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We've been explaining "pixels" to others since the days of the IBM CGA monitor. Our articles and calculators have appeared on many web sites over the years but now have a permanent home of their own here at pixelyzer.com. If someone referred you here to get a better understanding of the concept of a "pixel," you are at the right place. If you've already mastered the subject, our calculators and other resources are here on the other pages of this site.

We'll start with a discussion of pixels as they relate to your visit here, I.E. the resolution and physical size of the monitor or other device you are using to view this page. This worksheet and a ruler or tape measure will help you begin to visualize the relationships of virtual and physical elements used to present images and graphics on modern digital devices.

Here is some information reported by your device. This information may sometimes be missing or incorrect due to software bugs. If it is obviously wrong, you can correct it by entering the correct values in the form.

Your Display Resolution
(width) Pixels Across: pixels
(height) Pixels up and down: pixels

Next, you may want to change the physical unit of measure for our pages:


Pixels are pixels no matter the measuring system, however, to discuss physical measurements, such as height and width, an understandable unit of measure is required. The calculators and reports on this site work with physical measurements using either inches (in) or Centimeters (cm). If you have a preference, you can set it here and all further calculations will default to your choice. (You'll need to measure your display in the next step so choose the measurement system which matches your tape or ruler)

Finally, using the information provided, this system will calculate the precise number of pixels per unit of measure and create an image of an exact measurement for you to measure/compare right on your display.

Aspect: 4/3  16/9 other

Pixels Per Unit Width:
Pixels Per Unit height:
Measure your monitor and enter the measurements in the height and width fields. Be sure to measure only the active display portion of the screen. Some screens reserve a border or margin which is not part of the display. Also, it is possible to set the output from your PC to a non-standard setting which will not fill the entire display surface. If your display contains an unused margin because of a setting, try to measure only the portion which displays an active screen image.

Shaded (informational) areas in this form are computed from the other available data and can not be changed. If accurate information is input, and there are no settings issues with the input signal, the system should generate a reading for the pixels per inch (or centimeter) and generate an accurate image for you to measure.