Standard book sizes

Books can be any size. Here are the standard sizes to which most books follow:

 

134 x 197mm (Standard)
216 x 138mm (Demy)
210 x 148mm (A5)
234 x 156mm (Royal)
249 x 177mm (Pinched Crown Quarto)
246 x 189mm (Crown Quarto)
276 x 219mm (Demy Quarto)
297 x 210mm (A4)

 

it is often cheaper to use one of these.