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This ruler starts at the standard browser scale of 96 pixels per inch, a reasonable approximation but not a physical guarantee. Your screen's real pixel density, any operating system display scaling, and your browser zoom level all change how many pixels actually cover an inch of glass. Calibrate it against a bank card or another object of known size to get a scale that matches your screen and browser window right now.

Calibration matches the scale to your current screen and browser zoom. Changing the browser zoom level, the display's operating system scaling, or moving the window to a different monitor can all shift the pixels-per-inch again, so recalibrate after any of those. Reading accuracy also depends on how carefully you line up the zero mark and the marker with the object's edges, and on the flatness of your screen surface and bezel. Please do not press sharp, heavy or hot objects against your screen while measuring.