Paper Size Converter

Paper size standards vary globally, with the ISO 216 series (A4, A3, etc.) used internationally and North American sizes (Letter, Legal) primarily in the US and Canada. Understanding these differences is crucial for international business, printing, and document formatting requirements.

The ISO A series follows a mathematical √2 ratio (1:1.414), meaning each size is exactly half the area of the next larger size when folded. A4 paper (210×297mm) is the global standard for documents, while A3 (297×420mm) serves for larger formats like posters and presentations.

North American standards include Letter size (8.5×11 inches) as the document standard, Legal size (8.5×14 inches) for legal documents, and Tabloid (11×17 inches) for larger prints. These sizes don't follow the √2 ratio, creating formatting challenges when converting between systems.

For international business, paper size compatibility affects document design, printing costs, and presentation formatting. A4 documents may not print properly on Letter-sized printers without scaling, potentially causing text cutoff or margin issues in professional communications.

Design and printing applications require precise paper size knowledge for optimal layouts. Graphic designers, architects, and engineers must consider paper dimensions when creating documents intended for international distribution, ensuring compatibility across different regional printing standards and reducing production complications.