The largest standard envelope size to fit within this range is a C4, which measures 324mm x 229mm, fitting nicely under the size limits. The maximum size dimensions for a letter to be mailed as Royal Mail large letter is 353mm x 250mm. What is the largest size envelope that can be sent as 'Large Letter'? Click here to see our range of C5 Envelopes . The weight must be less than 100g when filled and sealed and the depth/thickness must be less than 5mm. The largest standard envelope size for standard post would be a C5, with dimensions of 229mm x 162mm. The maximum envelope size you can use for standard post is 240mm x 165mm.

Many people refer to the Royal Mail 'letter' format as standard post. What is the largest envelope size for standard post? Weight of the envelope filled with contents must be less than 100g and thickness must be less than 5mm.

C5 envelopes are designed to fit A5 papers/cards or A4 folded in half. The largest standard envelope size to fit within this range is a C5, which measures 229mm x 162mm, giving a few mm extra allowance to fit nicely under the limit. The maximum size dimensions for a letter to be mailed as Royal Mail 'letter' is 240mm x 165mm. What is the largest size envelope that can be sent as 'letter'? Suggested Envelope Sizes for Royal Mail Postage Rates We’ve answered your ‘most asked questions’ about envelopes and postage costs below too! Letter & Parcel Size Guide for Royal Mail PostageĮxample of Contents : Greeting card, lettersĮnvelope Suggestions : C6 Envelopes, DL Envelopes, C5 EnvelopesĮxample of Contents : A4 documents, magazinesĮnvelope Suggestions : Padded Bubble Envelopes, Book Wraps Our handy envelope postage guide below will help you work out the postage costs for different envelope sizes.

Standard envelope sizes square