Paper Size Converter
Convert ISO A and B series paper sizes and US Letter, Legal, and Tabloid between millimetres, inches, points, and pixels at any DPI. Includes a full reference table of standard dimensions.
Millimetres
210.0 × 297.0 mm
Inches
8.27 × 11.69 in
Points (1/72")
595 × 842 pt
Pixels @ 96 DPI
794 × 1123 px
How to use the paper size converter
Pick a standard paper size; dimensions appear in millimetres, inches, points (PostScript / PDF), and pixels at 96 DPI.
Formula & explanation
ISO A series follows √2 ratio: each next size halves the larger dimension. A0 = 1 m². Inches → mm × 25.4. Points → in × 72.
Examples
A4 = 210 × 297 mm = 8.27 × 11.69 in = 595 × 842 pt. US Letter = 8.5 × 11 in = 215.9 × 279.4 mm.
Frequently asked questions
- Why is A4 not the same as Letter?
- Different historical standards — ISO A4 originated from a German DIN proposal in 1922 (1 m² area, √2 ratio); US Letter has murkier origins, possibly from a 17th-century Dutch papermaking convention.
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