JoseFitani
🗂️ Map Generators

Radius Map

Draw a radius circle of any size around a point. Useful for delivery zones, coverage analysis and travel planning.

This page explains how the radius map works, the data and formulas behind it, and how to interpret the result. Map tiles come from OpenStreetMap, contributed by volunteers worldwide under the Open Database License. Leaflet is an open-source library for interactive maps that works on desktop and mobile. The tool is one of 329 free, open tools on JoseFitani for maps and geography. It runs in your browser with no sign-up needed. Use the search field or click the map to drop a pin - the tool uses Leaflet-based rendering with OpenStreetMap tiles and returns the result in seconds. Below you'll find a step-by-step guide, real use cases, the methodology, FAQs, and data sources.

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How to use this tool

1
Enter your input

Type your query, paste coordinates, or click on the map. The tool uses Leaflet-based rendering with OpenStreetMap tiles to process your input locally in the browser.

2
View the result

The result appears instantly with the map showing your location. You can adjust by clicking elsewhere or searching a new place.

3
Copy or share

Click Copy to save to clipboard, or Share to send a direct link with the exact inputs.

What people use this tool for

Defining delivery zones by distance

Small businesses can centre a circle on their shop and set an exact kilometre radius to show customers where they deliver. The numeric radius input keeps the zone honest — a 5 km circle means 5 km in every direction, not an eyeballed guess. Staff can check any address against the circle in seconds when an order comes in.

Example: A bakery in Pune sets a 7 km radius around its kitchen and only accepts online orders from addresses inside the circle.
Planning emergency response coverage

Fire stations, clinics, and volunteer rescue teams can draw a radius around their base to see which neighbourhoods fall within a target response time. Comparing circles of different sizes helps justify where a second station or an ambulance post is needed. The map view makes coverage gaps obvious at a glance.

Example: A rural clinic draws 10 km and 20 km circles around its building to show the district council which villages are beyond a reasonable response distance.
Scouting locations within a commute

House hunters and job seekers can centre a circle on an office or school and set their maximum acceptable commute distance. Every suburb inside the circle becomes the shortlist, and everything outside is ruled out without scrolling through listings one by one. It turns a vague 'nearby' requirement into a hard boundary.

Example: A nurse in Manchester draws a 12 km radius around the hospital to filter rental listings down to genuinely commutable areas.
Checking signal and service reach

Event organisers and small ISPs can visualise how far a transmitter, Wi-Fi hotspot, or PA system realistically reaches. The circle shows the theoretical coverage area, which teams then sanity-check against terrain and obstacles on the ground. It is a fast first pass before any site survey.

Example: A festival crew draws a 300-metre radius around the main stage to estimate where the PA will still be clearly audible across the field.

How it's calculated

The circle is computed as a polygon of points at the given distance along many bearings.

The calculation runs in your browser - no data is sent to our servers. Map tiles come from OpenStreetMap (ODbL license), geocoding uses Nominatim (1 request/second limit), and elevation uses the Open-Elevation API backed by SRTM data. All are free, open services.

All calculations use the WGS84 datum (EPSG:4326), the same as GPS. For other datums (NAD27, NAD83, ETRS89), a separate conversion is needed. The difference is typically under 1 metre - negligible for most uses but important for survey-grade work.

The formulas match those in professional GIS software (QGIS, ArcGIS, Global Mapper), just in a browser-friendly form. For sub-metre accuracy, use professional software with ellipsoidal calculations. Results are shown in multiple units: km and miles for distance, km²/m²/hectares/acres for area, metres and feet for elevation. Conversion factors are exact (1 mile = 1.609344 km), so the only error source is input precision.

Related tools and resources

For more tools in this category, explore the related tools listed below. Each tool includes full documentation, examples and FAQs. Explore related tools in our Maps category for complementary functionality. See the Tools index for all 329 tools, or read our blog for in-depth articles on geography and maps.

Frequently asked questions

Is the circle perfectly round on the map?

On a globe, yes. On web Mercator maps, polar regions look distorted.

What is the difference between Radius Map and Circle Map?

Radius Map centres a circle on a point you choose and lets you type an exact numeric radius, which suits zones defined by a fixed distance like a 5 km delivery area. Circle Map is for drawing and adjusting circles freely on the map for visual coverage analysis. Use Radius Map when the number matters and Circle Map when the placement matters.

Is the radius measured as straight-line distance?

Yes, the circle shows straight-line (as-the-crow-flies) distance from the centre point. It does not account for roads, rivers, or terrain that would change real travel distance. For drive-time or road-distance zones, use the Delivery Radius Calculator instead.

How large can the radius be?

You can set any radius size, from a few metres up to hundreds of kilometres. Very large circles will look distorted near the edges of the map because of how flat maps project a round Earth. For continent-scale analysis, a geodesic-aware tool gives truer shapes.

Can I draw circles around more than one point?

The tool is built around one centre point per circle, which keeps each zone's radius exact and readable. If you need several zones, note each centre's coordinates and draw them one at a time, or screenshot them together. Overlapping circles from multiple branches can reveal coverage gaps between locations.

Does the circle follow roads or natural boundaries?

No, it is a perfect geometric circle on the map and ignores roads, coastlines, and administrative borders. A delivery zone drawn this way may include areas across a river with no bridge. Always cross-check against real geography before committing to a service area.

Which units can I use for the radius?

You can enter the radius in kilometres or miles depending on what the tool offers at input time. The circle updates immediately when you change the value, so comparing a 5 km and a 10 km zone takes two keystrokes. Pick the unit your team already uses to avoid conversion mistakes.

Can I share or save the map I create?

The map is generated in your browser for the current session. Take a screenshot or note the centre coordinates and radius value to recreate it later. For anything customer-facing, like a delivery-zone graphic on a website, recreate the final version in your own design tool for a cleaner result.

Is the circle accurate enough for legal boundaries?

It is accurate as a visualisation, but it is not a surveyed boundary and carries no legal weight. Service areas, franchise territories, and regulated zones need proper GIS or legal documentation. Use this tool for planning and communication, then formalise boundaries through the right professional channel.

Data sources & methodology