How area is calculated
For any rectangle, area is simply length times width. Enter both in feet and the calculator returns the floor area in square feet, then converts that figure to square meters and square yards so you can match whatever unit your flooring, paint, or material is sold in.
If you also enter a price per square foot, it multiplies the area by that rate to give a quick material cost — handy for pricing carpet, tile, laminate, or anything quoted by the square foot.
Measuring rooms that are not simple rectangles
Real rooms have alcoves, bay windows, and L-shapes. The trick is to break the floor plan into rectangles you can measure individually, calculate each one, and add the results together.
- Divide an L-shaped room into two rectangles and sum their areas.
- For a bay or alcove, treat it as its own small rectangle.
- Subtract large permanent fixtures (like a kitchen island footprint) only if they will not be covered.
- Measure to the longest and widest points and round up slightly to be safe.
Why the unit conversions help
Materials are not all sold in the same unit. Carpet is often priced by the square yard, many imported tiles and engineered floors are sold by the square meter, and paint and domestic flooring usually use square feet. Seeing all three at once lets you compare quotes without doing the conversion by hand.
One square yard is nine square feet, and one square meter is about 10.76 square feet. Keeping these relationships in mind makes it easy to sanity-check a supplier's figures.
Allowing for waste and caveats
This calculator gives the exact area of the space, which is the floor area, not the amount of material to buy. Almost every material needs extra for cuts, pattern matching, and breakage — typically 5 to 10 percent for flooring and more for diagonal or patterned layouts. Add that margin on top of the area shown, and treat the cost figure as a materials-only estimate that excludes underlay, adhesive, trim, and labor.
Formula
area(ft²) = length(ft) × width(ft); total cost = area × price per ft²Frequently asked questions
- How do I measure an irregular room?
- Split it into rectangles, calculate each one, and add the areas together.