GPS Land Area Calculator

Field guide: GPS Land Area Calculator

Walk the boundary, tap 📍 at each corner, and the area computes instantly — the shoelace formula applied to your GPS points on a local projection centered on the plot, which keeps the math honest for parcels from a courtyard to a large farm. Results appear simultaneously in the units land is actually discussed in: hectares and acres for documents, bigha/gunta/gaj for the conversation at the boundary, square feet for construction, plus the perimeter for fencing estimates.

Accuracy expectations should be set honestly: phone GPS gives 3–5 m per corner in open sky, which lands a 1-acre plot within a few percent — excellent for planning, fencing quotes, fertilizer math and sanity-checking documents, but no substitute for a licensed survey where boundaries are disputed or money changes hands on the digits. Capture corners standing still for a few seconds, and walk the boundary in order (the polygon connects your points in sequence).

Field tips

• Stand still 5–10 seconds at each corner before capturing — phone GPS settles noticeably after movement stops.
• Capture corners IN ORDER around the boundary (either direction) — crossing the plot mid-sequence creates a self-intersecting bow-tie polygon and nonsense area.
• For best accuracy go corner-hunting in open sky hours — tree canopy and adjacent buildings can double GPS error.

Records are stored only in this browser (localStorage) — export regularly. This tool aids field documentation; it does not replace your agency's official inspection procedures or engineering judgment.