Measure the length of the room in feet
Measure the width of the room in feet
Multiply the length by the width
Use the formula: square feet = length × width
If the room is not a perfect rectangle, divide it into smaller rectangular sections
Calculate the square feet of each section
Add the section totals together
If measurements are in inches, divide by 12 to convert to feet first
If the room has alcoves or closets, measure them separately and include them if needed