Print page
Post Office® mailing weight and size guide
Use the size and weight guide to work out whether your items is a letter, large letter, packet or parcel
Check the size and weight of your letter or packet
The size, thickness and weight of the item you are sending will determine if it is a :
- Letter
- Large letter
- Packet
- Parcel
Letters:
Greeting cards, personal letters, postcards and C5 envelopes usually fall into the letter category.
Letter dimensions:
- Length: 240mm max
- Width: 165mm max
- Thickness: 5mm max
- Weight: 100g max
Large Letters:
The Large Letter format covers items like A4 documents, CDs and DVDs in their cases, some large greeting cards and most magazines.
Large Letter dimensions:
- Length: 353mm max
- Width: 250mm max
- Thickness: 25mm max
- Weight: 750g max
Packets:
The Packet format includes items like clothes, shoes, posters, and books.
Packet dimensions:
- Size limit for packets: 610mm x 460mm x 460mm max
- Size limit posters or other rolled items: 900mm max length. The length plus twice the diameter must be no more than 1040mm.
- Weight: there is no weight limit for items sent First Class. For Second Class, the item must be under 1000g.
Parcels:
If your item is over the maximum size or weight for the packet format, you will need to send it as a Parcel with Royal Mail Standard Parcels or Parcelforce Worldwide.
Parcel dimensions:
- Size limit: 1.5m and length/girth combined 3m
- Weight: up to 20kg (Royal Mail) or 30kg (Parcelforce Worldwide)
Ready to buy postage?
