What is the standard paper size for formal letter? October 22, 2021 by admin 8.5 by 11 inches >> Click to read more << Related PostsHow do I write a formal letter to the tax office?What is the size of a standard letter envelope?Which letter has the same sound as the letter H in English?What size is a 22 mm in standard size?What is the size of a standard size brick?What is the standard size of a king size mattress?