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Plot Area Calculator (2026) – All-in-One Land Measurement

Expert Guide
Babu

Calculate multi-point irregular plot areas using GPS, Triangles or Rectangles.

Professional land surveying of a residential plot area with measuring tools

⚡ Quick Answer

To find the exact square footage of any land parcel—rectangular, triangular, or irregular—simply input the side measurements. For professional plot layouts and map approvals, visit pro.nirmansutra.com.

🛠️ How It Works

  • •Select your plot shape (Rectangular, Triangular, or Irregular).
  • •For irregular plots, you MUST measure at least one diagonal (A-C) to fix the geometry.
  • •The tool uses Heron’s formula to calculate the exact area of the triangles forming your plot.
  • •Results are instantly converted into Nepal local units.

📐 Calculation Formula

Rectangle Area = Length × Width
Heron's Formula (Triangles) = √[s(s-a)(s-b)(s-c)]
where s = (a + b + c) / 2
Irregular Land Plot Survey & Area Calculation Diagram

📋 Real-Life Example

Example: Irregular Plot (Sides: 50ft, 40ft, 45ft, 35ft with 60ft diagonal). 1. Triangle 1 (50, 40, 60) ≈ 992 sq.ft. 2. Triangle 2 (45, 35, 60) ≈ 780 sq.ft. 3. Total Area ≈ 1,772 sq.ft (approx 5.18 Aana in Kathmandu).

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⚡ Local units supported

Convert any land area between Nepal's traditional units (Ropani, Bigha) and global standards. See Plot Area Tool for mapping.

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⚠️ Common Mistakes to Avoid

  • ✕Measuring only 4 sides of an irregular plot; without a diagonal, the area is mathematically undefined.
  • ✕Forgetting to deduct area for public roads or setbacks required by municipal bylaws.
  • ✕Using a rough tape measure that sags over long distances, causing a cumulative error in total square footage.
  • ✕Assuming the plot is a perfect rectangle when corners are actually slightly acute or obtuse.

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❓ Frequently Asked Questions

A 4-sided irregular plot is not geometrically fixed by sides alone. A diagonal splits it into two fixed triangles, allowing Heron’s formula to calculate the unique and accurate area.
In the Nepal Hill system, 1 Ropani = 16 Aana. Each Aana equals 342.25 square feet.
In the Nepal Terai system, 1 Kattha equals 20 Dhur, which is 338.63 m² or approximately 3,645 square feet.

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