You are designing a room for a house and are drawing a floor plan. The room is actually 18 feet wide. On your floor plan, you draw the room as 6 inches wide. What is the scale factor (scale) for the floor plan?
The scale factor is calculated through the division of 18 on 6. Which simplifies down to 3:1
If 6 inches represent 18 feet, 1 inch will represent 3 feet.
So the scale is
1 inch on plan = 3 feet wide in actual life