10 online life-size rulers

When you need to quickly measure something, but as luck would have it, you don’t have a centimeter or a tape measure at hand, an online ruler will help out. It is a simple web-based tool that appears on your device's screen in full size. It allows you to quite accurately determine the size of a drill, a notepad, or any other object that can be applied to a computer monitor or smartphone screen.

1. PiliApp

Very accurate online ruler with a scale in millimeters. Automatically detects screen diagonal and resolution, and then immediately calibrates. Supports work on mobile devices.

In addition to the usual line, the site contains “digital copies» more than 400 life-size items that will help you understand the real sizes of smartphones, watches and other things and compare them with those at hand.

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2. GetRuler

This online ruler allows you to set the dimensions of an object by adjusting the area on the screen, and immediately see the measurement result with an accuracy of one hundredth of a centimeter. Four scales are located around the perimeter of the screen, which is convenient for measuring large objects. The service is not adapted for mobile devices, so it is better to use it on a computer.

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3. Precise Ruler

PreciseRuler offers regular and angled rulers in centimeters and inches. If the scale is detected incorrectly, you can manually calibrate by specifying the display diagonal in inches. The tool works correctly on both computers and mobile devices.

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4. Ginifab

This is a life-size straight online ruler with a main scale in centimeters, which is duplicated by a scale in inches. For the latter, you can set the pitch of intermediate divisions from 1/8 to 1/32 inches. To calibrate, you must select one of the objects with a known size in the drop-down menu, for example credit card, and adjust the ruler scale to it. You can also use Ginifab on smartphones and tablets.

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5. Lineykasm

A simple ruler with a dual scale in centimeters and inches, which can be personalized by adjusting its color and length. To get accurate data, you first need to calibrate the instrument by holding a matchbox, credit card or banknote to the screen. Lineykasm is supported on both desktop and mobile browsers.

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6. iRuler

Another minimalistic and precise tool with a stylized appearance of a wooden ruler, familiar to everyone since school days. Works on computer and smartphone. The scale is double. Calibration is carried out automatically depending on the screen resolution, but if it doesn’t work, you can force the desired diagonal to be specified.

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7. Ruler online

Like others, this service allows you to find out the size of small items using a ruler on the screen. To calibrate the scale in centimeters you need to specify the diagonal monitor manually. Additionally, here you can find a template for printing the ruler on a printer. The tool works on mobile devices, but not very well - it is still better to use it on a PC.

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8. Online ruler cm/mm

Convenient life-size ruler with contrasting yellow scale. Shows size in centimeters or inches. It calibrates automatically, but for greater accuracy you can specify the screen diagonal yourself or check the scale using a standard credit card.

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9. Ruler

Mobile online version of the line application for iPhone, which is convenient to use on any smartphone. It has three scales at once: on both edges and in the center of the screen with alternating colors every 5 mm. If the screen diagonal is determined incorrectly, it can be corrected manually.

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10. Actual Size Ruler

A fairly simple real-size ruler with a scale in inches and fine high-resolution marks, which make it much easier to achieve measurement accuracy. The service makes it possible to rotate the tool from horizontal to vertical position and back. It calibrates automatically, but only works in desktop browsers.

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