B series paper sizes (B0 to B10)
The B series sits between the A sizes and is common for books, posters and passports.
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How to use it
- Enter size, orientation and resolution.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Dimensions from the ISO 216 table in mm. Inches = mm ÷ 25.4, pixels = inches × DPI, rounded.
Example
Inputs: Size = B5, Orientation = Portrait, Resolution = 300 DPI. Result: Size in millimetres: 176 × 250 mm; Width: 17.6 cm; Height: 25 cm.
Limits and caveats
- These are ISO sizes; Japan uses a slightly larger JIS B series, for example JIS B5 is 182 × 257 mm.
Questions about this tool
What size is B5 paper?
ISO B5 is 176 × 250 mm, or 17.6 × 25 cm.
Is B4 bigger than A4?
Yes. B4 is 250 × 353 mm, between A4 and A3.
How are B sizes derived?
Each B size is the geometric mean of the two neighbouring A sizes, so B1 sits between A1 and A0.