About A4Size.uk

A4Size.uk is a free online reference for paper sizes, unit conversions, and printing dimensions. Every size listed on this site is verified against official international standards including ISO 216, ISO 269, ANSI/ASME Y14.1, JIS, DIN, and others.

What We Cover

ISO A, B, and C series (A4, A3, C4 envelopes, etc.)
US ANSI and Architectural sizes (Letter, Legal, Tabloid, Arch A–E)
US and International envelopes (#10, DL, C5, etc.)
Photography print sizes (2R through 11R)
Raw print stock (RA, SRA)
Japanese, Chinese, Canadian, Swedish, French, and British traditional formats
Book, newspaper, billboard, and business card sizes
German DIN sizes and UK-specific paper standards

All Units Supported

Every paper size on this site is listed with conversions in 30+ units:

Metric: nanometers (nm), micrometers (µm), millimeters (mm), centimeters (cm), decimeters (dm), meters (m), kilometers (km)
Imperial: inches (in), feet (ft), yards (yd), miles (mi), nautical miles (nmi), hands, barleycorns
Typography: PostScript points (pt), picas (pc), twips, Didot points, Didot picas, ciceros
Digital: CSS pixels, pixels at 72, 96, 150, 300, 600, and 1200 PPI
Relative: em, en (12pt base)

Free Tools

Paper Size Converter — convert any dimension between all 30+ units
Size Comparison Tool — compare any two paper sizes visually

Our Commitment

All dimensions come from official standards and are cross-verified against multiple industry references. If you spot any inaccuracy, please contact us — accuracy is our top priority.

Privacy

We do not collect personal information. All conversions happen in your browser. See our Privacy Policy for full details.