Radius Map Calculator

Check the boundary before using it

A radius measures straight-line distance. Roads, rivers and limited-access crossings can make a location inside the circle slow or impossible to reach by the intended route. A delivery or commute decision needs an actual route and travel-time check.

If an official notice specifies a center and distance, reproduce those values here, then compare with the notice’s own boundary or parcel list. The map does not determine legal inclusion or replace a survey.

Choose the center that matches the question

Delivery and on-site service

A business that delivers or provides on-site service within a fixed distance can draw that boundary directly on the map, then inspect which neighborhoods, towns or landmarks fall inside it. This is a visual planning aid, not a routing engine: it shows a straight-line boundary. Check bridges, private access and the actual route before quoting a delivery or promising a visit. A point inside the circle can still require a trip outside it.

Real estate and commuting

Center the map on a workplace, school or address and draw a radius to see what falls within a given straight-line distance, as a first pass before narrowing a home search to specific neighborhoods. Actual commute time depends on real roads and traffic. Keep the circle as an initial distance filter, then check the specific journey at the relevant time rather than assigning one travel time to the entire disk.

Coverage, permit and evacuation notices

Some notices describe a fixed radius from a point, such as a construction notification boundary or an evacuation zone. Enter the center and distance stated in the notice, including its units. A city name places an approximate center; it does not identify a particular parcel or the legal extent of a zone. Where the notice includes its own map, street list or parcel boundary, use that authoritative description to resolve inclusion.

Reopen the same circle

“Copy share link” puts the center coordinates, radius and unit into the URL. Sending that URL lets another reader reopen the chosen circle without an account or saved project. Test the copied link before distributing it, and inspect the marker after reopening. The coordinates are part of the shared information; a link centered on a home or other sensitive place discloses that position.

Understand the square units

For an assumed ten-mile radius, the planar circle area is π × 10², about 314.2 square miles or 813.7 square kilometers. A twenty-mile radius gives about 1,256.6 square miles, four times as much. These figures count surface area under the displayed formula, not residents, addresses, customers or reachable roads. Demographic counts need separate data and a defined geographic boundary.

Reference

Radius, diameter and area for common distances

References: NIST length units; Nominatim search API; OpenStreetMap data attribution.

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