Land Area Calculator

Work out a plot’s area from its sides — even irregular four-sided plots — in square feet, decimal (shotangsho), katha, bigha and acres.

Runs entirely in your browser. Nothing you type or paste is sent anywhere.

Shape of the plot

Measurements

Measured in

All lengths use this unit.

Length (ft)

Width (ft)

Area

Decimal · শতাংশ

5.51

Katha · কাঠা

3.33

Square feet · বর্গফুট: 2,400
Square metres · বর্গমিটার: 222.97
Bigha · বিঘা: 0.1667
Acre · একর: 0.0551
Hectare · হেক্টর: 0.0223

In bigha and katha: 3 katha 5 chhatak 15 sq ft (1 chhatak = 1/16 katha)

Sketch (to scale)

Drawn to scale from your measurements; north is not marked.

Local katha and bigha sizes

1 katha (sq ft)

1 bigha (sq ft)

Standard: 1 katha = 720 sq ft, 1 bigha = 20 katha = 14,400 sq ft. Local sizes differ in some districts, so change these to match your area. Saved on this device.

How it’s calculated: rectangle = length × width; triangle by Heron’s formula, √(s(s−a)(s−b)(s−c)) with s half the perimeter; trapezium = average of the parallel sides × height; four sides are split by the diagonal into two triangles; corner points use the shoelace formula.

1 decimal (শতাংশ) = 435.6 sq ft · 1 acre = 100 decimal = 43,560 sq ft · 1 hectare = 10,000 m² · 1 haat = 1.5 ft · 1 link = 0.66 ft · 1 chain = 66 ft. For buying or selling land, have the measurement confirmed by a licensed surveyor (আমিন).

More in Calculators & converters

Unit Converter

Length, weight, temperature, area (including bigha, katha and decimal), volume, speed, data and more.

Number to Words

Write numbers and Taka amounts in words in English (lakh and crore, or million) and Bangla — ready for cheques.