What Dimensions B5: Exact Paper Size Guide

What is B5 size?

B5 is a member of the ISO 216 family and, like the A-series, follows the √2 aspect ratio to maintain proportional scaling across sizes. According to What Dimensions, B5 provides a compact yet comfortable writing surface, making it a popular choice for portable notebooks, travel planners, and compact reports. The B-series is designed to balance readability with space efficiency, and B5 sits neatly between A4 and A5 in terms of overall area. In practice, designers and students often select B5 when they want more room than A5 but less bulk than A4. The standardization ensures consistent printing and folding behavior across devices and environments.

Exact dimensions of B5 (mm) and inches

B5 measures 176 millimeters in width and 250 millimeters in height, which converts to about 6.93 inches by 9.84 inches. The ISO 216 standard defines this size so that printers, binders, and folders can align across products. The slight variation in orientation (landscape vs portrait) does not change the fundamental dimensions; it only alters how the paper is loaded or viewed. For practical purposes, when you print, set your margins to accommodate the 176 × 250 mm footprint and verify printer margins to avoid clipping.

B5 vs A4 and A5: quick comparison

• A4: 210 × 297 mm (8.27 × 11.69 in) – larger than B5, widely used for letters and documents.
• A5: 148 × 210 mm (5.83 × 8.27 in) – noticeably smaller than B5, common for pocket notebooks.
• B5: 176 × 250 mm (6.93 × 9.84 in) – sits between A4 and A5 in area and feel.

In terms of area, B5 is roughly 0.7 of A4’s area, offering more writing space than A5 while remaining more portable than A4. The aspect ratio remains consistent across sizes in the ISO family, which helps with scaling artwork and layout planning.

Common uses for B5 in notebooks, planners, and printing

B5 is a favorite for personal planners, neutral-tone notebooks, compact reports, and travel journals. Its dimensions strike a balance between ample writing space and portability, making it ideal for students and professionals who carry a notebook in a bag. For printing, B5 sheets fit many office printers with regular margins, but always check your printer’s supported paper sizes and adjust margins accordingly. Designers often pair B5 with thin notebooks, binder sleeves, and compact file folders for an organized workflow.

Practical tips for printing with B5: margins, alignment, and folding

• When printing, verify your printer’s available paper sizes and set the page size to B5 or custom dimensions (176 × 250 mm).
• Use modest margins (e.g., 10–15 mm) to maximize writing area without risking content clipping.
• If folding, ensure the fold lines align with the 176 mm dimension for consistent pages per signature.
• For binding or inserting into organizers, confirm the binder rings or binder width accommodates B5 sheets without causing crowding.

Converting B5 to inches and understanding conversions

Conversions use 1 inch equals 25.4 millimeters. Therefore, 176 mm ≈ 6.93 inches and 250 mm ≈ 9.84 inches. When planning layouts or templates, always convert both dimensions for accurate print previews and for sharing with collaborators who use inches. For precision work, consider using a ruler or a digital design tool that supports ISO dimensions to preserve proportions.

Storage and care: preserving B5 sheets and notebooks

Store B5 sheets flat in a dry environment to prevent warping. If you use a ring binder, ensure rings support the 176 × 250 mm format. Protect pages from creases by using evenly sized folders or sleeves. If you print on both sides, consider bleed areas so content remains clean in portrait orientation. Proper storage helps maintain consistent margins and readability for the long term.