Practical Applications & Tips
Measure Small Physical Objects
Measure jewelry, screws, coins, stamps, or craft materials directly against your screen.
School & Homework Projects
Handy virtual ruler when you don't have a physical plastic ruler nearby.
Frequently Asked Questions
Is this centimeter ruler accurate to actual size?
Yes! The ruler detects your screen's physical DPI and allows 1-click calibration with any standard credit card or gift card to guarantee exact 1:1 scale.