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What is an Area Converter?
An area converter converts a surface measurement between metric and traditional units — square millimetres, square centimetres, square metres, square kilometres, acres, hectares, square feet, and square yards. Indian real estate listings almost always quote apartment carpet or built-up area in square feet, while agricultural land is measured in acres or hectares, and land records in several states still reference older local units. Buyers comparing a "1,200 sq ft" flat with a builder's brochure in square metres, farmers converting hectares to acres for a loan application, or students solving mensuration problems all need quick, accurate area conversion.
Conversion Formula
Every unit is converted to square metres first (the base unit), then divided by the target unit's square-metre equivalent:
Result = value in m² ÷ (target unit factor)
Common Conversion Factors
| Unit | Equal to (m²) |
|---|---|
| Square millimetre (mm²) | 0.000001 m² |
| Square centimetre (cm²) | 0.0001 m² |
| Square metre (m²) | 1 m² (base unit) |
| Square kilometre (km²) | 1,000,000 m² |
| Acre | 4,046.86 m² |
| Hectare | 10,000 m² |
| Square foot (sq ft) | 0.0929 m² |
| Square yard (sq yd) | 0.836127 m² |
Worked Example
A flat listed at 1,200 sq ft — what is that in square metres?
Now compare a 2-acre farm plot to hectares: 2 × 4,046.86 = 8,093.72 m², then 8,093.72 ÷ 10,000 = 0.809372 hectares — roughly 0.81 hectares, a conversion farmers frequently need for subsidy or loan paperwork.
How to Use This Calculator
- Enter the area value you want to convert.
- Select the unit you're converting from.
- Select the unit you're converting to.
- Click Calculate to view the instant result.
For sizing a room's flooring or paint needs, try the Flooring Calculator or Paint Calculator, both built on the same square-metre logic.
Area Units Across India
India's area-measurement landscape is famously inconsistent from state to state, which is exactly why this converter earns its keep. A Mumbai or Bengaluru apartment listing is almost always in square feet; a Punjab or Haryana farmer might quote land in "kanal" and "marla"; a Bihar or UP land record might use "bigha" or "biswa" (whose exact size varies by district); and a Gujarat or Rajasthan deal might use "vigha." Because bigha alone can mean anywhere from roughly 1,600 sq m to over 6,000 sq m depending on the region, always confirm the local conversion factor with a revenue office or lawyer before relying on a generic bigha-to-acre figure. This converter handles the standardised international units (m², km², acre, hectare, sq ft, sq yd) reliably; for regional units like bigha, kanal, or marla, cross-check with your specific state's land revenue department.
More Worked Examples
Scenario 1 — Comparing two plots in different units: A buyer is choosing between a 5,000 sq ft plot in one city and a 0.5-acre plot in another. Converting the acre figure: 0.5 × 43,560 = 21,780 sq ft — over four times larger than the first option, a gap that's easy to miss without converting both to the same unit first.
Scenario 2 — Agricultural subsidy paperwork: A farmer's landholding is recorded as 3.2 hectares on an old document but a new bank form asks for acres. 3.2 × 2.471 = 7.9 acres, a conversion needed before submitting a Kisan Credit Card or crop insurance application that specifies area in acres only.
Scenario 3 — Converting a small room for tiling: A bathroom measuring 6 ft by 4 ft needs its area in square metres for an imported tile brand's per-m² pricing. Area = 24 sq ft, then 24 × 0.0929 = 2.23 m² — multiply by the price per square metre to estimate total tile cost before ordering.
Area Converter vs Calculating by Hand
Area conversions are riskier to do manually than length conversions because the unit factors involve squared relationships — a small error in the linear factor gets squared too, doubling the mistake's impact. For instance, someone who mistakenly uses 3.28 (the linear feet-per-metre factor) instead of 10.764 (the correct square-feet-per-square-metre factor) will understate a converted area by roughly 70%. This is one of the most common manual-calculation errors in Indian real estate paperwork, where a small typo in the conversion factor can make a flat appear far smaller or larger than it actually is. Using a dedicated area converter avoids this squared-error risk entirely.
Common Mistakes to Avoid
- Squaring the wrong factor: Always use the area-specific conversion factor (e.g., 0.0929 for sq ft to m²), never the linear length factor, since area scales by the square of the linear ratio.
- Ignoring regional unit variation: A bigha in West Bengal is not the same size as a bigha in Rajasthan or Uttar Pradesh — never assume a national standard exists for these local units.
- Comparing carpet area to super built-up area: As noted above, these can differ by 20-30%, and no unit conversion fixes a comparison between two different area definitions.
- Forgetting boundary irregularities: Real plots are rarely perfect rectangles; a converted area figure from a deed should be checked against an actual survey measurement before making a purchase decision.
Frequently Asked Questions
Q: How many square feet are in one acre?
A: One acre equals 43,560 square feet. So a 2-acre plot equals 87,120 sq ft, a figure commonly needed when comparing a farmland listing to an urban plot quoted in square feet.
Q: What's the difference between carpet area, built-up area, and super built-up area?
A: Carpet area is the actual usable floor space within the walls; built-up area adds wall thickness and balconies (typically 10–15% more); super built-up area further adds a share of common spaces like lobbies and stairwells (often 20–30% more than carpet area). This converter only converts units, so always clarify which of the three figures a builder is quoting before comparing properties.
Q: How do I convert square yards to square feet for a plot in India?
A: Multiply the square yard figure by 9, since 1 square yard equals 9 square feet exactly (as 1 yard = 3 feet, and area scales by the square of the linear ratio). So a 200 sq yd plot equals 1,800 sq ft.
Q: How many acres are in a hectare?
A: One hectare equals approximately 2.471 acres. This conversion is frequently used by farmers and agricultural departments when comparing Indian land records (often in acres) with international or scientific data (typically in hectares).
Q: Can this calculator convert bigha or kanal to square feet?
A: Not directly, because bigha, kanal, marla, and similar units vary in exact size by state and even by district. This tool handles standardised units like m², acre, hectare, sq ft, and sq yd; for regional units, confirm the local conversion factor with your state's land revenue records before calculating.
📅 Last reviewed: July 2026 · Formulas verified against RBI/SEBI/IT Dept guidelines.