The standard size for a letterhead is typically A4 which is 210mm wide by 297mm high (or 8.5 inches by 11 inches in the US). However, letterheads can come in different sizes, depending on the company's preference and needs. For example, some companies may opt for a smaller size, such as A5 or 8.5 inches by 5.5 inches, for a more compact and portable letterhead. It is important to consider the intended use of the letterhead and choose a size that will fit the company's branding and communication needs. All of our letterheads are custom printed which means we can produce printed letterheads at all standard sizes as well as custom sizes.