A4 Paper Size & Dimensions
The A4 Paper is one of the most reliable reference objects for calibrating a screen ruler. With standard dimensions of 297mm x 210mm (29.7cm x 21.0cm / 11.69" x 8.27"), it provides a reliable size reference for screen calibration.
A4 Paper Exact Dimensions
Millimeters
297 x 210 mm
Centimeters
29.7 x 21.0 cm
Inches
11.69 x 8.27"
Standard A4 paper (ISO 216)
How to Calibrate with a A4 Paper
- Open the screen ruler on your device and select A4 Paper from the calibration panel.
- Place your a4 paper flat on the screen, aligning it with the on-screen outline.
- Adjust the calibration slider until the outline matches your a4 paper exactly.
- The calibration is saved automatically. You can now measure any object with the ruler and get accurate readings in centimeters, millimeters, and inches.
Why Use a A4 Paper for Calibration?
Calibration is essential because every screen has a different pixel density (PPI). A pixel on a 6-inch phone screen is physically much smaller than a pixel on a 27-inch desktop monitor. By placing a known-size object on the screen, the ruler can calculate the exact physical size of each pixel and convert measurements accurately.
The A4 Paper is an excellent calibration reference because its dimensions follow an international standard, making it consistent worldwide. Most people have one readily available.