Size formats and weights - UK

The amount you pay depends simply on the size and weight of the item you’re sending.

Work out which format your item falls into

Mail formats
Format Examples Max weight Max length Max width Max depth
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
20kg 61cm 46cm 46cm


The maximum weight limit for Special Delivery Guaranteed by 1pm items is 20kg. The maximum weight limit for Special Delivery Guaranteed by 9am items is 2kg.



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.
Sending items with any dimension larger than those listed above? Then you’ll need to send those items via Parcelforce Worldwide services where items can measure up to:

  • 1.5m in length and 3m length and depth combined
  • Weight limit: 30kg
  • Large parcels can only be sent via Parcelforce.

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.