Royal mail large letter size

According to Royal Mail's guidelines, a Large Letter is a type of mail that measures between 240mm x 165mm x 15mm and 353mm x 250mm x 17mm. This size range is slightly larger than a standard A4 sheet of paper.

Here are the exact dimensions for a Large Letter:

Large Letters are considered a special size because they don't fit into the standard A4 or A5 envelopes. They require a larger envelope or a special Large Letter envelope to accommodate their size.

Keep in mind that these dimensions are subject to change, so it's always a good idea to check with Royal Mail for the most up-to-date information on Large Letter sizes.