Our Methodology – How We Calculate
How conversion factors are prepared, and when to verify with an official source.
Two Kinds of Units
Every conversion on this site falls into one of two categories, and it matters which one you're working with:
1. Internationally Standardized Units
Hectare, Acre, Are, Square Meter, and Square Foot are defined by fixed, universal mathematical relationships — they mean exactly the same thing everywhere in the world. For example, 1 Hectare is defined as exactly 10,000 square meters, and 1 Acre is defined as exactly 4,046.8564224 square meters. These conversions carry no regional uncertainty; the only thing that can vary is how many decimal places you round to.
2. Regionally Variable Indian Units
Bigha, Biswa, Guntha, Cent, Dismil, Kanal, Marla, and Gaj are traditional land units that predate metric standardization in India. Some of them (Guntha, Cent, Dismil) are defined as clean fractions of an Acre and so are consistent everywhere they're used. Others — most notably Bigha — were historically set locally by each region and were never fully standardized nationally. As a result, 1 Bigha in Uttar Pradesh (about 2,025 sq. m) is a very different size from 1 Bigha in Assam or West Bengal (about 674 sq. m), and Rajasthan additionally distinguishes between "Pakka" and "Kachha" Bigha.
Where Our Figures Come From
The conversion factors used across this site reflect standard values commonly published by Indian state revenue departments, land-record (Bhulekh) portals, and widely cited agricultural references. We do not claim these figures come from a single authoritative national source — because, for regionally variable units, no single national source exists. Where a figure is genuinely uncertain or disputed, we say so rather than presenting a single number as universally exact.
How We Test Our Calculators
Each calculator's formula is checked against its stated conversion factor before publishing, and conversion tables are generated directly from the same underlying factor used by the calculator, so the calculator and the reference table always agree with each other. If you find a mismatch or a value that looks wrong, please report it — see below.
How Corrections Are Handled
HectareCalculator.com is written and maintained by Aabeed Gehlod. If you report an incorrect value through our Contact page, it is reviewed personally against publicly available reference sources and the figure is updated if a correction is warranted. See our Editorial Policy for the full correction process.
When You Should Verify With an Official Authority
This site is built for quick estimation, learning, and everyday reference — not as a substitute for an official land record. Always verify the exact area with your local Patwari, Tehsildar, or your state's official Bhulekh/land-records portal before:
- Buying or selling land or property
- Submitting figures for a bank loan or mortgage
- Applying for a government scheme (e.g. PM-KISAN)
- Any legal proceeding involving land area