| Size | Dimensions |
|---|---|
| A-2 | 4 3⁄8 inches by 5 5⁄8 inches |
| A-6 | 4¾ inches by 6½ inches |
| A-7 | 5¼ inches by 7¼ inches |
| A-8 | 5½ inches by 8 1⁄8 inches |
| A-9 | 5¾ inches by 8¾ inches |
| A-10 | 6¼ inches by 9 5⁄8 inches |
| A-Long or Slim | 3 7⁄8 inches by 8 7⁄8 inches |

Pointed flap on long dimension, diagonal seams.
| Size | Dimensions |
|---|---|
| 2 bar | 3 3⁄16 inches by 4¼ inches |
| 4 bar | 3 5⁄8 inches by 4 5⁄8
inches (some say, by 5 1⁄8 inches) |
| 5 bar | 4 1⁄8 inches by 5 1⁄8
inches (some say, by 5½ or 5 5⁄8 inches) |
| 5¼ bar | 4¼ inches by 5¼ inches |
| 5½ bar | 4 3⁄8 inches by 5 5⁄8
inches (some say, by 5¾ inches) |
| 5¾ bar | 4½ inches by 5¾ inches |
| 6 bar | 5 inches by 6 inches (some say, 4¾ inches by 6½ inches) |
| LEE | 5¼ inches by 7¼ inches |

| Size | Dimensions |
|---|---|
| 6¼ | 3½ inches by 6 inches |
| 6½ | 3½ inches by 6¼ inches |
| 6¾ | 3 5⁄8 inches by 6½ inches |
| 7 | 3¾ inches by 6¾ inches |
| 7¾ | 3 7⁄8 inches by 7½ inches |
| 8 | 3 7⁄8 inches by 7½ inches |
| 9 | 3 7⁄8 inches by 8 7⁄8 inches |
| 10 | 4 1⁄8 inches by 9½ inches |
| 10½ | 4½ inches by 9½ inches |
| 11 | 4½ inches by 10 3⁄8 inches |
| 12 | 4¾ inches by 11 inches |
| 14 | 5 inches by 11½ inches |
| Monarch | 3 3⁄8 inches by 7½ inches |
| Check | 3 5⁄8 inches by 8 5⁄8 inches |

| Size | Dimensions |
|---|---|
| 3 | 4¾ inches by 6½ inches |
| 4½ | 5½ inches by 7½ inches |
| 5 | 5½ inches by 8½ inches |
| 6 | 5¾ inches by 8 7/8 inches |
| 6½ | 6 inches by 9 inches |
| 6 5⁄8 | 6 inches by 9½ inches |
| 6¾ | 6½ inches by 9½ inches |
| 7 | 6¼ inches by 9 5⁄8 inches |
| 7¼ | 7 inches by 10 inches |
| 7½ | 7½ inches by 10½ inches |
| 9 | 8¾ inches by 11½ inches |
| 9½ | 9 inches by 12 inches |
| 10 | 9½ inches by 12 5⁄8 inches |
| 13 | 10 inches by 13 inches |

Made of heavy paper: kraft or manila. Notice that the dimensions do not always increase with the size number, for example, #14 is bigger than #15.
| Size | Dimensions |
|---|---|
| 0 | 2¼ inches by 4¼ inches |
| 5 | 3 1⁄8 inches by 5½ inch |
| 9½ | 4 1⁄8 inches by 9½ inches |
| 10 | 3 3⁄8 inches by 6 inches |
| 11 | 4½ inch by 10 3⁄8 inches |
| 14 | 5 inches by 11½ inches |
| 15 | 4 inches by 6 3⁄8 inches |
| 25 | 4 5⁄8 inches by 6¾ inches |
| 35 | 5 inches by 7½ inches |
| 50 | 5½ inches by 8¼ inches |
| 55 | 6 inches by 9 inches |
| 63 | 6½ inches by 9½ inches |
| 68 | 7 inches by 10 inches |
| 75 | 7½ inches by 10½ inches |
| 80 | 8 inches by 11 inches |
| 83 | 8½ inches by 11½ inches |
| 87 | 8¾ inch by 11¼ inches |
| 90 | 9 inches by 12 inches |
| 93 | 9½ inches by 12½ inches |
| 94 | 9¼ inches by 14½ inches |
| 95 | 10 inches by 12 inches |
| 97 | 10 inches by 13 inches |
| 98 | 10 inches by 15 inches |
| 105 | 11½ inches by 14½ inches |
| 110 | 12 inches by 15½ inches |

Flap on the short dimension, bottom seam, usually a center seam, but sometimes a single side seam.
| Size | Dimensions |
|---|---|
| 1 | 6 inches by 9 inches |
| 1¾ | 6½ inches by 9½ inches |
| 2 | 6½ inches by 10 inches |
| 3 | 7 inches by 10 inches |
| 6 | 7½ inches by 10½ inches |
| 7 | 8 inches by 11 inches |
| 8 | 8¼ inches by 11¼ inches |
| 9½ | 8½ inches by 10½ inches |
| 9¾ | 8¾ inches by 11¼ inches |
| 10½ | 9 inches by 12 inches |
| 12½ | 9½ inches by 12½ inches |
| 13½ | 10 inches by 13 inches |
| 14¼ | 11¼ inches by 1¼ inches |
| 14½ | 11½ inches by 14½ inches |
| 15 | 10 inches by 15 inches |
| 15½ | 12 inches by 15½ inches |
Hug flap along the long dimension, suitable for printing a large amount of copy. The flap is sometimes perforated. Two side seams.
| Size | Dimensions |
|---|---|
| 6¼ | 3½ inches by 6 inches |
| 6½ | 3½ inches by 6¼ inches |
| 6¾ | 3 5⁄8 inches by 6½ inches |
| 3 | 3½ inches by 6½ inches |
| 9 | 3 7⁄8 inches by 8 7⁄8 inch |
| 10 | 4 1⁄8 inches by 9½ inches |
| Size | Dimensions |
|---|---|
| 3 | 1 15⁄16 inches by 4 7⁄16 inches |
Rounded flap on longest dimension, diagonal seams.
| Size | Dimensions |
|---|---|
| 1 | 1¾ inches by 2 7⁄8 inches |
| 3 | 2 5⁄16 inches by 3 5⁄8 inches |
Flap on the short dimension, bottom seam, center seam. The long shape accommodates an insurance policy securely.
| Size | Dimensions |
|---|---|
| 9 | 4 inches by 9 inches |
| 10 | 4 1⁄8 inches by 9½ inches |
| 11 | 4½ inches by 10 3⁄8 inches |
| 12 | 4¾ inches by 10 7⁄8 inches |
| 14 | 5 inches by 11½ inches |

Flap on short dimension, center seam, bottom seam.
| Size | Dimensions |
|---|---|
| 1 | 2¼ inches by 3½ inches |
| 3 | 2½ inches by 4¼ inches |
| 4 | 3 inches by 4½ inches |
| 4½ | 3 inches by 4 7⁄8 inches |
| 5 | 2 7⁄8 inches by 5¼ inches |
| 5½ | 3 1⁄8 by 5½ inches |
| 6 | 3 3⁄8 inches by 6 inches |
| 7 | 3½ inches by 6½ inches |
On window envelopes a rectangle with rounded corners is cut out of the front of the envelope, to allow addresses printed on the letter within to show through. The hole is often covered with a patch of polyethylene, cellophane, or glassine. Only the most common sizes are listed below.
The window on the following sizes is 4¾ inches by 1 1/8 inches and is placed ¾ inch from the left for the 6¼ size and 7/8 inches for all other sizes, and ½ inch from the bottom.
| Size | Dimensions |
|---|---|
| 6¼ | 3½ inches by 6 inches |
| 6¾ | 3 5⁄8 inches by 6½ inches |
| 7 | 3¾ inches by 6¾ inches |
| 7¾ | 3 7⁄8 inches by 7½ inches |
The 8 5⁄8 inches window envelope comes in two versions.
| A Check | 3 5⁄8 inches by 8 5⁄8 inches. The window is:
|
| B Check | 3 5⁄8 inches by 8 5⁄8 inches The window is
|
The window on the following sizes is 4½ inches by 1 1/8 inches, and is located 7⁄8 inch from the left and ½ inch from the bottom.
| Size | Dimensions |
|---|---|
| 9 | 3 7⁄8 inches by 8 7⁄8 inches |
| 10 | 4 1⁄8 inches by 9½ inches |
| 11 | 4½ inches by 10 3⁄8 inches |
| Number | Height millimeters |
Width millimeters |
|---|---|---|
| C7 | 81 | 114 |
| C7/6 | 81 | 162 |
| DL | 110 | 220 |
| C6 | 114 | 162 |
| B6 | 125 | 176 |
| ½BC4 | 125 | 324 |
| E6 | 140 | 200 |
| C5 | 162 | 229 |
| B5 | 176 | 250 |
| E5 | 200 | 280 |
| C4 | 229 | 324 |
| B4 | 250 | 353 |
| E4 | 280 | 400 |
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Copyright © 2000 Sizes, Inc. All rights reserved.
Last revised: 11 March 2005.