Please note:
We charge the Standard Letter-post price on items paid by postage stamps that don’t meet the ratio but fall within maximum standard sizes.
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Size and weight requirements
Each Letter-post item must meet the size and weight specifications shown below.
Standard Letter-post envelopes and self-mailers
| Requirement | Minimum | Maximum |
|---|---|---|
| Length |
140 mm
5.5 inches
|
245 mm
9.6 inches
|
| Width |
90 mm
3.6 inches
|
156 mm
6.1 inches
|
| Thickness |
0.18 mm
0.007 inches
|
5 mm
0.2 inches
|
| Aspect ratio | 1.3 to 1 (U.S.) or 1.4 to 1 (International) | 2.6 to 1 |
| Weight | Not applicable |
50 g
1.76 ounces
|
Standard Letter-post cards and postcards
| Requirement | Minimum | Maximum |
|---|---|---|
| Length |
140 mm
5.5 inches
|
235 mm
9.2 inches
|
| Width |
90 mm
3.6 inches
|
120 mm
4.7 inches
|
| Thickness |
0.18 mm
0.007 inches
|
Not applicable |
| Aspect ratio | 1.3 to 1 | 2.6 to 1 |
| Weight | Not applicable |
50 g
1.76 ounces
|
Other Letter-post items
| Requirement | Minimum | Maximum |
|---|---|---|
| Length |
140 mm
5.5 inches
|
380 mm
15 inches
|
| Width |
90 mm
3.6 inches
|
270 mm
10.6 inches
|
| Thickness |
0.18 mm
0.007 inches
|
20 mm
0.79 inches
|
| Aspect ratio | Not applicable | Not applicable |
| Weight | Not applicable |
500 g
17.6 ounces
|