Actual Size Ruler

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Graduation of an inch: ", , PPI :

Handy Online Ruler

This is a convenient online ruler that could be calibrated to actual size, measurements in cm, mm and inch. In order to accurately measure the length of your item, we strongly recommend that you calibrate the ruler first, 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 to actual size

There are some ways to know the pixels per inch(PPI) to your device.
  1. My laptop has a wide screen (13.6"x7.6"), and resolution is 1366x768 pixels, 1366 / 13.6 = 100.44 PPI. Screen resolution of current device is pixels.
  2. Search "display by pixel density" online, check if there has your device's brand and model, i am lucky and found my screen has 100 PPI.
  3. Use standard objects to compare lengths, 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 adjust the ruler's PPI setting by it, you can compare to any standard object, the longer the more accurate.
  4. 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(PPI) to 100.7, now i get an online actual size ruler.
  5. Each device has it's own PPI, eg. my laptop is 100.7 PPI, my mobile phones (Sony Xperia C5, OPPO R11 Plus) are both 122.6 PPI, Xiaomi Mi Pad 3 is 163 PPI. sorry, I don't have an iPhone to test for you, too expensive to me 😛

Save the pixels per inch (PPI) according your own device, then you can use this ruler next time.
Pixels per inch : , show ruler adjuster

Dragging ruler adjuster left or right to fit the size of your reference object, 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.

Translate into your native language

Are you willing to offer a native language version for your country ? We are looking for volunteer to improve the content in your native language, if you are interested to help this, please visit this translation page. Below are some other language version.

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Could not find a real ruler on your desktop ? try this virtual screen ruler.

Length Unit Converters

How to use a ruler

This ruler measure in two different units of length, inches on one side (English ruler) and centimeters on the other side (metric ruler). A metric ruler is use to measure centimeter(cm) and millimeter(mm), the centimeter is a unit of length in the International System of Units; An English ruler provides incremental measurements in inches, with each inch further divided into smaller fractions.

Read an English ruler using fractions of an inch. The distance between any two large numbered lines is 1 inch. The large unnumbered line that is halfway between them is 1/2 inch. The smaller (but still prominent) line between the 1/2 mark and the numbered inch line is 1/4 inch. The tiny little lines between all of the more prominent lines are 1/16 inch.

Observe the much simpler metric rulers. The distance between any two large numbered lines is 1 cm. The prominent line between any two numbered lines is 1/2 cm. The small lines between the 1/2 mark and the numbered centimeter mark are 1/10 cm, otherwise known as a millimeter.

Record distances by the name of the line that it most closely matches. If the length of an object goes to one mark past the halfway mark on your ruler then it will be 9/16 inch on an English ruler or 6/10 cm (or 6 mm) on a metric ruler.

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