Smart Ruler: Measure Tool

Ruler is a free, accurate ruler and measuring tape app. Measure length, distance, and objects in cm, mm, and inch right on your screen.

📏 Screen ruler & tape measure — clear markings in cm / mm / inch.

🔧 Calibrate with a credit card (85.6 mm) for precise measurement.

📐 Angle & protractor mode for DIY, crafts, and school.

▦ Area measurement for rooms and surfaces.

🌍 15 languages supported.

English, Spanish, Portuguese, German, French, Japanese, Korean, Italian, Chinese (Simplified), Chinese (Traditional), Turkish, Hindi, Indonesian, Vietnamese, Thai.

The simplest pocket ruler, tape measure, angle, and area measuring app —

always with you.