(4 stars)


Download for Android Like

100,000 - 500,000 downloads

Add this app to your lists
Photo Ruler is designed to accurately determine the size of any object by either taking a picture of it or measuring it on the screen. With its simple user-friendly design Photo Ruler allows you to measure things just as conveniently and precisely as with a traditional ruler or tape measure.

How to use:

Method 1:

Firstly, please ensure that the object you wish to measure and the object of known length (Base Item) are in the same picture. Double tap on screen to call settings. There is a predefined list of Base Items, including Debit/credit card and Quarter. Select the one you have. It is advised to use the Base Item which is closest in size to the object you wish to measure.

Secondly, ensure that the Base Item and the object you wish to measure are in the same plane and the camera is (or was) parallel to them. This is necessary to avoid image distortions caused by the camera perspective.

Align the Blue arrows against the Base item and Green arrows against the object you want to measure. The length of the object is shown in the top left corner of the screen.

Method 2:

Use screen as a traditional ruler. You can measure size of a small object by placing it on the device's screen and adjusting line limiters against the object. The size of the object will be show at the bottom of the screen automatically. If you see that ruler’s scale is visually stretched/ shrunken, you can reset calibration manually. On-screen ruler can be calibrated using different Base Items, including Debit/credit card or coin. Double tap on screen to call settings.

Given that you have accurately aligned markers, you will receive a measurement that is as precise as when using a traditional ruler or tape measure.

Tags: photo ruler, ruler free.

Recently changed in this version

* Settings button
* Minor bug fixes

Comments and ratings for Ruler
  • (64 stars)

    by Lukas Frejka on 13/05/2015

    Docela v pohodě

  • (64 stars)

    by tina brough on 13/05/2015

    Good gadget and easy to use

  • (64 stars)

    by dean ariyanto on 10/05/2015


  • (64 stars)

    by Amit Karuna on 07/05/2015

    I like this app. I take measurement using camera and this app. It does open other advertisement in the background like Monster game. I do not like this so I rated this as 4.

  • (64 stars)

    by Qais Shaikh on 05/05/2015

    fake dont download asks for debit card always

  • (64 stars)

    by Filip Borelli on 04/05/2015

    Easy, useful, on my phone :*)

  • (64 stars)

    by Daniel Colliver on 04/05/2015

    Just a comparison to your credit card, not a photo ruler. Im not likely to allow an app. to have photos of my credit card lol. Good one!

More comments