To use the translation page, click the "Translation Page" button below to open the translation page. For example, my Asus laptop is 100.7 PPI, Apple MacBook Air is 127.7 PPI, Xiaomi Mi Pad 3 is 163 PPI, my mobile phones (Sony Xperia C5, OPPO R11 Plus) are both 122.6, Apple iPhone 5 is 163 PPI, iPhone 7 is 162 PPI, and an iPhone X is 151.7 PPI. Each device has its own pixel density.So, I adjusted the default pixels per inch to 100.7 PPI and the virtual ruler is now accurate. After I measured the size of the virtual ruler with an actual ruler, I found that the measurements were not accurate by 30cm.Then search "the width of your paper money" online to use when calibrating the ruler setting via the adjuster. Check your wallet to use any paper money to compare to the object being measured.I got lucky and found that my screen has 100 pixels per inch. Search "display by pixel density" online.We can calculate this by dividing 1366 by 13.6 which equals 100.44. My laptop has a wide screen size of 13.6 x 7.6 inches and the resolution is 1366 x 768 pixels.I hope you found these free printable rulers useful! They are a quick and easy alternative for when you don’t have a physical ruler on hand.There are some ways to know the pixels per inch to your device. If you don’t just want a disposable ruler, you can easily laminate them or print them on thick cardstock to make them more durable. Just because these are paper rulers doesn’t mean they are a one-time-use ruler. You can use these centimeter and inch rulers for sewing projects too. ![]() Use a ruler print out at home or in your classroom to help kids and young children with their studies, math, craft activities, and much more. I recommend printing the paper rulers on a nice cardstock for sturdiness and durability. Click Properties and set the Page Size to Letter or A4 (depending on what paper you use).Make sure the Page Scaling is set to None.To print the paper rulers, there are a few print settings you will need to be aware of first.Īs accuracy is the key factor when printing these ruler templates, you will need to make sure your printer setup is correct for printing. Print Ruler 12 inches and 30 centimeters – A4 To save any of our printable paper rulers, simply click on the ruler you want and save it to your computer or click the PDF link underneath. See printing instructions below for help with printing correctly for accurate measurements. Printable RulersĮach ruler is available in both US letter and A4 sizes and comes as a PNG and PDF file. We have options for rulers to be printed then cut out, or folded options where you simply just print out then fold the page for an accurate ruler. You will find that our rulers have centimeters (cm) and millimeters (mm) on one side and inches (in) on the other side. Our printable rulers are actual size so if you’re looking for a metric ruler of 12-Inch or 30 centimeters then this is what you need. If you need an accurate ruler quickly then these rulers are free and easy to use. Our printable rulers follow the metric system so you will find a collection of standard rulers such as centimeter rulers and inch measurements. ![]() ![]() Just print for an accurate easy-to-use ruler whenever you need to measure something. Use this printable ruler to measure things when you don’t have a physical ruler available.
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