pixels to millimeters is as follows:

**millimeters = pixels / (DPI / 25.4)**

Here ‘25.4’ is the number of millimeters in an inch. So, if we have a 200px image displayed on a standard screen, using the formula, we get:

**millimeters = 200px / (96 / 25.4) ≈ 52.92mm**

This conversion implies an on-screen display. For print contexts, you might use a DPI of 300 or 600, as these are standard print resolutions.

The actual physical size that a pixel measurement represents can change drastically between different devices due to the variance in DPI.

## And What's the Relevance?

I know.

It seems unorthodox to consider millimeters in digital design, there are practical applications.

Perhaps you’re designing a web layout for products measured in millimeters, like small electronic components, jewelry, or eyeglasses. In these cases, an understanding of pixels to millimeters can be instrumental in creating accurate visual representations.

Imagine you are designing a digital blueprint for a piece of custom jewelry that measures 20mm. Knowing the conversion between pixels and millimeters, you can create a design that will appear true to size when viewed on a standard screen.

And of course that’s just one senario.

## The Inception of the Millimeter

The millimeter is a unit of length in the metric system, equal to one thousandth of a meter.

The metric system**,** which includes millimeters, was first introduced by the French in the late 18th century, around the time of the French Revolution.

The objective was to simplify the various systems of weights and measures in existence at that time. In this system, all units are divisible by 10, simplifying calculations and conversions.

The millimeter, along with other metric units, was officially adopted in France in 1799. Since then, it has become the standard for measurements in most countries around the world, with the notable exception of the United States, which predominantly uses the Imperial system.

**So how did millimeters, a unit of physical measurement, make their way into the digital domain?**

As I mentioned above, The use of millimeters in digital design is primarily due to the need for precise physical dimensions in specific contexts.

When designing interfaces or content that reference real-world objects or are intended for print, using real-world units like millimeters can provide a more intuitive sense of scale.

Here is another example …

Take a designer who is working on a project that calls for producing a poster or designing a layout for a product with exact measurements. The designer may provide an accurate picture of how the finished product will seem in real life by employing millimeters during the design phase.

In addition, with the advent of CSS (Cascading Style Sheets) in web design, millimeters were included as one of the standard units.

In CSS, the millimeter unit is absolute, based on the physical measurements of the output device (typically a screen). However, in practice, the precise rendering of millimeters can vary between devices due to differences in screen size, resolution, and pixel density.