Land Area Calculator (Decimal & Sqft)

Calculate the approximate area of a land plot using the lengths of its four sides.

Calculator image
ft

Enter the length of the first side.

ft

Enter the length of the second side.

ft

Enter the length of the third side.

ft

Enter the length of the fourth side.

Area (in Decimal)

N/A

Total land area in Decimal units. 1 Decimal = 435.6 sq.ft

Area (in Sq.Ft)

N/A

Total land area in square feet (approximate).

How to Calculate Land Area from 4 Sides?

This calculator estimates the area of a four-sided land plot using an approximate formula for irregular quadrilaterals. When only the lengths of all four sides are known, we use the simplified version of Brahmagupta’s formula for convex quadrilaterals:

  • Formula Used: Area = √((s - a)(s - b)(s - c)(s - d)), where s is the semi-perimeter (a + b + c + d) / 2
  • Area in Decimal: Decimal = Area (in sqft) / 435.6

Example: For sides 40 ft, 50 ft, 45 ft, 55 ft:

s = (40 + 50 + 45 + 55)/2 = 95

Area ≈ √((95 - 40)(95 - 50)(95 - 45)(95 - 55)) = √(55×45×50×40) ≈ 15748.02 sqft

Decimal ≈ 15748.02 / 435.6 ≈ 36.15

References: