Carpet, Built-up and Super Built-up Area
Convert between carpet, built-up and super built-up area, with price per sq ft
| Basis | sq ft | sq m | sq yd |
|---|---|---|---|
| Carpet area | 857.14 | 79.63 | 95.24 |
| Built-up area | 960 | 89.19 | 106.67 |
| Super built-up area | 1,200 | 111.48 | 133.33 |
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Results are for general guidance. Please check anything important before relying on it. Terms of use
How to Use
- Choose which figure you have: carpet area, built-up area or super built-up area.
- Pick the unit (sq ft, sq m or sq yd) and enter the area.
- Set the wall area percentage (10–15% is typical) and the loading percentage the builder applies (25–30% is common). Ask the builder for the real figures if you can.
- Add the total price to see the rate per sq ft on each basis. The other two areas, the overall loading and a table in all three units update as you type.
Carpet area, built-up area and super built-up area
When you buy a flat in India, three different areas can appear in the brochure, the price sheet and the agreement. Only one of them is the floor you can actually use. This carpet area converter works out all three from whichever one you have, so you can compare flats fairly and see what you really pay per square foot of usable space.
Carpet area under RERA
The Real Estate (Regulation and Development) Act, 2016 defines carpet area in section 2(k) as the net usable floor area of an apartment. It excludes the area under the external walls, service shafts, the exclusive balcony or verandah and the exclusive open terrace, but it includes the area under the internal partition walls. Builders of RERA-registered projects must declare the carpet area of each flat, and several state RERA authorities, such as Haryana's and Uttar Pradesh's, require flats to be sold on carpet area. Balconies and terraces are listed separately.
Built-up and super built-up area
Built-up area is the carpet area plus the area of the walls (and some builders add balconies here). Super built-up area adds your share of the common areas: lobby, staircase, lift shafts, corridors and often the clubhouse. That share is called loading. Neither term is defined in RERA, so each builder can work them out differently.
Super built-up = built-up × (1 + loading %)
Carpet = super built-up ÷ (1 + loading %) ÷ (1 + wall %)
Worked example
A 2 BHK is advertised at 1,200 sq ft super built-up for ₹80 lakh. With 25% loading and 12% for walls:
- Built-up area: 1,200 ÷ 1.25 = 960 sq ft
- Carpet area: 960 ÷ 1.12 = 857 sq ft
- Price per sq ft on super built-up: ₹80,00,000 ÷ 1,200 = ₹6,667
- Price per sq ft on carpet: ₹80,00,000 ÷ 857 = ₹9,333
So the overall loading on carpet is 40%. A flat quoted at a lower rate per sq ft can turn out costlier once you compare carpet areas.
Typical figures
| Item | Usual range | What it covers |
|---|---|---|
| Wall area | 10–15% of carpet | External walls; more if balconies are counted |
| Loading | 25–30% of built-up | Lobby, stairs, lifts, corridors |
| High-rise with amenities | 35% or more | Clubhouse, pool, gym added to common area |
These are rules of thumb, not fixed numbers. The real figures differ from project to project, so ask the builder for the carpet area in writing and check it against the plan on your state's RERA website.
Units
1 sq m = 10.764 sq ft and 1 sq yd = 9 sq ft. Plots in many states are sold in square yards (gaj), while flats are usually priced in sq ft. The table in the calculator shows each area in all three units.