Height Ruler (iOS)

Height Ruler – Measure Height using your iPhone

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Download on the App Store

POC App – Discontinued

Developer: Wern
Latest Version: 1.0.1

Proof of Concept app to demonstrate the possibility of measuring height purely from air pressure differences, via the barometer of your device. No longer updated.


IMPORTANT! Please check if your device is supported before downloading.

Height Ruler is an app which uses your device’s barometer to detect air pressure changes and calculates an object’s height.

With Height Ruler, you can easily measure anything. For example, to measure your height, just place your phone on the floor, then on your head and back to the floor and this app will do the rest. Then, you will get your height in meters or feet and inches!

• Works with just your device!
• Easy to follow instructions.
• Measures height to a maximum accuracy of ± 8cm (± 3 inches).

Supported devices:
• iPhone 6
• iPhone 6 Plus
• iPhone 6s
• iPhone 6s Plus
• iPad Air 2
• iPad Mini 4
• iPad Pro 12.9 inch
• iPad Pro 9.7 inch


If you have any problems or want to seek further queries, please send a feedback at the application feedback page. You can be anonymous if you want.

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11 thoughts on “Height Ruler (iOS)”

  1. I tried to use the app on my Apple SE. No go. I then tried using the app on my iPad. I followed the directions exactly — and learned that I am 4″1′ tall.

  2. Was a waste of .99. It does not work. Unless my 5’6″ frame is now only 2’6″. Same goes for my son. Do not waste your money eh in this app like I did. Waste of time, and money.

    1. Hi Stephanie, sorry for your experience with the app.

      To prevent inaccuracies with the app, pls keep the device level flat (parallel to the ground) at all times, and don’t move it while measuring. A minor movement can cause the ambient air pressure to change and therefore reducing the inaccuracy of the app. This is because it is using the Barometer sensor of the phone which is very sensitive to minor changes in air pressure.

      You can also see the accuracy of your current measurement just below the result.
      In perfect conditions, you’ll get a maximum accuracy of 3 inches.

      Try measuring something stable, such as a table, as this makes sure the phone is parallel to the ground, and not moving, at all times. This will render extremely accurate results! ;)

      Hope this suggestion works!