Land area calculator
Compute your parcel’s area from GPS coordinates or by drawing on the map, in any Arab coordinate system — in feddan, qirat, sahm, and m², with a rigorous geodesic area and the perimeter.
Area calculator
Click the map to add parcel vertices, or type coordinates in any of the 195 systems.
| # | Longitude | Latitude | |
|---|---|---|---|
| 1 | |||
| 2 | |||
| 3 |
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How we compute land area accurately
Computing a parcel’s area from coordinates looks trivial, but the correct method depends on the coordinate type. GPS coordinates (latitude/longitude on WGS 84) lie on an oblate ellipsoid, so the planar polygon formula does not apply to them directly. We therefore compute a geodesic area on the ellipsoid with Karney’s algorithm — the same engine PROJ/pyproj use — giving the true area on the ground, millimetre-accurate for short edges.
When your points are in a projected kilometric grid (Egypt’s Red/Blue belts, UTM, or Gulf systems), we also show the planar grid area on that system. It differs from the geodesic value by the scale factor squared, so we surface both honestly rather than hiding the gap. Results appear in m², in feddan/qirat/sahm using the official cadastral constants, and in hectare/dunum for regional use.
All of this runs in your browser with no data upload. For land registration, inheritance splits, and official approval, an estimate is no substitute for a certified field survey — which the GeoGiza team provides.
FAQ
- What is the difference between geodesic and grid area?
- The geodesic area is computed on the WGS 84 ellipsoid and is the true area on the ground. The grid area is computed on the projected metric plane and differs by the projection scale factor squared (k²) — up to a few parts per thousand depending on the system and location. We show both and recommend the geodesic value.
- Which coordinate system do I pick for GPS points?
- GPS latitude/longitude is WGS 84 — the default. If your points are in a national kilometric grid (Egypt belts, UTM, etc.), pick it from the list and the conversion uses the official EPSG parameters.
- How many square metres is a feddan?
- The Egyptian feddan = 4,200.833 m² = 24 qirat = 576 sahm. We use the official cadastral constants (not the rounded “4200”) and show the deed-style feddan/qirat/sahm breakdown directly.
- Is this calculator valid for land registration?
- No — it is for quick estimation. Official transactions and inheritance splits need a certified survey from a licensed office; the GeoGiza team provides this across Egypt and the Gulf.
- Are my coordinates uploaded to a server?
- All computation happens in your browser; your points are never uploaded. We only record an anonymous tally of the work-area centre (after you consent to tracking) to improve the tool.
You may also need: Distance & bearing calculator · Arab-world coordinate converter · Egyptian land-units converter · Scale factor & convergence · Distance & bearing calculator