Method
How to calculate total square footage
The calculator handles rectangles. Divide irregular spaces into rectangles and add their areas separately.
FORMULATotal area = length × width × number of rooms
Worked example
Square-footage calculator example
A 16 ft by 12 ft room has 192 square feet of floor area.
Change one assumption at a time to see what drives the result. The output is an estimate, not a quote, forecast or recommendation.
FAQ
Square-footage calculator FAQ
How do I measure an L-shaped room?
Split it into non-overlapping rectangles, calculate each area and add them.
Does this calculate wall area?
No. This page calculates floor or plan area; the paint calculator uses wall dimensions.
Can I use metres?
Yes. Consistent metre inputs produce square metres, although the labels remain square units.