B5 Paper is a paper size that measures 176 mm by 250 mm, which is approximately 6.9 inches by 9.8 inches. It is part of the A series of paper sizes defined by the ISO 216 standard, which is widely used in many countries around the world. B5 is often used for notebooks, planners, and various types of printed materials, providing a balance between portability and usability. The B5 size is larger than A5 but smaller than A4, making it a popular choice for those who need more writing space than A5 offers without the bulk of A4. This size is particularly favored in educational and office settings for its versatility and ease of handling.