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UK Royal Mail Pricing / Size Guide Help

UK Royal Mail Pricing / Size Guide Help

Work Out Which Format Your Mail Piece Falls Under

Below you will be able to find a helpful table which can be used as a guide when sending your mail. Work our what format your item falls under.

FormatExamplesMax. WeightMax. LengthMax. WidthMax. Thickness
LetterGreeting Cards, Bills, Invoices & Personal Letters100g24cm16.5cm0.5cm
Large LetterA4 Documents, Certificates, DVD case & cards with badges750g35.3cm25cm2.5cm
Small ParcelBoots, Portable devices & desk lamp2 Kg45cm35cm16cm
Medium ParcelGreeting Cards, Bills, Invoices & Personal Letters20 Kg61cm46cm46cm

PLEASE NOTE: The maximum weight limit for Special Delivery Guaranteed by 1pm™ items is 20 Kg. The maximum weight limit for Special Delivery Guaranteed by 9am items is 2 Kg.


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

Large Parcels

Parcels that are larger than 61cm x 46cm x 46cm or heavier than 20kg can be sent using Parcelforce services which include tracking and are guaranteed. If you wish to send items that have dimensions larger than those listed above, then you’ll need to send those items via Parcelforce Worldwide 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


To view the latest Royal Mail price list and see how much your mail will cost to send, download our Royal Mail PDF wall poster.

Mailcoms Size Guide Ruler

You can use our very own Royal Mail Size Guide Ruler to your advantage to ensure you always pay the correct postage. Simply get your mail item and see what size and slot it fits into, then weigh your item to calculate postage. This will help you avoid Royal Mail surcharges. If you are unsure about the size and weight our size guide ruler will be of use to you. Click here to purchase our Royal Mail Size Guide Ruler.

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