How this calculation works
Enter the components separately instead of treating a punctuation-separated record as a decimal. Excess minor units are carried into major units, with normalized output and comparable square-foot, square-metre, cent, gunta and acre values.
Area = major units × major factor + minor units × minor factor + any square-metre remainderA worked example
1 acre plus 20 guntas is 1.5 acres, or 65,340 sq ft. By contrast, 1.20 decimal acres is 52,272 sq ft. The two notations do not describe the same area.
Good to know
Arithmetic using entered measurements and explicit unit definitions. Not a boundary survey, title check, valuation, planning approval or determination of legal shares.
Reference: API Setu MDDS: acre/cent and acre/gunta relationships (opens in a new tab) ↗
Check the land-unit definitions and sources
The standard factors use the international foot and an acre of 43,560 sq ft. Cent means 1/100 acre; gunta means 1/40 acre; the selected Chennai ground means 2,400 sq ft.
The Assam report defines bigha as 14,400 sq ft, katha as 2,880 sq ft and lecha as 144 sq ft. The cited West Bengal court order mentions a 720-sq-ft katha convention. These are explicit presets, not an automatic definition for every record or every place using the same name. Match your record to the stated convention, or use its verified custom factor.
- NIST: exact international-foot and acre factors (opens in a new tab) ↗
- API Setu MDDS: acre/cent and acre/gunta relationships (opens in a new tab) ↗
- Greater Chennai Corporation: one ground is 2,400 sq ft (opens in a new tab) ↗
- Government of Assam AIRBMP framework: section 7.2, page 28 (bigha, katha and lecha) (opens in a new tab) ↗
- Supreme Court order, 7 May 2025: paragraph 2, page 2 (West Bengal katha) (opens in a new tab) ↗
The acre relationships are converted using exact base factors. Rounded or unrelated regional values in a reference table are not substituted for these definitions.
Separate components prevent a decimal-place mistake
Imagine a record that you have confirmed means one acre and twenty guntas. Its fraction of an acre is 20/40, so the total is 1.5 acres. Typing 1.20 into a decimal-acre converter instead describes 1.2 acres. The difference is 0.3 acre, or 13,068 sq ft.
This page deliberately asks for the components separately. It does not guess what a dot, dash or space means in a particular document. Read the record’s column headings and notation before selecting an input format; a portal’s display conventions can differ from an ordinary decimal.
For hectares, ares and square metres, a hectare is 100 ares and an are is 100 m². Entering 1 hectare, 25 ares and 50 m² therefore gives 12,550 m². Here a fractional are is permitted; an extra square-metre component can be added explicitly.
Normalization changes the writing, not the total
One acre plus forty-five guntas normalizes to two acres plus five guntas. Similarly, one hectare plus 105 ares normalizes to two hectares plus five ares. The displayed carry makes it easier to spot an input that accidentally placed a whole major unit into a minor column.
One acre plus twenty cents is 1.2 acres because cents use a hundredth, while the same numbers in acre-plus-gunta mode give 1.5 acres. Always read the selected minor unit beside the number rather than relying on how familiar the notation looks.
After reading a mixed extent, the India land area converter can express its total in another unit. Keep any unrounded source quantity available when copying results; repeated rounding between units can produce small apparent mismatches.
A few questions, answered
Can I put 1.5 into the whole-acre field?
No. That field is a whole major-unit count. Use 1 acre plus 20 guntas, or enter 1.5 acres in the ordinary land converter.
Are more than 40 guntas rejected?
No. They are carried into whole acres. This is a normalization operation, not a validation of the original record.
Does this parse a Maharashtra 7/12 extract?
No. It performs the selected component arithmetic. Identify what the particular columns and decimal punctuation mean before entering the components.