Area converter: sq ft, sq m, gunta, cent and acre

1.10.1 Which area units do you meet when you buy a home in Bangalore?

You meet seven area units when you buy a new home in Bangalore. Builders quote flats in square feet. K-RERA project pages list the carpet area of each unit in square metres. Land records use acres and guntas, and some plot sellers use cents. Large land parcels sometimes appear in hectares or square yards. The units are fixed by definition, so the conversion is exact. The international foot is exactly 0.3048 metre, which makes 1 square foot exactly 0.09290304 square metre. An acre is 43,560 square feet, according to the NIST conversion table. Karnataka divides the acre into 40 guntas, as the Government of India land records data standard lists. One cent is 1/100 of an acre. Use the converter at the top of this page for any value. The table below gives each unit in square feet and square metres, so you can check a number by hand.

Unit	Square feet	Square metres	Where you see it
1 square foot (sq ft)	1	0.0929	Brochures, cost sheets
1 square metre (sq m)	10.7639	1	K-RERA unit tables, approvals
1 square yard (sq yd)	9	0.8361	Some plot and land listings
1 cent	435.6	40.47	Plot listings, Kerala and Tamil Nadu records
1 gunta	1,089	101.17	Karnataka RTC and land deals
1 acre	43,560	4,046.86	Project land, RTC
1 hectare	107,639	10,000	Large land parcels

Source: NIST conversion table and the MDDS land units annexure, checked 12 October 2026. Values in square metres are rounded to two decimals.

1.10.2 How do you convert square feet to square metres?

To convert square feet to square metres, multiply the square feet by 0.09290304. To convert square metres to square feet, multiply by 10.7639. Both factors come from the international foot of exactly 0.3048 metre, which NIST lists as an exact value. For a quick check, divide square feet by 10.764 instead. This matters for a new flat because the two documents you compare use different units. K-RERA project pages list the carpet area of each unit in square metres. The builder’s brochure and cost sheet usually quote square feet, and often quote the super built-up area. Section 2(k) of the RERA Act defines carpet area as the net usable floor area of the apartment. So convert the K-RERA figure to square feet first. Then compare it with the carpet area in your cost sheet and agreement for sale. If the two numbers differ by more than rounding, ask the builder which one is correct.

Here is an example from a K-RERA unit table that Sachi read on 9 October 2026. Unit C 1402 in Rohan Ekanta Phase 1 has a carpet area of 74.62 square metres. Multiply 74.62 by 10.7639, and you get about 803 square feet. That is the carpet area. The super built-up area in a brochure will be larger, because it adds a share of the common areas. The carpet area guide explains the three areas, and the loading factor guide shows how to work out the difference.

Square metres	Equals square feet	Square feet	Equals square metres
50	538.2	600	55.74
75	807.3	1,000	92.90
100	1,076.4	1,200	111.48
150	1,614.6	1,500	139.35
200	2,152.8	2,000	185.81

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1.10.3 How big is a gunta, and how do you convert guntas to acres?

A gunta is a unit of land area used in Karnataka and Andhra Pradesh. Forty guntas make 1 acre, as the Government of India land records data standard (MDDS) lists. An acre is 43,560 square feet, so 1 gunta is 1,089 square feet. In metric units, 1 gunta is about 101.17 square metres. To convert guntas to acres, divide by 40. To convert acres to guntas, multiply by 40. To convert guntas to square feet, multiply by 1,089. The RTC, Karnataka’s record of rights for a survey number, shows the extent of each parcel in acres and guntas. So the land under a new project usually appears as, for example, “2 acres 15 guntas” in the RTC and pahani. That parcel is 2.375 acres, or 95 guntas, or 103,455 square feet. Use the converter above to change any extent into square metres, then compare it with the land area on the K-RERA project page.

The MDDS table rounds the gunta to “100 Sq metres (around 1100 sq feet)”. That rounding is fine for a rough idea. It is too coarse for a price. On a ₹1 crore land deal for 10 guntas, the gap between 1,089 and 1,100 square feet a gunta is 1%, or about ₹1 lakh. Use 1,089 square feet when money depends on the number.

Guntas	Acres	Square feet	Square metres
1	0.025	1,089	101.17
5	0.125	5,445	505.86
10	0.25	10,890	1,011.71
20	0.5	21,780	2,023.43
40	1	43,560	4,046.86

1.10.4 What is a cent, and how do you convert cents to square feet?

A cent is 1/100 of an acre. So 1 cent is 435.6 square feet, or about 40.47 square metres. To convert cents to square feet, multiply by 435.6. To convert square feet to cents, divide by 435.6. To convert cents to guntas, divide by 2.5, because 1 gunta is 2.5 cents. The MDDS annexure lists “1 Acre = 100 cents” for Kerala and Tamil Nadu. It rounds 1 cent to 40 square metres or 435 square feet. Karnataka land records use acres and guntas. Some plot sellers and buyers around Bangalore still quote cents, often because they come from Kerala or Tamil Nadu. If a seller quotes a price per cent, convert it to a price per square foot before you compare it with other plots. For example, ₹20 lakh a cent is about ₹4,591 a square foot. Then check the extent in the RTC, which gives it in acres and guntas.

Sachi’s reading: a price quoted per cent makes a plot look cheaper than it is when you compare it with a price per square foot. Always compare on the same unit.

Cents	Square feet	Guntas	Square metres
1	435.6	0.4	40.47
2.5	1,089	1	101.17
5	2,178	2	202.34
10	4,356	4	404.69
100	43,560	40	4,046.86

1.10.5 How do you convert square yards and hectares?

A square yard is 9 square feet, because a yard is 3 feet. In metric units, 1 square yard is about 0.8361 square metre. To convert square yards to square feet, multiply by 9. To convert square feet to square yards, divide by 9. Square yards appear in some plot listings and in some older deeds. A hectare is 10,000 square metres, about 2.4711 acres or about 98.84 guntas. Hectares are the metric unit that the MDDS standard lists for land. For a home buyer in Bangalore, hectares matter mainly when you read a government notice about land. The NIST table gives the acre as exactly 4,046.8564224 square metres, so the hectare to acre factor is exact to many decimals. Use the converter above for any of these units. It converts one value into all seven units at once, and it updates as you type.

From	To	Multiply by
Square yards	Square feet	9
Square feet	Square yards	0.1111
Square yards	Square metres	0.8361
Hectares	Acres	2.4711
Acres	Hectares	0.4047
Hectares	Guntas	98.84

1.10.6 How do you use area units to check a new project?

Use area units to test three numbers that a builder gives you. First, convert the carpet area of your unit on the K-RERA page from square metres to square feet. Compare it with the carpet area in the cost sheet and the agreement for sale. Second, convert the land area of the project to acres. The Karnataka RERA guide shows where the land area appears on the project page. Divide the number of homes by the acres to get the homes per acre. A project with 400 homes on 4 acres has 100 homes per acre. Compare this number across the projects on your list. Sachi’s reading: more homes per acre usually means more people per lift, per road and per amenity. Third, match the land extent on K-RERA with the extent in the RTC for each survey number. The RTC gives acres and guntas, so convert both to square metres.

If the numbers do not match, ask the builder for the reason in writing. A road widening, a civic amenity site or a part of the land kept for a later phase can explain a gap. The master plan guide covers how to read the land use of a project.

Check	Units to convert	Red flag
Unit carpet area	K-RERA sq m to sq ft	Cost sheet carpet area larger than the K-RERA figure
Homes per acre	K-RERA land area to acres	Much higher density than similar projects nearby
Land extent	RTC acres and guntas to sq m	K-RERA land area larger than the total of the RTCs
Plot size	Cents or sq yd to sq ft	Price per cent that hides a high price per sq ft

1.10.7 Which mistakes do buyers make with area units?

Buyers make four common mistakes with area units. The first is using a rounded factor for a price. One gunta is 1,089 square feet, but some tables round it to 100 square metres or 1,100 square feet. One square metre is 10.7639 square feet, but some people use 10 or 11. On a large amount, a 1% rounding error is a real sum of money. The second mistake is mixing areas. A brochure figure in square feet is often the super built-up area, while K-RERA gives the carpet area. Converting the units does not make the two areas equal. The third mistake is reading “2.15 acres” as 2 acres and 15 guntas. In decimal form, 2.15 acres is 2 acres and 6 guntas. In land records, the acre and gunta parts are separate numbers. The fourth mistake is trusting a single figure. Check the area in at least two documents before you pay.

Section 3(2)(a) of the RERA Act shows why exact units matter. It exempts a project from registration when its land is 500 square metres or less, or when it has 8 apartments or fewer, inclusive of all phases. Five hundred square metres is about 5,382 square feet, or about 4.94 guntas. A small project close to this line must still show its numbers, and you can check them with the converter.

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1.10.8 Does a resale buyer use the same conversions?

A resale buyer uses the same conversions, because the units do not change with the type of sale. The documents are different. For a resale flat, the area comes from the seller’s registered sale deed, the khata and the original agreement with the builder. Older deeds often give the super built-up area in square feet, without the carpet area. Some older deeds of independent houses and plots give the extent in square yards or in feet by feet, such as 30 x 40. Convert each figure to one unit, such as square feet, and compare the deed, the khata and the tax receipt. For a plot or an independent house on converted land, the RTC and the 11E sketch give the extent in acres and guntas. The title deed guide explains how to check the chain of deeds. The Sachi Home Buyer’s Guide covers new homes. A full guide for resale buyers is coming soon.

Document	Usual unit	Convert to
Builder brochure and cost sheet	Square feet (often super built-up)	Square feet carpet area
K-RERA unit table	Square metres (carpet area)	Square feet
RTC and 11E sketch	Acres and guntas	Square metres or square feet
Old sale deed of a plot	Square feet, square yards or feet by feet	Square feet