Convenient ruler on screen
This is an online virtual ruler, it could be adjusted to an actual size, and has both metric and imperial scale units, before you use it, please set the pixels per inch to your own device. This is useful to me and welcome to share it or use it.
Adjusting this virtual ruler toto actual size
There are some ways to know the pixels per inch to your device.
- My laptop has a wide screen, size 13.6x7.6 inches, and resolution is 1366x768 pixels, we can calculate this, 1366 divided by 13.6 is 100.44, so the pixels per inch is 100.44
- Search "display by pixel density" online, i am lucky and found my screen has 100 pixels per inch.
- Check your wallet, use any paper money to be our compare object, then search "the width of your paper money" online, when you know the width, you can calibrate the ruler setting via adjuster.
- The most accurate way, after i measure the size of virtual ruler by an actual ruler, i found the markings are not very accurate at 30cm, so i adjust the default pixels per inch to 100.7, now i get an online actual size ruler.
How to use your computer screen as a ruler?
All you need is a web browser and a credit card to compare physical sizes, no installation required, free to use, and works on your phone screen as well.
Compare ruler with credit card
Dragging ruler adjuster left or right to fit the size of the reference, remember to save the setting for next time, after save the setting, refresh your brower to check the result. On the most popular browsers you can press the F5 key or click on the refresh button.
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Share to your good friends
Welcome to share this online ruler to your friends, if you do like it.
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Length Unit Converters
- Convert Centimeter or Millimeter to Inches : convert millimeter to inches, centimeter to inches, inches to centimeter or millimeter, include convert decimal inch to fractional inch (for example 1.45" = 1 7/16").
- Convert Meters to Feet : convert meters to feet and inches, or convert feet and inches to meters.
- Convert Yards to Meters : yards and meter converter, convert yards to meters, or meters to yards.
- Convert Centimeter to Millimeter : millimeter and centimeter converter, convert millimeter to centimeter, or centimeter to millimeter.