Monitor Size Calculator: how to use the result
The monitor size calculator converts the visible width and height of a rectangular display into a diagonal measurement. It is useful when you have a tape measure but no model information, or when you want to compare the physical screen you own with a nominal size in a product listing. Measure the image area rather than the outer enclosure.
How to use this workspace
- Measure the visible width in centimeters, from one edge of the image area to the other.
- Measure the visible height in the same units, leaving out the bezel and stand.
- Enter both measurements and read the diagonal in centimeters and inches. Repeat the measurement if the result seems inconsistent.
A practical example
For a visible area 60 cm wide and 34 cm high, the diagonal is √(60² + 34²), or about 68.96 cm. Dividing by 2.54 gives approximately 27.15 inches. Small differences from a marketed 27-inch size can come from rounded measurements and nominal product labeling.
How to interpret your result
The result is the diagonal of the rectangle defined by your measurements. It does not include the frame or tell you how much desk space the stand requires. Two displays with the same diagonal can still have different widths and heights if their aspect ratios differ.
Common mistakes and limits
Do not mix centimeters and inches in the input fields. Measuring along a curved surface is also different from measuring a straight chord, so this simple rectangular calculation should not be treated as a model-specific curved-panel specification.
Build a useful scenario
Keep the units shown next to the fields consistent, then change one assumption at a time. A precise-looking output can still come from an uncertain input. Compare a conservative case with your expected case rather than treating a single estimate as a guarantee. Where you have a measured value or a product specification, use it in place of an illustrative default. The starting numbers demonstrate the calculation; they are not readings taken from your device.
Frequently asked questions
Should I include the black border around the screen?
Measure the visible display area for a screen-size estimate. The enclosure border belongs to the product’s external dimensions, which are a separate measurement.
Can the browser measure the monitor for me?
This tool uses your physical measurements. Browser viewport dimensions do not reliably reveal the real diagonal of the connected display.