INCH RULER
Inch Ruler Online
A free online ruler in inches. Auto-detects your screen, or calibrate exactly with a card, then measure small objects directly on screen.
Rough estimate · 96.0 PPI — calibrate for real accuracy
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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
cm Ruler Online →Pixel (px) Ruler Online →mm Ruler Online →Ruler for iPhone →Ruler for Laptop Screen →
Frequently asked questions
How accurate is the inch reading?
Just like the cm version, accuracy depends on calibration — auto-detect is a good guess, and calibrating with a standard card gives an exact inch reading on any screen. Everything — detection, calibration and measuring — happens entirely in your browser. Nothing is uploaded.
Can I switch to cm or pixels?
Yes — tap cm or px at the top any time.