All the wall clocks below come in 18 inches. Our large wall clocks are unique in that you can select the size you want in most styles. To see which size is best, cut out a piece of paper into 18″ and tape or pin it to where you want your clock. You will be able to see how that size looks in the space. If it is too small, you can go up to the next large wall clock size (24 inches) or if it is too small, try it in the 12″. Newspaper is great because it is large and readily available. You can even tape them up there and take pictures of the paper clock sizes so you can easily compare them side by side.