What size is large letter royal mail

According to Royal Mail's guidelines, a "Large Letter" is a type of mail that measures between 240mm x 165mm x 15mm (9.4in x 6.5in x 0.6in) and 353mm x 250mm x 17mm (13.9in x 9.8in x 0.7in).

In other words, a Large Letter is a mailpiece that is larger than a standard A4 sheet of paper (210mm x 297mm or 8.3in x 11.7in) but smaller than a standard A3 sheet of paper (297mm x 420mm or 11.7in x 16.5in).

Here are some examples of items that might be considered Large Letters:

Keep in mind that Royal Mail has specific rules and regulations for sending Large Letters, including weight limits and special handling requirements. If you're unsure about the size or weight of your mailpiece, it's always best to check with Royal Mail or consult their website for more information.