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Convert physical dimensions of ISO 216 standard paper sizes (A0-A13) to pixel values at a specified DPI/PPI for design, printing, and screen adaptation.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
A paper size is a physical width and height. Pixels describe a raster image, so an A4 sheet does not have one fixed pixel size without a chosen resolution. This converter selects an A-series sheet size and a DPI value, then calculates each pixel dimension from the physical millimeter measurement:
pixels = millimeters ÷ 25.4 × DPIHere, 25.4 millimeters equal one inch, and DPI means dots per inch for the intended output resolution. Each calculated dimension is rounded to the nearest whole pixel. ISO 216 specifies the trimmed A and B paper series; A4 measures 210 × 297 mm. [ISO 216:2007 covers A-series trimmed paper sizes and remains current; NIST states the exact inch conversion; checked 2026-09-28.]
At 300 DPI, A4 calculates to about 2480 × 3508 px in portrait orientation: 210 ÷ 25.4 × 300 rounds to 2480, and 297 ÷ 25.4 × 300 rounds to 3508. At 96 DPI the rounded dimensions are 794 × 1123 px. The same sheet therefore has different pixel dimensions at different DPI values.
A4 is an ISO paper size and is not the same physical sheet as US Letter. Select the correct paper standard for the job before using a pixel result. This page’s A-series choices run from 4A0 and 2A0 through A10.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Select the paper size, such as A4. The list includes oversize 4A0 and 2A0, regular A sizes, and smaller sheets through A10.
Move the DPI control or enter a value. The control supports 72 to 600 DPI; common preset values include 72, 96, 150, 300, and 600.
The result shows rounded pixel dimensions for the selected size and resolution. Use the dimensions in the same orientation as the listed paper size.
The page can share the selected size and DPI. Confirm those settings match the receiving design, document, or print workflow.
Use cases
See how the tool fits into real work and everyday tasks.
Set the exact paper series and the output resolution required by a document workflow, then use the resulting canvas dimensions as a starting point.
Compare one sheet at two DPI settings to show why physical size alone does not determine pixel count.
Check the sheet size and requested resolution before passing pixel dimensions to a printer or design teammate. Ask about bleed and printable margins separately.
Q&A
Find concise answers to common questions and confusing cases.
Using the listed A4 dimensions of 210 × 297 mm and rounding each result to a whole pixel gives 2480 × 3508 px.
The conversion multiplies the physical size in inches by DPI. A larger DPI value produces more pixels across the same physical sheet.
No. A4 belongs to the ISO A series; US Letter is a different paper size. Choose the size standard required by the recipient.
Notes
Review scope, result limitations, and important precautions before use.
The output is rounded to whole pixels and does not account for bleed, printer margins, scaling, or required image quality.
Changing a DPI setting in a calculation does not by itself add detail to an existing image. Check the receiving application or printer requirements before preparing final artwork.
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