Measure the length of the room in feet
Measure the width of the room in feet
Multiply length by width
If the room is not a perfect rectangle, divide it into smaller rectangular sections
Measure each section separately
Calculate the square footage of each section
Add all section square footages together
For triangular areas, multiply base by height and divide by 2
For circular areas, multiply 3.14 by radius squared
Subtract any areas that should not be included, such as closets or alcoves, if needed
Use the final total as the room’s square footage