Paper Size Converter
Select a paper size like A4 or Legal and see its mm, cm and inch dimensions instantly.
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How to use
- Enter your value in the box above or select an option.
- The result updates live instantly — no button needed.
- Change the value or unit and the new result shows automatically.
Note
In the A series each size is half of the previous one — A5 is half of A4 and A3 is double. Letter and Legal are US sizes that differ from A4, so confirm the size before printing.
Frequently Asked Questions (FAQ)
What does the paper size converter do?
Select a paper size and instantly see its dimensions in mm, cm and inches.
Which paper sizes are included?
The A series from A0 to A8, B4, B5 and B6, plus US sizes Letter, Legal, Tabloid and Executive.
What are the dimensions of A4?
A4 is 210 by 297 millimeters, which is 21 by 29.7 centimeters or about 8.27 by 11.69 inches.
Are the dimensions exact?
Yes. The converter shows the standard published dimensions for each size in millimeters, centimeters and inches.