Royal Mail Slot Size
Royal Mail Slot Size Average ratng: 5,0/5 4698 votes
Styles and usage. A 'letter box', or 'mail slot' in American and Canadian usage, is a slot, usually horizontal but sometimes vertical, about 30 cm by 5 cm (12 inches by 2 inches), cut through the middle or lower half of a front door. Download the Royal Mail App to find a Parcel Postbox near you or check this page regularly to keep up to date with the latest locations. The maximum Parcel size allowed into our new Postboxes is 44cm x 35cm x 16cm.
| older postbox ; smaller slot |
The biggest slots are pobably in new areas and also at the local main post office.
Note : The slot slopes upwards
The slot tends to slope upwards (e.g. to keep out rain I guess), so if tight, it could be worth trying to push the parcel in slightly upwards (to follow the angle).
Can you put parcels in postboxes :My understanding is YES. I have put parcels in.
Estimate sizes :
An estimate would be between 8-12 inches wide and maybe 5.5cm high (or smaller).
Width : In old areas, it can be as little as 8 inches wide. But in the newest areas it may be around 12 inches wide. And areas between old and new may vary between these sizes. This rule probably applies to height as well.
Height : As mentioned above, the newer the postbox the more likely it has more height. My local postbox made around 1981 is probably around 5.5cm high.
Royal Mail Post Box Slot Size
I use a postbox probably built around 1981 which has a bigger slot than older versions (both in width and height)
Examples for 1980's postbox slot :
Using a
Royal Mail Slot Size Chart
circa 1981 postbox, I have found the following :
| UK postbox slot (1981) | width | height |
| 20 cm : fits easily 25 cm : fits quite easily large letter size (exactly) : should fit 1980+ slot easy | 4.8cm high package : fits easily 6 cm high box : does not fit |
Note : Older postboxes tend to have much smaller slots !