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Size and weight requirements
Each Registered Mail™ item must meet the size and weight specifications shown below.
Please note:
- The metric unit is the official measure. We only provide Imperial equivalents for reference and convenience.
- The longest dimension is the length, the second longest dimension is the width.
Standard Registered Mail
| Requirement | Minimum | Maximum |
|---|---|---|
| Length |
140 mm
5.6 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 | 1.3 to 1 | 2.6 to 1 |
| Weight |
2 g
0.07 ounces
|
50 g
1.76 ounces
|
1 The aspect ratio is the relationship between the length and the width. Standard Lettermail must be rectangular. Items that don’t meet this ratio (for example, square items) are subject to Other Lettermail prices.
Other Registered Mail
| Requirement | Minimum | Maximum |
|---|---|---|
| Length |
140 mm
5.6 inches
|
380 mm
14.9 inches
|
| Width |
90 mm
3.6 inches
|
270 mm
10.6 inches
|
| Thickness |
0.18 mm
0.007 inches
|
20 mm
0.8 inches
|
| Weight |
5 g
0.17 ounces
|
500 g
17.6 ounces
|
Prepaid Registered Mail envelopes
| Requirement | Standard letter | Other letter |
|---|---|---|
| Length |
240 mm
9.4 inches
|
318 mm
12.5 inches
|
| Width |
150 mm
5.9 inches
|
241mm
9.5 inches
|
| Weight |
50 g
1.76 ounces
|
200 g
7.1 ounces
|