Envelope Sizes
The standard US business envelope is the #10, measuring 4.125 × 9.5 inches (105 × 241 mm). Envelope sizes are categorized by type: commercial envelopes for business mail, announcement envelopes for cards and invitations, catalog envelopes for large documents, and ISO C series for international use.
What are Standard Envelope Sizes?
The most common business envelope is the #10 at 4.125 × 9.5 inches (105 × 241 mm). For international mail, the DL envelope at 110 × 220 mm is the standard, sized to fit an A4 sheet folded in thirds.
| Name | Inches (W × H) | Millimeters (W × H) | Notes |
|---|---|---|---|
| #6 3/4 | 3.625 × 6.5 | 92 × 165 | Personal and reply mail |
| #9 | 3.875 × 8.875 | 98 × 225 | Return envelope (fits inside #10) |
| #10 | 4.125 × 9.5 | 105 × 241 | Standard business envelope |
The #10 envelope fits a US Letter sheet folded in thirds.
US Announcement Envelopes
| Name | Inches (W × H) | Millimeters (W × H) | Fits Card Size |
|---|---|---|---|
| A2 | 4.375 × 5.75 | 111 × 146 | 4.25 × 5.5 in folded card |
| A6 | 4.75 × 6.5 | 121 × 165 | 4.5 × 6.25 in card |
| A7 | 5.25 × 7.25 | 133 × 184 | 5 × 7 in card |
| A9 | 5.75 × 8.75 | 146 × 222 | 5.5 × 8.5 in card |
| A10 | 6 × 9.5 | 152 × 241 | 5.75 × 9.25 in card |
Announcement envelopes are sized to fit standard greeting cards and invitations with a small clearance margin.
US Catalog Envelopes
| Name | Inches (W × H) | Millimeters (W × H) | Notes |
|---|---|---|---|
| 6 × 9 | 6 × 9 | 152 × 229 | Booklets, small catalogs |
| 9 × 12 | 9 × 12 | 229 × 305 | Fits Letter/A4 unfolded |
| 10 × 13 | 10 × 13 | 254 × 330 | Fits Letter with extra clearance |
Catalog envelopes open on the short side and are designed for flat mailing of documents, magazines, and booklets.
ISO C Series Envelopes
| Size | Millimeters (W × H) | Inches (W × H) | Designed For |
|---|---|---|---|
| C4 | 229 × 324 | 9.02 × 12.76 | A4 unfolded |
| C5 | 162 × 229 | 6.38 × 9.02 | A4 folded in half / A5 unfolded |
| C6 | 114 × 162 | 4.49 × 6.38 | A4 folded twice / A6 |
| DL | 110 × 220 | 4.33 × 8.66 | A4 folded in thirds |
The DL envelope is the most common international business envelope, equivalent in function to the US #10.
Envelope Size in Pixels
Pixel dimensions for the #10 envelope (4.125 × 9.5 in):
| DPI | Width (px) | Height (px) | Use |
|---|---|---|---|
| 72 | 297 | 684 | Screen preview |
| 150 | 619 | 1425 | Draft printing |
| 300 | 1238 | 2850 | Standard commercial print |
| 600 | 2475 | 5700 | High-quality print |
Use our free Inches to Pixels converter or Millimeters to Pixels converter to calculate pixel dimensions at any DPI.
Envelope with Bleed
Standard bleed for envelopes is 0.125 inches (3 mm) per side.
| Envelope | Trim (in) | With Bleed (in) | Pixels at 300 DPI |
|---|---|---|---|
| #10 | 4.125 × 9.5 | 4.375 × 9.75 | 1313 × 2925 |
| A7 | 5.25 × 7.25 | 5.5 × 7.5 | 1650 × 2250 |
| 9 × 12 | 9 × 12 | 9.25 × 12.25 | 2775 × 3675 |
Common Uses
- Business correspondence and invoicing
- Wedding and event invitations
- Direct mail marketing campaigns
- Product and document shipping
- Greeting cards and personal stationery
Design Tips
- For window envelopes, confirm the window position and size with your printer before designing. Standard window placement is 0.875 in from the left and 0.5 in from the bottom.
- Follow USPS or local postal guidelines for address placement, barcode clearance zones, and postage area.
- Account for the flap when designing full-bleed envelopes — the flap adds material that needs printing.
- For bleed setup, extend artwork past the trim line. For resolution guidelines, use 300 DPI minimum.
How to Design Custom Envelopes
Custom-printed envelopes are typically designed in Adobe InDesign or Illustrator. Set your document to the envelope's flat dimensions, add bleed if printing full-color backgrounds, and define safe areas for the return address, recipient address, and postage. Many commercial printers provide downloadable envelope templates with die lines and fold guides.
For teams using Figma, the Print for Figma plugin lets you set up any envelope size with custom dimensions, add bleed and margins, and export a press-ready CMYK PDF. This makes it easy to keep envelope designs consistent with the rest of your brand collateral in one collaborative tool. Learn more about designing envelopes in Figma →
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