HI blenderheads ,i have to do a proyect of a bar , so i went and took the sizes of the place , 20 meters, 9 meters , 45 cm etc…

then i go to blender add a plane and … oops , how do i do a plane of 20 m by 9 m , i decided to use 20 grid squares by 9 grid squares , but then some other sizes like 45 cm was a bit more complicated , and so on , so

How do i insert some kind of mesures in blender ? is it possible to insert cm or meters mesures in blender , as far as i know not,

so how do you guys deal with this ?

please help !!!