For inch scale, it is simply multiplied by 20. determines the length of the ruler in pixels, the corresponding real 50 centimeters: the PPI value is multiplied by expressed in inches 50 centimeters.calculates the PPI (pixels per inch) of the screen: the resulting diagonally expressed diagonal is divided by the user's diagonal value in inches.calculates the diagonal in pixels (it does not matter if the number of virtual pixels on which the browser operates is the actual physical resolution of the display).📏🔧 How the ruler’s actual size is achievedīased on the browser-defined screen height and width, the script: To avoid the known inconvenience associated with selecting a number by successive manual input, bring it to the desired value using the vertical scroll arrows that appear on the right side of the input field when you hover the cursor over it (when using the virtual ruler on a PC). Using this method in addition to the first method will allow you to determine the size of the display diagonal.

Change the diagonal value in the input field until the edge of the plastic card attached (oriented horizontally) to the screen coincides with the black stroke to the left of the icon. For your convenience, the corresponding sign is plotted under the scale of the ruler. Its standard width is 3.37 inches (3 3⁄8 inches), or 85.6 mm (8 centimeters, 56 millimeters) for the metric measurement. You can also calibrate the on-screen ruler using a bank payment card. If for some reason this information is difficult to obtain and you have a standard plastic card with you, you can use the second method. If you do not know the exact value of your screen’s diagonal, you can find it in the technical documentation attached to the device, or simply search the Internet for the model name. In this case, the initially visualized ruler will be suitable for measurements that do not require high accuracy (especially when measuring small objects). Nevertheless, the deviation may be minimal. Accordingly, to the best possible, the reliability of the indications of the uncalibrated online ruler will differ from the standard. Depending on the type and class of device, the probable error varies in a range of up to several centimeters, or 1 inch. This circumstance is caused by the existing constraint imposed by the specifics of the interaction of modern web browsers (none of which has the functionality of providing web applications with access to information about the display’s physical parameters) with operating systems. In most practical cases, this calculated value does not correspond to the real extent and is instead proposed for consideration as an approximate one for consideration purposes. The diagonal of the current device's display, automatically detected by the browser, is. This presents many of the most common options among users. You can also select the size from the drop-down list (which opens when you click the button ▾, which is adjacent to the numeric input field). Then click the ↹ Calibrate or press the button ↵ Enter on the keyboard. Enter this value in the input field located in the lower left corner of the ruler image. Specify the size of the diagonal of your screen in inches ('). You can calibrate it in one of the following two ways: 💁 How to use this online rulerįor the ruler to display correctly (i.e., in proportion to the actual physical size), it must be calibrated. The maximum length of the ruler (fully visible when displayed on a sufficient screen) is 20 inches, or 50 centimeters (500 millimeters) for the metric scale option. This online app works on both computers with a large screen (laptops, PCs, monoblocks or smart TVs) and mobile gadgets (phones, phablets, tablets, e-ink readers). You can make the necessary measurements on any device that allows you to browse the web. If you want to measure the actual size of a small object in inches or centimeters and you don’t have a real ruler at hand, this virtual on-screen online ruler will help you.

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