![]() ![]() The metric ruler is a handy on-screen ruler that allows you to easily take measurements in both cm and mm. The different measurements on the metric ruler The size is shown in mm or cm, depending on the unit you are using. Then click and drag your cursor along the item you want to measure. To measure anything, click the “start” button at the top of the page. To change the units of measurement, click the “mm” or “cm” buttons at the top of the page.ĥ. Click and drag the black bar to move the metric ruler across your screen.Ĥ. Place your cursor on the black bar at the top of the page.ģ. Open the Metric Ruler website in your browser.Ģ. The metric ruler is also perfect for any device, whether you’re using a laptop, tablet or smartphone. It’s great for anyone who needs quick and easy measurements, whether you’re a student, a teacher, or just need to measure something for a project. The metric ruler is a handy on-screen ruler with cm and mm measurements. ![]() It’s perfect for anyone who needs a quick and easy way to measure things on their screen. The Metric Ruler is a handy on-screen ruler that allows you to easily measure in cm and mm. For my Mac’s settings, (1800 pixels / 11.875 inches) * 2 = 303 ppi, and entering that in Screen Resolution lets Print Size show the Photoshop ruler at an on-screen size that matches a real ruler.Īlso important: For both Actual Size and Print Size to work properly, the document physical dimensions in inches/cm and the PPI resolution (you set both in Image > Image Size) must match the final reproduction dimensions and resolution.The Metric Ruler is the perfect tool for anyone who needs to measure things in cm or mm. With this handy ruler on the screen you can measure quickly and easily on your computer, tablet or phone. For a Retina/HiDPI display, take the pixel width from the UI scaling selected in Displays, as gener7 showed, and then after doing the calculation, double the result to compensate for 2x pixel density so that you get the correct number for Screen Resolution. Important: It gets tricky on a Retina (macOS) or HiDPI (Windows) display, which use 2x pixel density. If you don’t know the display resolution, you can work it out yourself using the method gener7 showed earlier in this thread. If Actual Size is not accurate, use View > Print Size after manually calibrating it by entering your screen resolution in Preferences / Units and Rulers / Screen Resolution. It does match up perfectly when your eye is directly above each marker.)Īctual Size might not be accurate with some computer and graphics hardware combinations. (It may look slightly off in the photo, but that is due to close up parallax. And you don’t have to know what any of the numbers are, it just works. When Actual Size is used, Photoshop gets the display pixel density from the Mac hardware, and uses that to correct the display magnification, so the Photoshop ruler matches the real ruler that is against the screen. The screen shot posted earlier by gener7 is from a Mac.īelow is the ruler in Photoshop on my MacBook Pro after choosing View > Actual Size in Photoshop. The Actual Size command works automatically on a Mac.Īll of the replies I posted are from my Mac. ![]()
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