Screen Rulers by Device
Pick your device for a pre-calibrated ruler that accounts for your screen's PPI automatically. Every screen has a different pixel density — a 1 cm line on an iPhone is a different number of pixels than on an iPad. These device pages skip calibration and show an accurate ruler instantly.
Don't see your device? Use the general screen ruler and calibrate with a credit card.
How device-specific rulers work
Each device page uses the manufacturer's published PPI (pixels per inch) and screen resolution to render a ruler at true physical size. No manual calibration needed — just open the page on the matching device. If you're on a different screen than the one listed, the ruler falls back to credit-card calibration for the same accuracy.
Open general ruler →Browse the full Device Specs Database →Apple iPhone
iPhone 17 Pro Max
6.9" screen · 460 PPI
iPhone 17 Pro
6.3" screen · 460 PPI
iPhone Air
6.5" screen · 460 PPI
iPhone 17
6.3" screen · 460 PPI
iPhone 16 Pro Max
6.9" screen · 460 PPI
iPhone 16 Pro
6.3" screen · 460 PPI
iPhone 16 Plus
6.7" screen · 460 PPI
iPhone 16
6.1" screen · 460 PPI
iPhone 15 Pro Max
6.7" screen · 460 PPI
iPhone 15 Pro
6.1" screen · 460 PPI
iPhone 15
6.1" screen · 460 PPI
iPhone 14 Pro Max
6.7" screen · 460 PPI
iPhone 14
6.1" screen · 460 PPI
Apple iPad
Samsung Galaxy
Other Android
Pixel 10 Pro XL
6.8" screen · 486 PPI
Pixel 9 Pro XL
6.8" screen · 486 PPI
Pixel 9 Pro
6.3" screen · 495 PPI
Pixel 9
6.3" screen · 422 PPI
Xiaomi 15 Ultra
6.73" screen · 522 PPI
Xiaomi 15
6.36" screen · 460 PPI
OnePlus 13
6.82" screen · 510 PPI
OPPO Find X8 Pro
6.78" screen · 450 PPI
Xiaomi Redmi Note 13
6.67" screen · 395 PPI