How big is a small letter royal mail

A small letter, also known as a "small parcel" or "letter post", is a type of mail item that is defined by Royal Mail, the UK's postal service, as follows:

In terms of size, a small letter is roughly equivalent to a standard A5-sized sheet of paper, folded in half. It's a small, lightweight package that can be easily mailed through a standard letterbox.

It's worth noting that Royal Mail has specific rules and regulations for sending small letters, including requirements for packaging, labeling, and postage. If you're unsure about the size or weight of your item, it's always a good idea to check with Royal Mail or consult their website for more information.