A1 paper size is a standard paper size used widely in many parts of the world, particularly in Europe and Asia. It measures 594 x 841mm (23.4 x 33.1 inches) and is the second largest of the A series paper sizes, after A0.
A1 paper size is commonly used for printing posters, large photographs, architectural drawings, and technical diagrams. It provides ample space for detailed designs and complex graphics, making it an ideal choice for professionals such as architects, engineers, graphic designers, and artists. A1 paper size is also frequently used in educational settings, such as for classroom posters or presentations, as it offers enough space to display information to a large audience.
Like all other A series paper sizes, A1 paper size is based on a simple principle: each size is half the area of the next size up, with the longest side being exactly one and a half times the length of the shorter side. This means that two A1 sheets can be placed side-by-side to create an A0 sheet, or two A2 sheets can be placed side-by-side to create an A1 sheet, and so on. This makes it easy to scale documents up or down without losing their proportions.