Plot Area Calculator (3-Sided / Triangular)

Pro tips most people learn the hard way

• Triangles are the only plot shape where three side lengths give you an exact area — Heron's formula is 2,000 years old and still mathematically perfect. This is why surveyors break every irregular plot into triangles before measuring. Trust the number this calculator gives you, but only as far as your tape-measure accuracy.
• Triangular plots in Pakistan typically sell 5 to 15 percent below the equivalent rectangular plot's per-Marla rate, because the buildable rectangle inside the triangle is smaller. If the dealer's discount is less than that range, you are overpaying. If it is more, and the architect can use the angle creatively, it is often a steal.
• The triangle inequality is non-negotiable: each side has to be less than the sum of the other two. If the calculator warns you about invalid measurements, do not override — go back to the plot with a fresh tape. One wrong side length is the single most common measurement error.
• Corner triangular plots with two street frontages are premium real estate for retail, restaurants, showrooms, and dental clinics — visibility from two roads is worth a 20 to 30 percent commercial premium even when the same plot would be discount-priced as residential.
• Always pick the right Marla size before reading the area conversion. DHA and modern schemes use 272 sq ft per Marla. Some older Punjab and Karachi neighbourhoods use 250 or 225 sq ft. A wrong Marla setting gives you a number that will not match the registry document — and that is a hard argument to win at the Patwari counter.