What can you Frank?

Size and weight formats for UK mail

The amount you pay depends simply on the size and weight of the item you are planning to post. Below given is the table from ©Royal Mail’s website for your reference. Use the table below to work out which format your item falls into.

Promo Franking What Can You Frank
Format Examples Max weight Max length Max width Max thickness
Letter Greetings cards, personal letters, postcards, bills 100g 24cm 16.5cm 5mm
Large Letter A4 documents, certificates, magazines, CD or DVD in case, some large greeting cards with badges 750g 35.3cm 25cm 2.5cm
Small Parcel Ladies boots, portable speakers, winter puffer coat, desk lamp 2kg 45cm 35cm 16cm
Medium Parcel Gifts, shoes, heavy or bulky items 20kg 61cm 46cm 46cm
Franking Tubes


For tube-shaped items, the length of the item plus twice the diameter must not exceed 104cm, with the greatest dimension being no more than 90cm.


Large parcels

Parcels greater in size than 61cm x 46cm x 46cm or heavier than 20kg can be sent using Parcelforce services which include tracking and are guaranteed.


Don’t pay more than you need to

You might consider folding your A4 document in half to fit into a C5 envelope. This would bring it down to the letter format, as long as it is still less than 5mm thick.