US Envelope Sizes
What are the standard US envelope sizes? This page lists common US envelope formats with exact dimensions in inches and millimeters.
All US Envelope Paper Sizes Dimensions
| Size | Width × Height (mm) | Width × Height (in) | Width × Height (cm) |
|---|---|---|---|
| #10 | 241 × 104 | 9.49 × 4.09 | 24.10 × 10.40 |
| #9 | 225 × 98 | 8.86 × 3.86 | 22.50 × 9.80 |
| #7 | 172 × 95 | 6.77 × 3.74 | 17.20 × 9.50 |
| #6 | 267 × 191 | 10.51 × 7.52 | 26.70 × 19.10 |
| #8 | 286 × 210 | 11.26 × 8.27 | 28.60 × 21.00 |
| #11 | 264 × 114 | 10.39 × 4.49 | 26.40 × 11.40 |
| #12 | 279 × 121 | 10.98 × 4.76 | 27.90 × 12.10 |
| #14 | 292 × 127 | 11.50 × 5.00 | 29.20 × 12.70 |
| #6¾ | 165 × 92 | 6.50 × 3.62 | 16.50 × 9.20 |
| #6¼ | 152 × 89 | 5.98 × 3.50 | 15.20 × 8.90 |
| #7¾ Monarch | 191 × 98 | 7.52 × 3.86 | 19.10 × 9.80 |
| A Long | 225 × 98 | 8.86 × 3.86 | 22.50 × 9.80 |
Frequently Asked Questions
What are standard US envelope sizes?
The most common standard US envelope sizes include the #10 (4 1/8 × 9 1/2 inches), #9 (3 7/8 × 8 7/8 inches), and various A-series invitation envelopes.
What size is a standard business envelope?
The standard US business envelope is the #10 envelope, measuring 4 1/8 × 9 1/2 inches (approximately 105 × 241 mm). It is designed to hold a standard 8.5 × 11 inch Letter sheet folded in thirds.
What are #10 envelope dimensions?
#10 envelope dimensions are 4 1/8 × 9 1/2 inches, which is precisely 4.125 × 9.5 inches or 104.775 × 241.3 mm.
How are envelope dimensions measured?
Envelope dimensions are traditionally expressed as height × width, but often written as width × height in digital charts. The flap is typically on the longer edge for standard commercial envelopes.