US Envelope Paper Sizes
Pre-ISO British sizes still used in bookbinding. Foolscap (203 × 330 mm), Quarto, Imperial.
US Envelope Paper Sizes — dimensions in mm and inches
| Format | mm | inches |
|---|---|---|
| Dukes | 140 × 178 | 5.51 × 7.01 |
| Kings | 165 × 203 | 6.5 × 7.99 |
| Imperial | 178 × 229 | 7.01 × 9.02 |
| Quarto | 203 × 254 | 7.99 × 10 |
| Foolscap | 203 × 330 | 7.99 × 12.99 |