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Quickly convert standard B series paper sizes (B0-B10) to pixel values based on your specified DPI/PPI. Ideal for digital design and print layout.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This calculator covers the ISO B series from B0 through B10. Choose a size and a resolution value to see its stored width and height in millimeters and the corresponding whole-pixel dimensions. In the United States, many everyday print jobs use Letter or Legal paper; those are different size families and are not part of this B-series selection. The similarly named Japanese JIS B series also uses different dimensions.
For a selected physical width or height, the calculation is:
pixels = round((millimeters ÷ 25.4) × DPI)
The 25.4 factor converts millimeters to inches. DPI is the number of image dots assigned per inch for this calculation. For B5, the listed size is 176 × 250 mm. At 300 DPI, 176 ÷ 25.4 × 300 = 2078.74, and 250 ÷ 25.4 × 300 = 2952.76; rounding each dimension gives 2079 × 2953 pixels.
A sheet’s physical dimensions stay the same as you change DPI, but the calculated pixel grid grows in proportion to the selected value. The tool starts at 300 DPI and offers a slider from 72 to 600, with common presets such as 96, 150, and 300. A higher pixel count describes a denser raster for the chosen physical size; it does not add detail to an image that was originally created at a lower resolution.
Choose B0–B10 from the paper-size list. The width and height are shown in portrait orientation in millimeters.
Move the DPI slider, choose a preset, or enter a number. The displayed pixel dimensions recalculate from the selected physical size and DPI.
Use the width and height values separately when setting up a canvas. If your layout is landscape, swap the two dimensions in your design application.
Use the pixel result to set an initial raster canvas or compare an export against a requested size. Confirm the required paper standard, orientation, resolution, bleed, and output settings with the print provider. A pixel calculation alone cannot determine whether the image content is sharp enough or whether a file is print-ready.
Use cases
See how the tool fits into real work and everyday tasks.
Set B5 and the resolution requested by the print workflow, then use the width and height as the raster canvas dimensions. The 300 DPI example yields 2079 × 2953 pixels.
Keep the paper size fixed and change DPI to see how the pixel grid changes. This helps communicate export dimensions to a designer while keeping the physical sheet size constant.
Notes
Review scope, result limitations, and important precautions before use.
This page calculates ISO B0–B10 sizes only. It does not calculate U.S. Letter or Legal sizes, and its B dimensions are not the JIS B dimensions used in Japan. Confirm which paper standard the receiving printer or document specification expects.
The output is a theoretical whole-pixel raster size. Width and height are rounded independently to the nearest integer, so a tiny aspect-ratio difference is possible. The result does not assess image quality, printer capability, bleed, color settings, or finishing requirements; verify those separately with the print provider.
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