Plot Area Calculator (5-Sided / Pentagonal)

From the editors — what to know before you start

Pentagonal plots are the awkward middle child of Pakistani real estate — too irregular for a standard 4-sided calculator, too common to ignore. They appear at three-road junctions where the corner has been chamfered for traffic visibility, at irregular T-junctions in older settlements, in housing schemes with non-grid master plans, and on agricultural land where a canal or natural slope cuts one edge at an angle. Five side lengths alone do not give you an exact area — pentagons can flex into infinitely many shapes with the same sides — so this calculator uses the cyclic-polygon method: it computes the area as if all five corners lay on a single circle, which gives the maximum possible area for those sides. For nearly-regular pentagons (sides within 15 percent of each other), the estimate lands within 2 to 4 percent of the true area. For highly irregular pentagons with one dominant side, it can overestimate by 8 to 10 percent. Honest take: use this for initial valuation and to check the dealer's claimed Marla figure. For the final legal transaction, demand a Patwari-certified demarcation with diagonals measured — that triangulation gives an exact area and is what any property dispute will be decided on. Pentagonal corner plots with three street frontages often outperform nearby rectangular plots on a per-Marla basis when used for retail or restaurant — the visibility premium can flip the discount into a premium.