Envelope Sizes Chart: All Standard Sizes
Standard envelope sizes include business, invitation, and catalog formats. The most common are #10 (4⅛ × 9½″), A2 (4⅜ × 5¾″), and 9 × 12″ catalog envelopes.
This guide includes a complete envelope sizes chart covering commercial, invitation, and catalog envelopes with their dimensions and common uses.
✉️ Standard Envelope Sizes Chart
Envelopes are generally divided into business, invitation, and large mailing categories.
| Envelope | Dimensions | Common Use |
|---|---|---|
| #6¾ | 3⅝ × 6½ in | Personal letters & checks |
| #9 | 3⅞ × 8⅞ in | Reply envelope |
| #10 | 4⅛ × 9½ in | Business letters |
| A2 | 4⅜ × 5¾ in | Notes & cards |
| A6 | 4¾ × 6½ in | Greeting cards & photos |
| A7 | 5¼ × 7¼ in | 5×7 invitations |
| A9 | 5¾ × 8⅞ in | Large greeting cards |
| 6 × 9 | 6 × 9 in | Booklets & folded paper |
| 9 × 12 | 9 × 12 in | Flat documents |
| 10 × 13 | 10 × 13 in | Catalogs & reports |
🏢 Business & Commercial Envelopes
#6¾
Personal letters & checks.
#10
Most common business envelope.
#9
Designed as a reply envelope.
💌 Invitation & Greeting Card Envelopes
| Envelope | Fits | Best For |
|---|---|---|
| A2 | Folded cards | Thank-you notes |
| A6 | 4.5 × 6.25 cards | Greeting cards |
| A7 | 5 × 7 cards | Wedding invitations |
| A9 | Large cards | Oversized invitations |
📂 Large & Catalog Envelopes
6 × 9
Booklets and folded documents.
9 × 12
Full-size 8.5 × 11 sheets without folding.
10 × 13
Reports, catalogs, and thick documents.
📊 A7 vs 5×7 vs A5 vs C7
| Type | Purpose | Difference |
|---|---|---|
| A7 | US Invitation Envelope | Fits 5×7 cards |
| 5×7 | Card Size | Not an envelope standard |
| A5 | ISO Paper | Different measurement system |
| C7 | ISO Envelope | Smaller international size |
❓ Frequently Asked Questions
What size envelope fits 8.5 × 11 paper?
Use a #10 envelope folded in thirds or a 9 × 12 envelope unfolded.
Is 9 × 12 a standard envelope size?
Yes. It’s commonly used for mailing flat documents.
What size is an A7 envelope?
A7 measures 5¼ × 7¼ inches and fits standard 5×7 invitations.
What is the A6 envelope size?
A6 measures 4¾ × 6½ inches for greeting cards and photos.
What’s the difference between A7 and A9?
A9 is larger and accommodates bigger invitations and thicker cardstock.
See Related Dimensions:
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