Katha, Bigha and Shotok: The Land Conversions You Actually Need
The seller quotes katha, the deed says shotok, and your uncle says bigha. Here are the conversions, a full table, and the regional differences that catch people out.
Area and Plot Measurement
Measure land by tapping corners on a satellite map, convert between Katha, Bigha, Decimal and Acre.
About Area and Plot Measurement
Area and Plot Measurement is a land area calculator built for how land is actually measured in South Asia. Tap the corners of a plot on a satellite map and the boundary and area are calculated in real time — no walking the perimeter with GPS, no surveying training.
It handles the units people actually use: Katha, Bigha, Decimal, Acre and square feet, with instant conversion between all of them. The entire interface is available in both English and Bengali.
Screenshots
Key features
- Measure by drawing on the mapTap each corner of your land on a satellite or street map and the app draws the boundary and calculates the exact area as you go.
- Calculate by shape and dimensionsAlready have the numbers? Enter a rectangle's width and length, a triangle's base and height, or any number of vertices for an irregular polygon.
- South Asian land unit converterKatha, Bigha, Decimal, Acre and square feet — enter one value and see it in every other unit at once.
- Saved calculations and historySave any measurement with a custom name and notes, mark favourites, and keep a full record with area, unit and date.
- Google account syncSign in to back up saved calculations to the cloud so a lost or reset phone does not lose your measurements.
- Full English and Bengali supportEvery screen, button and message is translated. Switch language any time from the menu.
Who it's for
- Farmers measuring agricultural fields
- Land buyers verifying a plot before purchase
- Real estate agents and property dealers
- Civil engineers and surveyors needing quick on-site estimates
- Families dividing or inheriting land
- Geography, agriculture and civil engineering students
Built with
- Flutter
- Dart
- Google Maps SDK
- Firebase Auth
- Cloud Firestore
Want an app built on this stack? See how I work or get in touch.
Frequently asked questions
Do I have to walk around the land to measure it?
No. You tap the corners of the plot on the satellite map and the area is calculated from those points. You can do it from anywhere.
Which land units are supported?
Katha, Bigha, Decimal, Acre and square feet, with instant conversion between all of them.
Is the app available in Bengali?
Yes. The full interface is translated into Bengali and you can switch languages from the menu at any time.
Will I lose my saved measurements if I change phones?
Not if you sign in with your Google account — saved calculations are backed up to the cloud and restored on your new device.
How accurate is the map measurement?
Accuracy depends on how precisely you place the corner markers on the map. For most agricultural and property use it is well within practical tolerance, but it is not a substitute for a legal cadastral survey.
Further reading
How to Measure Land Without a Surveyor
Four ways to get the area of a plot yourself, what each one is good for, and where each one goes wrong. Use them to screen plots — then pay an amin for the one you buy.
Why the Land You're Buying Measures Smaller Than the Deed Says
The deed says 10 shotok. You measure 8.6. Before assuming anyone is lying, here are the five reasons that gap appears — and how big a gap should actually worry you.
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