What does this tool do?
Floor area is length multiplied by width, but flooring and paint estimates often need square metres or perimeter too. This calculator converts a rectangular room between common units.
The Formula
Area = Length × Width; Perimeter = 2 × (Length + Width)Frequently Asked Questions
How do I measure an irregular room?
Split it into rectangles, calculate each area and add them. Measure at floor level and include alcoves that are part of the usable floor.
Why add a waste allowance for flooring?
Cuts at walls, doorways and angled corners leave offcuts. A waste allowance makes sure the ordered material covers the installed area.