Whilst paper sizes and formats can seem obvious for those of us who use them all day long, we should always try and remember that most people have better things to do than worry about whether B2 is larger than A2 and whether DL is a third or a quarter of A4.

To help make sure you use the correct sizes, here is a list of the standard sizes:

A Series:
A0 841 × 1189mm
A1 594 × 841mm
A2 420 × 594mm
A3 297 × 420mm
A4 210 × 297mm
A5 148 × 210mm
A6 105 × 148mm
A7 74 × 105mm
A8 52 × 74mm
A9 37 × 52mm
A10 26 × 37mm