How to Use Your Computer Screen as a Ruler: A Simple Guide

Are you tired of relying on physical rulers for measuring purposes? With the advancement of technology, it's now possible to use your computer screen as a virtual ruler. All you need is a web browser and a credit card to compare physical sizes. In this article, we'll show you how to calibrate your computer screen to become an accurate virtual ruler.

To start, save the pixels per inch (PPI) of your device. This can vary depending on your device's brand and model. For example, my Sony Xperia C5 has a PPI of 122.6, while my OPPO R11 Plus also has the same PPI. Apple iPhone 5 has a PPI of 163, iPhone 7 has a PPI of 162, and iPhone X has a PPI of 151.7.

Once you have your device's PPI, you can adjust the default setting to match it. I found that my screen's markings were not very accurate when set at 30cm, so I adjusted the setting to 100.7 PPI for more accuracy.

To calibrate your virtual ruler, select a comparison item and use an actual ruler to measure its size. In my case, I used an A4-sized printable paper as a comparison object in my office. The 'ruler adjuster' feature helps you calibrate the accuracy more easily.

Once calibrated, you can compare any standard size object at your side, such as a coin, credit card, CD, paper money, or mobile phone. When you know the width of your object, you can adjust the ruler's PPI setting accordingly.

For example, if you want to measure the length of your paper money, simply search for 'the width of your paper money' online and use that information to adjust your virtual ruler. You can also use standard objects to compare lengths, such as checking your wallet or using a credit card as a comparison object.

I was lucky enough to find that my screen has a PPI of 100, which made it easy for me to calibrate the virtual ruler. If you're unsure about your device's PPI, you can search online for 'display by pixel density' and check if there are results for your device's brand and model.

In conclusion, using your computer screen as a virtual ruler is a simple and convenient way to measure lengths without relying on physical rulers. By following these steps and calibrating your screen with an actual ruler, you can have the most accurate virtual ruler online.

Mm actual size chart online