Radius Finder
Enter a location and drag the slider to draw a radius circle on the map. See the coverage area in km² or square miles. Click anywhere on the map to move the center.
1 km500 km
Click anywhere on the map to move the center point
Frequently Asked Questions
- Is this radius finder free?
- Yes, 100% free with no account required.
- What is the maximum radius I can draw?
- The slider goes up to 500 km (310 miles). For larger areas, type a value manually in the radius input.
- Can I move the center by clicking on the map?
- Yes — click anywhere on the map to move the center point to that location. The radius circle will redraw instantly.
- How is the area calculated?
- Area = π × r² where r is the radius. This gives the flat-surface approximation, accurate for most practical use cases. For very large radii (> 1000 km), spherical geometry would differ slightly.
- Can I switch between km and miles?
- Yes — toggle between km and miles using the unit switcher. The radius, area, and circumference all update instantly.
- What can I use this for?
- Delivery radius planning, service coverage maps, emergency response zones, real estate search radius, travel distance planning, and more.