A normal piece of paper is typically the size known as A4, which measures 210 × 297 millimeters (8.3 × 11.7 inches). This is the most common paper size used internationally for letters, documents, and printing. In North America, a standard piece of paper is often the "Letter" size, which measures 8.5 × 11 inches (216 × 279 millimeters).

Common Paper Sizes

Paper Size| Dimensions (mm)| Dimensions (inches)
---|---|---
A4| 210 × 297| 8.3 × 11.7
Letter| 216 × 279| 8.5 × 11

The A4 size is part of the international A-series paper sizes, standardized for consistent usage globally, while the Letter size is mainly used in the US and Canada.