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📏 On-Screen Ruler & Pixel-to-Physical Converter

📏 On-Screen Ruler & Pixel-to-Physical Converter

Turn your screen into a ruler. Calibrate once with a bank card (85.6 mm wide) or by entering your screen's diagonal size, then measure real objects in mm, cm and inches — and convert between CSS pixels, physical pixels, points, mm and inches for design work.

Step 1 — calibrate
BANK CARD · 85.60 mm
Step 2 — measure (drag on the ruler, or use the box)
Drag to measure
Resizable measuring box
drag corner ↘
Unit converter (uses your calibration)

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