problem with insetting faces i want to inset the face to 1 mt.
actually the face is 20x20.
when i apply it to  mi its insetting like  this 
but i need the result of the face 19 x 19 after insetting
 but im getting like that when i inset by 0.1 but its not correct to the actual diensions
In Object mode, select your object and press Ctrl+A, then select Scale.

This will make sure the Local scale of the vertices, match the Global scale of the scene.

This probably happened because you scaled your object in Object mode rather than in Edit mode.