letterformaat

Letterformaat refers to the standard sizes and dimensions used for paper, envelopes, and related materials in various regions, primarily in the Netherlands, Belgium, and parts of Germany. These formats are based on the ISO 216 international standard, which defines paper sizes in a modular system where each size is derived from the previous one by halving the area and adjusting the proportions. The most common letterformaat sizes include A4, A5, and A3, among others.

The A-series formats are widely used for documents, letters, and printed materials. An A4 sheet measures 210 millimeters by 297 millimeters, making it the most frequently used size for standard correspondence and printing. Smaller formats like A5 (148 x 210 mm) are often used for postcards or smaller documents, while larger sizes such as A3 (297 x 420 mm) are suitable for posters or presentations.

In addition to paper sizes, letterformaat also encompasses envelope dimensions designed to accommodate specific paper formats. For example, an A4 envelope is typically sized to hold an A4 sheet securely, ensuring proper alignment and protection during mailing. Envelopes are often labeled with their corresponding paper format, such as "A4" or "C4," where the latter refers to a larger envelope size used for thicker or folded materials.

The standardized nature of letterformaat ensures consistency in printing, mailing, and document handling across different industries and regions. This uniformity simplifies logistics, reduces errors, and promotes efficiency in both personal and professional settings. While the term is most commonly associated with Dutch-speaking countries, similar international standards (such as ISO 216) are used globally, making letterformaat a practical reference for anyone working with printed materials.