May be used for U.S.P.S. Residential door mail delivery; Made of brass; Letter size mail slot overall dimensions are 8-3/4' W x 2-7/8' H; Rough opening dimensions are 6-7/8' W x 1-3/4' H; Include an 8' W x 2' H spring loaded flap; Include 2 pieces - flap for the front of a wall or solid door and inside trim for the rear. 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.

Here you will find detailed information including sizes and costs for sending standard letters and large letters with Royal Mail.

Royal Mail Size & Weight Guide For Letters

• Remember settings you've applied (such as layout, text size, preferences and colours) Remember selections you have made (such as search functions and results, and goods and services) Apply customised content segments to individual users.
• Updated with current prices and has:- Large letter slot that is now 250mm x 25mm and the Letter slot which is now 165mm x 5mm It also now includes Packet pricing for UK first class packets from 1kg upwards. Packets above 1kg can only be 1st class Prices seem to have gone up by 10%-12% The larger the item or its weight The price increase seems to be more like 10% than 12% NOTE! When using this.
• RM Postie here - there is no standard size for the opening in the post boxes as it depends entirely on where its sighted, the type of box and if it is at a busy location. However most are usually.

Letters

Ideal for mailing greeting cards, regular letters and postcards, the maximum size that would fall under a 'letter' is 165 mm x 240 mm. We would recommend using an envelope no larger than C5 to fit these restrictions comfortably and avoid any excess costs. The envelope and contents must also weigh under 100g.

Recommended envelope sizes

Cost for sending a letter

Royal Mail Post Box Slot Size

Large Letters

For mailing contents such as A4 sized documents, DVDs, certificates, large greeting cards and magazines you would need to send as a large letter. The maximum size is 250 mm x 353 mm and and a maximum weight of 750g so a C4 envelope is a good choice.

Royal Mail Slot Sizes

Recommended envelope sizes for a large letter

Cost for sending a large letter

Here you will find detailed information including sizes and costs for sending standard letters and large letters with Royal Mail.

Royal Mail Size & Weight Guide For Letters

Letters

Ideal for mailing greeting cards, regular letters and postcards, the maximum size that would fall under a 'letter' is 165 mm x 240 mm. We would recommend using an envelope no larger than C5 to fit these restrictions comfortably and avoid any excess costs. The envelope and contents must also weigh under 100g.

Recommended envelope sizes

Cost for sending a letter

Large Letters

For mailing contents such as A4 sized documents, DVDs, certificates, large greeting cards and magazines you would need to send as a large letter. The maximum size is 250 mm x 353 mm and and a maximum weight of 750g so a C4 envelope is a good choice.

Recommended envelope sizes for a large letter

Cost for sending a large letter