Point in Polygon Calculator

How to use Point in Polygon Calculator

Validate the ring for duplicate vertices, backtracking and nonadjacent intersections. Exact-grid segment predicates identify boundary points; a winding count handles either ring orientation without approximating edges by slopes.

1. Enter json ordered polygon vertices, json query points.
2. Choose the stated convention and check the units and supported model.
3. Calculate, inspect the result, then copy or download it.

Good to know

• 3–500unique ring vertices, optional repeated closing point,1–1000queries. Holes and self-touching/intersecting rings unsupported. Planar coordinates are parsed to a fixed6-decimal grid, magnitude at most1million; exact BigInt orientation/classification on that declared grid. No arbitrary precision beyond it, map projection or GIS/navigation certification.
• Runs locally. Text/JSON fields are capped at30,000 characters; stricter page-specific and numeric-string limits also apply. Numeric inputs are bounded to magnitude1e15 and nonzero magnitude at least1e-100 unless an exact-string mode states otherwise. Approximate summaries use12 significant digits; CSV numeric cells retain the complete stored value and potentially formula-like string cells gain a protective apostrophe; unsupported, non-finite or detected underflow states return an error.