Find a room floor area and perimeter at once. Enter the room size to get square footage for flooring and linear feet for baseboard or trim.
Floor Area
— sq ft
Floor square footage.Usage Tip
Sketch the room and note each wall length. The perimeter here is the full loop — subtract about 3 ft for each doorway when buying baseboard.
THE MATH
Floor area = Length × Width
Perimeter = 2 × (Length + Width)
Totals = per-room values × number of rooms
Perimeter = 2 × (Length + Width)
Totals = per-room values × number of rooms
Floor area (square feet) sizes flooring, underlayment, and ceiling materials. Perimeter (linear feet) sizes baseboard, shoe molding, and crown.
This assumes rectangular rooms; break an L-shape into rectangles and total them.
This assumes rectangular rooms; break an L-shape into rectangles and total them.
Add a waste factor when you order the actual material — this gives the bare room area and perimeter.
Subtract door openings from the perimeter for baseboard (roughly 3 ft per standard door), and skip walls where trim is not run.
For flooring the floor area is what matters; for paint you want wall area instead (perimeter times wall height).
Subtract door openings from the perimeter for baseboard (roughly 3 ft per standard door), and skip walls where trim is not run.
For flooring the floor area is what matters; for paint you want wall area instead (perimeter times wall height).