Ruler for iPhone
Turn your iPhone's screen into a real ruler. Pick your exact iPhone model for an accurate reading, or calibrate with a card.
Works best on a laptop or desktop with a mouse. On a phone, calibrate with a card or pick your exact model for the most accurate reading — auto-detect is a best guess.
Keyboard: C crosshair · A angle · D dark mode · F fullscreen · H hide controls · 1-4 units · Esc clear/close
More ruler units
Frequently asked questions
Which iPhone models does this support?
Several common models — SE/8, 12/13 mini, 12/13/14, Pro and Pro Max sizes, and 14/15/16 Pro — are listed with their known screen size. Tap Calibrate → Device and pick yours for an accurate reading.
What if my exact model isn't listed?
Use the Card tab instead — hold any standard credit or ID card up to the screen and match it to the on-screen bar for an exact calibration on any device. Everything — detection, calibration and measuring — happens entirely in your browser. Nothing is uploaded.
Is there an app to install?
No — it works directly in Safari or any browser, no app or download needed.