Tools Distance, area and drive time
Map Radius Tool
Type a place or click the map, set a radius, and a true geodesic circle is drawn. Add more circles to compare service areas or delivery zones.
How to use it
- Type an address, city or ZIP code, or click anywhere on the map to set the centre.
- Enter a radius or tap one of the preset distances, and choose miles or kilometres.
- Press Draw circle. Repeat with other centres or radii to stack up to five circles.
- Read the radius, diameter, circumference and area under the map, and export as GeoJSON or KML.
How it works
Each circle is a geodesic: 128 points placed at the chosen distance from the centre along great circles, so the shape is correct on the ground even where the flat map stretches it. Area and circumference are computed on a sphere of radius 6,371 km in the browser; nothing is sent anywhere.
Place search uses the Photon geocoder on OpenStreetMap data, and a click on the map is reverse-geocoded through Nominatim to name the centre. The circles are stored in the page link so it can be shared.
Questions
- How do I draw a 10 mile radius on a map?
- Type the centre address, tap the 10 preset with miles selected, and press Draw circle. The circle and its area appear at once, and the page link now contains the circle.
- Is the area of a 5 mile radius circle really 78.5 square miles?
- Yes, pi times 5 squared. The tool reports 78.54 square miles, and the tiny difference from a flat-paper circle is the curvature of the Earth, which only matters for very large radii.
- Can I draw several radius circles at once?
- Up to five. Each gets its own colour and its own row of figures, and you can remove any one of them.
Related tools
All map tools, free and without an account. Location data is processed in your browser and by the open geocoding services named on the sources page; nothing is stored by this site.