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Land area converter
Bigha, katha, marla, kanal, guntha, cent, ground and gaj. Asks the state first, because bigha is not one number.
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Bigha and katha change meaning from state to state, so pick the state first. That single detail is where most online converters go wrong.
Bigha has no single national definition. It runs from about 6,800 square feet in parts of Uttarakhand to over 27,000 in Uttar Pradesh and Bihar. If a document quotes bigha without naming the district, treat the number as unconfirmed until somebody checks the local record.