Online Ruler
Measure Real-World Size, Right From Your Screen.
What is Online Ruler?
RulerGo is a free, browser-based ruler, caliper, and protractor — calibrated to your screen's real pixel density instead of the usual 96-PPI guess every "online ruler" defaults to. Calibrate once (auto-detect, your device model, screen size, or a credit card) and every measurement afterward is accurate to real-world inches, cm, and mm. No install, no signup, no ads.
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