What Size Is a Postcard?
UK postcard dimensions, Royal Mail requirements, and postage costs.
Exact dimensions
Quick answer
Standard UK postcard: 148mm x 105mm. This is A6 size, the most common postcard format. Postcards larger than this are charged as large letters. A standard postcard at A6 size qualifies for the cheapest stamp rate.
Common uses
Postcards larger than this are charged as large letters. This is one of the most commonly used sizes in the UK for both personal and business purposes. Understanding the exact dimensions helps you choose the right packaging, frame, or postage rate.
Need to know about postage? Check stamp prices or large letter stamp costs.
Postage information
A standard postcard at A6 size qualifies for the cheapest stamp rate. Always check the thickness and weight of your item as well as the dimensions. Items that exceed standard letter limits (240mm x 165mm x 5mm, 100g) need large letter postage. Items exceeding large letter limits (353mm x 250mm x 25mm, 750g) go as small parcels.
Envelopes and mailers in every size
C5, C6, DL, and custom sizes available. Quality envelopes for personal and business post.
Browse envelopesFrequently asked questions
Standard UK postcard: 148mm x 105mm. This is A6 size, the most common postcard format.
A standard postcard at A6 size qualifies for the cheapest stamp rate. Check Royal Mail size and weight limits for the correct rate.
Post Offices, stationery shops, supermarkets, and online retailers like ProcuraPack stock common envelope and stationery sizes.
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