iPad Screen Ruler
This page provides a ruler calibrated specifically for the iPad. The iPad has a 10.2-inch display with a pixel density of 264 PPI (pixels per inch), which translates to approximately 104 pixels per centimeter. Use the ruler above to measure real-world objects directly on your iPad screen with accuracy within 0.5mm after calibration.
iPad Display Specifications
Screen Size
10.2"
Pixel Density
264 PPI
Device Type
tablet
Pixels per CM
104
How to Measure on Your iPad
- Open the ruler on your iPad using any web browser (Safari, Chrome, or Firefox all work).
- Calibrate by placing a credit card or known-size object on the screen and adjusting the calibration slider until the on-screen outline matches the object exactly.
- Measure by placing any object against the ruler markings. The ruler displays centimeters, millimeters, and inches simultaneously.
- Your calibration is saved automatically in your browser for 30 days, so the ruler stays accurate on return visits.
Why PPI Matters for Screen Measurement
PPI (Pixels Per Inch) determines how large each pixel appears on your screen. The iPad's 264 PPI means 264 tiny dots fit within one physical inch of screen space. A higher PPI means smaller pixels, sharper text, and more precise ruler markings.
For comparison, a typical desktop monitor has around 96 PPI, while the iPad at 264 PPI offers 2.8x the pixel density. This higher density allows the on-screen ruler to display finer graduation marks and more accurate measurements.