Paper Sizes Reference

Complete reference for paper sizes — ISO A, B, C series, US, ANSI, Architectural, and Japanese JIS.

How to use

  1. Browse paper sizes by series or use the search box to filter by name or dimensions.
  2. Click any series tab (ISO A, ISO B, US, etc.) to jump to that section.
  3. Click any row to copy its dimensions to your clipboard.

Frequently asked questions

What is A4 paper size in inches?

A4 is 210 × 297 mm, which equals 8.27 × 11.69 inches.

What is the difference between A4 and US Letter?

A4 is 210 × 297 mm while US Letter is 215.9 × 279.4 mm (8.5 × 11 in). Letter is wider and shorter.

How does ISO paper sizing work?

ISO sizes use a 1:√2 aspect ratio. Each size is half the area of the next larger one, making scaling seamless.

What paper size is best for printing?

For documents, A4 (international) or Letter (US). For posters, A3 or Tabloid. For envelopes, use the matching C-series.

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