What Size Envelope for an A5 Card?
The right envelope size for A5 cards and what postage you need.
Exact dimensions
Quick answer
C5 envelope (229mm x 162mm). An A5 card (210mm x 148mm) fits perfectly in a C5 envelope. If the card is padded or has attachments, check it stays under 25mm for large letter rates. A5 cards in C5 envelopes usually qualify as large letters, not standard letters.
Common uses
If the card is padded or has attachments, check it stays under 25mm for large letter rates. 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
A5 cards in C5 envelopes usually qualify as large letters, not standard letters. 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
C5 envelope (229mm x 162mm). An A5 card (210mm x 148mm) fits perfectly in a C5 envelope.
A5 cards in C5 envelopes usually qualify as large letters, not standard letters. 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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