B10

The B10 paper size is an extra-small format that is part of the ISO B series used for highly specialized printing applications and ultra-compact documents. With miniscule dimensions of 31 x 44 mm, B10 is even smaller than the standard B9 size. It maintains the characteristic height-to-width ratio of 1:√2 (approximately 1:1.4142) that enables consistent scaling down the B system.

With a microscopic surface area of just 0.0014 square meters, B10 provides an extremely space-saving print area optimized for maximum portability. Its tiny size is suitable for small index cards, mini charts, pocket notes, and specialized prints needing the ultimate compact format. While not an officially defined ISO standard, B10 naturally extends the incremental scaling of the B series for niche contexts requiring an extra-small paper size. It offers a functionally diminutive format for portable technical documents and micro-visual information when even B9 is too big.