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Accurately convert Japanese JIS standard paper sizes to pixels. Supports A and B series with custom DPI settings.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Select a listed Japanese JIS paper size and a resolution in dots per inch (DPI). The converter returns rounded width and height in pixels. Its default resolution is 300 DPI; the control accepts values from 72 through 600 DPI. These are theoretical pixel dimensions derived from the chosen physical size and resolution, not an image file or printer setup.
The calculation is pixels = (millimeters ÷ 25.4) × DPI, rounded to the nearest whole pixel for each side. For JIS B5, listed as 182 × 257 mm, at 300 DPI the unrounded dimensions are about 2150 × 3035 pixels, and the display rounds each dimension. Verify the result directly in the converter when exact rounding matters.
The B-series name alone is ambiguous: Japanese JIS B dimensions differ from ISO B dimensions. For example, JIS B5 measures 182 × 257 mm, while the commonly listed ISO B5 dimensions are 176 × 250 mm. The JDF specification errata lists the JIS B sizes separately from ISO B sizes, and Oracle’s Java documentation also identifies JIS B5 as 182 × 257 mm. See the JDF 1.6 JIS paper-size table and Oracle’s JIS B5 reference (checked September 29, 2026).
This page lists JIS B0 through JIS B12, plus Shiroku-ban and Kiku-ban. Choose the JIS entry explicitly when matching a Japanese paper or notebook size.
DPI specifies how many image dots correspond to one inch of physical length for this calculation. At a higher DPI, the pixel count increases while the selected paper’s physical dimensions stay the same. DPI is not a promise about a printer’s actual output quality or a file’s final appearance.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Select a named JIS size from the paper-size list. Check that the entry says JIS B if you are comparing it with another B-series standard.
Set a DPI value between 72 and 600. Preset values are available, or enter another whole-number resolution in the allowed range.
Read the width and height in pixels. Copy the values separately when preparing a canvas or image specification.
For a portrait JIS B5 sheet at 300 DPI, use 182 mm for width and 257 mm for height in the formula. A landscape layout swaps the orientation; it does not change the underlying size.
Use cases
See how the tool fits into real work and everyday tasks.
A designer can estimate a pixel canvas for a JIS-size page, select the intended DPI, and then create the canvas separately in an image editor.
A production team can compare pixel requirements for a JIS sheet at different resolutions before preparing artwork. Confirm final requirements with the printer.
A student or researcher can compare JIS B dimensions with an ISO B reference without assuming that both B5 labels mean the same physical sheet.
Q&A
Find concise answers to common questions and confusing cases.
No. The sources cited here give JIS B5 as 182 × 257 mm; the JIS and ISO B series use different dimensions.
The formula multiplies physical length in inches by dots per inch. Increasing DPI increases the pixel count without changing the selected sheet dimensions.
No. It calculates pixel width and height only. It does not create a canvas, add bleed or margins, or verify printer settings.
Notes
Review scope, result limitations, and important precautions before use.
Pixel dimensions are a calculation from nominal listed dimensions and the selected DPI. A print provider may specify bleed, safe area, color settings, or other production requirements that this converter does not check. Verify the size label and resolution expected by your actual workflow.
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