Paper size reference

Paper sizes differ around the world. Most countries use the ISO 216 A series, with A4 as the standard office sheet, while the United States and Canada use Letter and Legal. This reference lists the exact dimensions of common paper and envelope sizes so you can set up documents, print layouts and designs correctly.

ISO A series

• A0: 841 × 1189 mm
• A1: 594 × 841 mm
• A2: 420 × 594 mm
• A3: 297 × 420 mm
• A4: 210 × 297 mm (8.27 × 11.69 in)
• A5: 148 × 210 mm
• A6: 105 × 148 mm (postcard)

US sizes

• Letter: 8.5 × 11 in (216 × 279 mm)
• Legal: 8.5 × 14 in (216 × 356 mm)
• Tabloid / Ledger: 11 × 17 in (279 × 432 mm)

How the A series works

A0 has an area of exactly one square metre, and every sheet has the aspect ratio 1:√2 (about 1:1.414). Cutting a sheet in half along its long side gives the next size with the same proportions: two A4 sheets make one A3. That is why enlarging A4 to A3 on a copier is exactly 141%. The B series sits between A sizes, and C sizes are envelopes that fit the matching A sheet: an A4 sheet fits flat in a C4 envelope (229 × 324 mm).

Print resolution

At 300 DPI, A4 is 2480 × 3508 pixels and Letter is 2550 × 3300 pixels. Use these when exporting print-ready images.

Common envelopes

• DL: 110 × 220 mm, fits A4 folded in thirds.
• C5: 162 × 229 mm, fits A4 folded once.
• US #10: 4.125 × 9.5 in, fits Letter folded in thirds.