USA/CANADA Paper and Envelope Sizes
The designations under the system A2, etc., do not correspond to ISO paper sizes
ANSI Paper sizes
Name
Metric (mm)
Imperial (in)
Alias
ISO216Equivalent
ANSI A
279 × 216
8.5 × 11
Letter
A4
ANSI B
432 × 279
11 × 17
Ledger, Tabloid
A3
ANSI C
559 × 432
17 × 22
A2
ANSI D
864 × 559
22 × 34
A1
ANSI E
1118 × 864
34 × 44
A0
Envelope Sizes
Format
Mini
2 1/8 x 3 5/8
54 x 92
4 3/8 × 5 3/4
111 × 146
A6
4 3/4 × 6 1/2
120 × 164
A7
5 1/4 × 7 1/4
133 × 184
A8
5 1/2 x 8 1/8
140 x 206
A9
5 x 8 3/4
127 x 222
A10
4 1/8 x 9 1/2
105 x 241
No. 6¾
3 5/8 × 6 1/2
92 × 165
No. 9
3 7/8 × 8 7/8
98.5 × 225.5
No. 10
4 1/8 × 9 1/2
105 × 241
Catalog
9 x 12
229 x 305