ISO 216 is the international standard for paper sizes, and includes sizes such as A4, A3, etc. Here is a list some the A, B and C series sizes, and also some common US paper sizes.
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US paper sizes
| Size | millimeters | inches |
|---|---|---|
| Letter | 216mm x 279mm | 8.5" x 11" |
| Legal | 216mm x 356mm | 8.5" x 14" |
| Junior Legal | 203mm x 127mm | 8" x 5" |
| Ledger | 432mm x 279mm | 17" x 11" |
| Tabloid | 279mm x 432mm | 11" x 17" |