B paper sizes (ISO 216 B series) are larger alternatives to the A paper size series. B sizes are commonly used for posters, books, and passports, whereas the A series is more office-focused. The B series maintains the same 1:1.414 aspect ratio, with B0 starting at 1000 × 1414 mm and each subsequent size halving one dimension. Key sizes include B1 (707×1000mm), B2 (500×707mm), B4 (250×353mm), and B5 (176×250mm).
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