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Welcome to the dedicated cm ruler page, engineered for instant, sub-millimeter measurements in the metric system directly on your screen.
The metric system is the universal standard in science, engineering, and daily life worldwide. One centimeter equals exactly 10 millimeters.
On digital screens, each centimeter is rendered with 10 millimeter divisions and a highlighted 5 mm midpoint mark, computed using your display’s actual physical PPI.
Calculated using exact display pixel density.
Align objects with precision guidelines.
Place on top, bottom, left, or right edges.
Instant access in any modern browser.
To ensure your centimeters are physically identical to a real wooden or metal ruler, use our quick calibration with a standard payment card.