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Paper these days comes in a variety of standardised sizes – all of which are referred to as ‘A’ sizes. From both the manufacturer’s and the customer’s point of view, this is handy, since everyone knows what everyone else is talking about, and it is easy to calculate since each A size is exactly half the area of the previous one, in a descending scale from A0 to A7. An A2 sheet folded in half will, therefore, produce two A3 sheets. One A3 sheet will produce two A4 sheets and so on.

The most frequently used sizes, these days, are A3, A4 and A5, and most professional correspondence will be on A4 paper since filing systems are organised specifically around this size. Most shop-purchased single-sheet writing paper comes in standard A4 size, largely because of this factor.

A3 It would be very unusual to write a letter on A3 paper. It would be almost impossible to fold out and read, let alone stuff into an envelope. It is more generally suitable for writing with accompanying drawings, page layouts and large spreadsheets.

A4 This is the standard size for letters. You can expect any regular business letter that you might send or receive to be printed on A4 paper. It creates a businesslike, clean look and is extremely handy to print out since it will fit perfectly into your printer hopper without having to make possibly complex adjustments. It is what people expect both for themselves and for their filing systems. Business correspondence should be typed on one side only, using continuation sheets for the second and subsequent pages.

A5 This notelet size tends to arise more frequently in card than in flexible paper format. It might be suitable for a very brief note or if your business letter is very short and will cause a sheet of A4 paper to appear slightly bald. If this might be the case, consider investing in some A5 paper which has a distinctive, old-fashioned appearance and may be more appropriate.