How to Draw a Radius on Google Maps (and Free Map Radius Tools)

Google provides a separate web application called Google My Maps (mymaps.google.com) that allows users to create custom layers, drop custom pins, and draw polylines and freehand polygons. While Google My Maps does not have an automatic "Insert Radius" tool, you can import third-party KML circle files.

Here is the step-by-step process:

If you do not want to download external KML files or juggle multiple tabs, dedicated web tools like GeoMap Suite Map Radius Tool provide a streamlined, zero-friction workflow:

Most web mapping platforms (including Google Maps, Leaflet, and MapLibre) use the Web Mercator projection (EPSG:3857). While Web Mercator preserves conformal angles (making city street intersections appear square), it severely inflates land area and distances as you travel away from the Equator toward the North and South Poles.

If a mapping tool naively computes a circle in flat pixel coordinates on a Web Mercator projection, a 10-mile circle drawn in Minneapolis or London will represent a drastically different physical ground distance in the east-west direction than in the north-south direction. To provide authentic geographic accuracy, a radius tool must calculate 64 or 128 discrete polygon vertices using ellipsoidal geodesic trigonometry on the WGS84 ellipsoid. At high latitudes, an authentic geodesic circle appears slightly flattened or egg-shaped on a Mercator map—reflecting true physical ground distance.

When planning sales territories or delivery boundaries, knowing the total enclosed land area inside your radius ring is essential for calculating customer density and logistical feasibility:

For a 5-mile radius: - Circumference = 2 \times 3.14159 \times 5 = 31.42\text{ miles} - Land Area = 3.14159 \times 5^2 = 78.54\text{ square miles} (50,265.5 acres)

For a 10-mile radius: - Circumference = 2 \times 3.14159 \times 10 = 62.83\text{ miles} - Land Area = 3.14159 \times 10^2 = 314.16\text{ square miles} (201,062.4 acres)

Notice that doubling the radius from 5 miles to 10 miles results in four times the total land area (from 78.54 to 314.16 square miles). This geometric law (the inverse-square principle) is why delivery operations and service businesses find their operational costs expand rapidly beyond 5-mile zones.

Radius mapping is widely utilized across commercial, government, and consumer domains:

Here is how each option compares across key spatial analysis capabilities: