Maths & numbers

Point-in-polygon checker

Test whether a point lies inside, outside or on the edge of a polygon.

Point-in-polygon checker
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Your inputs

Use exact X,Y headings, without repeating the first point unless closing a polygon.

Up to 25 MB per file, 50,000 data rows, 200 columns and 2 million data cells. Fully blank rows and columns are ignored before row, column and cell limits are checked. Individual tools may have smaller result or chart limits.

Results update as you type. Larger files run when you press Update result.

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Your result

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Your result will appear here.

Your inputs stay in this browser. Nothing is uploaded or saved.

A clear answer. Here’s how.

Validates a simple 3–500-vertex polygon, then applies the even–odd crossing rule. Boundary points are reported separately using a distance tolerance of 10⁻¹⁰ × max(1, largest absolute coordinate). Coordinates must share one Cartesian system; no geographic projection is inferred. Near-boundary results depend on the tolerance. Includes a coordinate plot of the polygon and query.

See a worked example

Worked example

A fixed demonstration, separate from the values you enter above.

Point CSV
X,Y
0,0
4,0
4,3
0,3
Query point X
2
Query point Y
1

Example result

Point classification
Inside

Even–odd test with a scale-relative boundary tolerance. A point on an edge is reported separately.

Keep going.

Percentage calculatorConvex hull builderClosest pair in a point cloudPolygon centroid calculator