Room Area Calculator – Calculate Area of Irregularly Shaped Rooms
Room area calculator computes room area for different shapes: rectangle, L-shape, U-shape, and polygon. Enter measurements and get area in square feet.
The tool supports irregular shapes in addition to regular rooms by dividing them into sections. Perfect for renovations, flooring material purchases, painting planning, and real estate listings.
How to Calculate L-Shaped Room Area?
L-shaped room is calculated by dividing it into two rectangles and adding the areas together. For example: 16 ft × 13 ft + 10 ft × 6.5 ft = 208 + 65 = 273 sq ft. Alternative method: calculate the full rectangle area and subtract the 'missing' corner area. The room area calculator does this automatically for all shapes.
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Browse all tools →The room area calculator computes room square footage based on measurements. A useful tool for home buyers, renovators, and decorators to estimate flooring material or paint needs.
Enter room dimensions and the calculator computes area in square feet – even for L-shaped and more complex rooms.
- Calculate rectangular room area from length and width.
- Add or subtract sections for irregularly shaped spaces.
- Use the result to estimate flooring, paint, or wallpaper quantities.
The area is mathematically accurate for given measurements, but real rooms may deviate from perfect rectangles.
- Measure rooms at multiple points – walls aren't always perfectly straight.
- Add 5-10% waste allowance for material calculations.
- Area doesn't include wall thickness or built-in fixtures.
This is floor area – living space and official room area are calculated by different rules.
- Official property documents may differ from your measurements.
- Sloped walls and bay windows may require separate calculations.
- The calculator doesn't address official living space classifications.