iRuler – Measure the size of your screen and the actual image size.ImageJ – Analyze pictures and calculate the sizes of objects inside.MB-Ruler – Best on-screen measurement tool overall.Here are the top options to help you find out various measurements either in the real world or virtually on the screen. This gives you a Pixels Per Inch (PPI) number which you can then enter into the ruler utility. Once you have this information, visit the DPI / PPI Calculator webpage and enter the horizontal and vertical resolutions, and the diagonal screen size. Using a value of 22 inches when your monitor is actually 21.5 inches will produce an inaccurate measurement and needs to be as close as possible. 1920×1080) and its exact visible display size in inches. So, you need to know the resolution of the current display (e.g. Some options can calibrate against a real-world object of known dimensions, but most won’t. The calibration might differ from screen to screen depending on resolutions and physical screen sizes. To use a ruler for measuring a physical object, it needs to be well calibrated correctly. Whether you want to find out if an object is in the correct position in your graphic work or the dimensions of a real object but don’t have a ruler or tape measure in hand, there are virtual rulers to help you out. Of course, computers can easily tell how many pixels are on the screen, but actually measuring something in inches or centimeters is tricky. ![]() You wouldn’t turn to your computer as the first alternative to get the dimensions of a physical object.
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