Calculate the floor area of one or more rooms and the total built-up area - add a row for each room in your house or building.
How to Use the Room Area Calculator
Enter a "Room Name" (optional), "Length", and "Width" for each room.
Use "Add Room" to add more rows, or the × button to remove one.
Click "Calculate Total Area" to see each room's area and the total built-up area, in both square meters and square feet.
How Room Area Is Calculated
Each room is treated as a rectangle, so its area is simply length × width. The calculator adds the areas of all rows to give the total in square metres, and converts the total to square feet by multiplying by 10.7639. Enter the length and width in metres. If you measured in feet, multiply by 0.3048 to convert to metres first; for example, 12 ft is 3.66 m.
Measure from the finished inner face of one wall to the inner face of the opposite wall, at floor level. In older buildings walls are rarely perfectly square, so measure both ends of the room and use the average.
Worked Example: A Small 1BHK
Room
Length × Width (m)
Area (m²)
Living room
5 × 4
20.00
Bedroom
4 × 3.5
14.00
Kitchen
3 × 2.5
7.50
Bathroom
2.4 × 1.5
3.60
Total
45.10 m² = 485.45 sq ft
This total is the sum of the internal floor areas, which is close to the carpet area of the flat. The figure in a builder's brochure for the same flat will be larger, for the reasons below.
Carpet Area, Built-up Area and Super Built-up Area
Carpet area: Under the Real Estate (Regulation and Development) Act, 2016, carpet area is the net usable floor area of an apartment, excluding the external walls, service shafts, exclusive balcony or verandah and exclusive open terrace, but including the area covered by internal partition walls. Builders registered under RERA must state this figure.
Built-up area: Carpet area plus the thickness of the walls, and often balconies. It is typically noticeably larger than carpet area.
Super built-up area: Built-up area plus a proportionate share of common areas such as lobbies, staircases, lifts and clubhouse. The difference between super built-up and carpet area is called the loading.
When comparing flats or checking a sale agreement, compare carpet area to carpet area. A price per square foot on super built-up area can look cheaper than it really is.
What the Total Area Is Used For
Estimating flooring, false ceiling or painting quantities room by room.
Checking whether a flat's measured carpet area matches what is written in the agreement.
Sizing air conditioners, which are usually chosen based on room area along with sun exposure and ceiling height.
Working out rent or maintenance charges where they are quoted per square foot.
Frequently Asked Questions
No, this calculates carpet area (the usable internal floor area) based on the length and width you enter. It doesn't add wall thickness, which is factored into "built-up area" or "super built-up area" figures used by builders.
This calculator assumes rectangular rooms. For L-shaped or irregular rooms, split the space into rectangular sections, add each as a separate row, and the total will still be accurate.
1 square meter equals approximately 10.7639 square feet, which is the conversion factor used here.
Divide square feet by 9, since one square yard is 3 ft × 3 ft. For example, 485 sq ft is about 54 sq yd. One square yard is about 0.836 m².
Builders often advertise built-up or super built-up area, which includes walls and a share of common areas. Your room-by-room measurement is close to carpet area, which is always the smallest of the three figures.