Envelope Size Chart

Commercial / Official Sizes
( Commercial Flap; unless noted )

No.

Inches

Millimeters

6 1/4

3 1/2 x 6

89 x 152

6 3/4

3 5/8 x 6 1/2

92 x 165

7

3 3/4 x 6 3/4

95 x 171

Monarch (pointed Flap)

3 7/8 x 7 1/2

98 x 191

8 5/8

3 5/8 x 8 5/8

92 x 219

9

3 7/8 x 8 7/8

98 x 225

10 (also Square Flap)

4 1/8 x 9 1/2

105 x 241

11 (also Square Flap)

4 1/2 x 10 3/8

114 x 264

12 (also Square Flap)

4 3/4 x 11

121 x 279

14 (also Square Flap)

5 x 11 1/2

127 x 292

Booklet (Wallet Flap)

No.

Inches

Millimeters

3

4 3/4 x 6 1/2

121 x 165

5

5 1/2 x 8 1/8

140 x 206

6

5 3/4 x 8 7/8

146 x 225

6 1/2

152 x 229

6 5/8

6 x 9 1/2

152 x 241

6 3/4

6 1/2 x 9 1/2

165 x 241

7 1/4

7 x 10

178 x 254

7 1/2

7 1/2 x 10 1/2

191 x 267

9

8 3/4 x 11 1/2

222 x 292

9 1/2

9 x 12

229 x 305

10

9 1/2 x 12 5/8

241 x 321

13

10 x 13

254 x 330

Window (Commercial Flap)

No.

Inches

Millimeters

6 1/4

3 1/2 x 6

89 x 152

6 3/4

3 5/8 x 6 1/2

92 x 165

7

3 3/4 x 6 3/4

95 x 171

Monarch

3 7/8 x 7 1/2

98 x 191

8 5/8

3 5/8 x 8 5/8

92 x 219

9

3 7/8 x 8 7/8

98 x 225

10

4 1/8 x 9 1/2

105 x 241

11

4 1/2 x 10 3/8

114 x 264

12

4 3/4 x 11

121 x 279

14

5 x 11 1/2

127 x 292

Announcement (Square Flap)

No.

Inches

Millimeters

A-2

4 3/8 x 5 3/4

111 x 146

A-6

4 3/4 x 6 1/2

121 x 165

A-7

5 1/4 x 7 1/4

133 x 184

A-8

5 1/2 x 8 1/8

140 x 206

A-9

5 3/4 x 8 3/4

A-10

6 x 9 1/2

152 x 241

Slimline

3 7/8 x 8 7/8

98 x 225

Baronial (Pointed Flap)

No.

Inches

Millimeters

4

3 5/8 x 5 1/8

92 x 130

5

4 1/8 x 5 1/2

105 x 140

5 1/2

4 3/8 x 5 3/4

111 x 146

6

4 3/4 x 6 1/2

121 x 165

Lee

5 1/4 x 7 1/4

133 x 184