Add Radius

Radius Center Point Choose one of:

1) Use the radius drawing tool on the map

2) Place radius by location name :  Draw Radius 

3) Input Coordinates : Latitude Longitude (decimal)  Draw Radius 

4) Draw radius at your location  Current Location 

Colors and Line Thickness

Fill Color:
No Fill:

Line Color:

Line Thickness:

Map Options

 Zoom to Fit Map 

 Clear Last 

 Clear Map 

Show center marker?

Input

CSV Upload [latitude,longitude,radius(km),label(optional)] per line

latitude,longitude,radius(km) For Example... 51.538611,-0.016389,10

 Upload 

Click Here to Show/Hide CSV Upload Panel

Output

Circumference of last circle km miles

Area of last circle km² acres

Latitude / Longitude of center of last circle

URL to last radius

Google Maps Static API Image Output

Step 1 : Get the map above to look as you wish (pan/zoom/radii)

Step 2 :  Generate Your Static Map Code

Google Earth KML Output

Once you have a radius on the map :  Generate KML

Instructions

1. Type in a radius required in the text box above.
2. [Zoom and Pan to find the required area on the map then click on the map to draw a circle] OR [Type a location into the text box and click Draw Radius] OR [Input the latitude and longitude of the location in decimal format].
3. Click as many times as necessary to draw multiple circles.
4. You can use the [Clear Map] button to erase all markers and radii and start again.

Use the "URL to last radius" text box to find a URL that will show the most recent radius on this page when opened in a web browser. This URL can be sent to anyone if you wish to forward it on.

Google Earth KML Output

You can now export all the drawn radii on the map to Google Earth for improved display and printing. You must have Google Earth installed (or another application capable of importing KML files). You need to have a radius displayed on the map before the output will work. Please report any bugs.

The procedure to Export to KML is as follows:

1. Draw one or more radii on the map as you see fit
2. Once ready, click the [Generate KML] button. You will probably need to scroll down the page to find this!
3. After a short delay, the KML file with download
4. You can then open the KML file in application such as Google Earth

Currently, the KML will include:

1. The same radius size and shape
2. Transparency of 50%

It will not include:

1. Shading colour (blue only, but you can change this once it is loaded into Google Earth)
2. Line colour (you can change this once it is loaded into Google Earth)
3. Line thickness (you can change this once it is loaded into Google Earth)

These features may be added later depending on feedback.

CSV Upload

The CSV option allows you to upload bulk points to the map. To do this you must format your points using the convention of latitude,longitude,radius per line where latitude and longitude are in decimal format and radius in km. Make sure to strip out any whitespace. You can upload as many lines as you wish, however more lines will take more time and every web browser will have its limits on the maximum number of lines (hence circles drawn) before things slow to a halt.

For Example...

51.538611,-0.016389,10
51.538611,-0.016389,15

..should add two radii around the Olympic stadium in London for 10km and 15km

Future Ideas

• Ability to input nautical miles
• URL link includes settings to show/hide the radius centre marker and resize grip
• URL link to include the data for multiple radius
• Ability to customise the center marker

Version History

• 19th July : Added function to click on map to draw radius
• 20th June 2023 - Bug Fix : Radius text box would sometimes update with a different value after radius is drawn
• 13th June 2023 - Bug Fix : KML Download
• 13th June 2023 - Bug Fix : Marker did not move if radius location was changed
• 13th June 2023 - Converted to Leaflet Maps
• 18th February 2018 - User settings are stored between settings. Radius, map type, fill color, line color and line thickness
• 11th October 2017 - KML output now includes the label (if defined) for each radius
• 2nd March 2017 - KML output now includes fill and line colours for each radius
• 2nd November 2016 - New CSV Output panel displays parameters of all radius drawn
• 31st October 2016 - New button to draw radius at current location
• 19th August 2016 - Bug fix : URL for multiple radius didn’t appear when only drawing radius by place name
• 21st July 2016 - URL is now available for all radius drawn
• 25th February 2016 - URL now contains information about the map type so you can load the radius with different map types
• 4th May 2015 - Update to allow a resize after using method 2 or 3 to recalculate the Radius Distance
• 7th May 2013 - 2 new options added : URL loads full screen? AND URL loads unclickable map?
• 13th January 2013 - Label on marker now displays radius. You can now annotate markers.
• 15th February 2012 - Updates to layout of options
• 8th January 2012 - Added search for location text box
• 7th January 2012 - Resolved issue where the specified fill colour was not used if the draw by address or latitude/longitude was used
• 22nd December 2011 - Added full screen option. Fixed issue when dragging the centre point of a smaller radius
• 15th September 2011 - Added option to upload CSV text for bulk upload of multiple points
• 13th June 2011 - Fixed issue with clear fill having the same colour as the previously selected colour
• 7th June 2011 - Option to hide the resize grip
• 3rd June 2011 - Radii can now be resized while onscreen
• 23rd May 2011 - Radii can now be clicked to be drawn inside an existing radius
• 10th May 2011 - Static map output now uses Google Static Maps API V2. No key required. Will not output an URL > 2048 characters
• 9th May 2011 - Fixed issue with clear fill having a grey shade
• 15th April 2011 - Allow the last radius to be deleted (not just all at once)
• 3rd February 2011 - Export to KML now copes with multiple radii
• 20th January 2011 - Circumference and area now also output in miles and acres
• 29th December 2010 - Click on a marker to delete it
• 29th December 2010 - Allow markers to be dragged
• 29th December 2010 - Converted to Google Maps API V3
• 2nd June 2010 - Moved the scale control to the top of map to stop conflict with Google Search bar
• 27th January 2010 - Added Google Earth KML Output
• 13th October 2009 - Overlapping radii now supported
• 29th September 2009 - Added Google Search Bar to map. Added radius display on marker when you hover over the marker
• 24th September 2009 - Added URL to last radius function
• 17th September 2009 - Added Google Maps Static API Image Output
• 3rd January 2009 - Added latitude and longitude input option
• 29th September 2008 - Added clear fill option
• 9th September 2008 - Added Place radius by location name option and reworked some other functions
• 21st January 2008 - Improved circle reliability and added fill colour
• 15th October 2007 - Added area and circumference output
• 25th September 2007 - Added different colour's, change thickness, show/hide center marker, change map height and print the page
• 13th September 2007 - Now works with IE
• 22nd July 2008 - Added option to use miles as radius input
• 30th June 2007 - Clear Map button added
• 29th June 2007 - Page created with basic functionality

I keep coming back hoping this has improved, but it's still garbage
On 27th September 2023

v poor
On 27th September 2023

After you switched to OpenStreet Maps, this utility is not very useful. When you draw circle you never know what the R is. Before you could see R and other data as you draw. It is a mess now.
On 16th September 2023

The radius does scale correctly when you get close to the north and south poles
By Brett on 12th September 2023

Very cool :thumb up:
On 7th September 2023

We used to use this tool to adjust circles on a map, but now we can't dynamically edit the radius and center position of the circles once placed.
By Alexandre Simoneau on 28th August 2023

Flawed Totally incorrect radius being shown requested 4.4 miles More like <1km
On 21st August 2023

Still don't understand the reason for the absolute downgrade
On 21st August 2023

Ughh this is such a downgrade from the old version!! :(
By Troy on 14th August 2023

Akhil, that name is static so cannot be changed.
By Free Map Tools on 19th July 2023

While uplodating layer on Google earth, the circle name changed as "Radius" how should to change this?
By Akhil on 18th July 2023

Why cant I just click on the map to see a circle of a predetermined radius? This used to work fine.......
On 12th July 2023

When editing the radius of an existing circle by dragging the radius handle, there is no obvious way to see how big you're making the new radius. There is a nice label when creating a new radius, but that is not present when editing.
On 10th July 2023

Works install on Google Earths perfectly.
By Beto Lima. on 10th July 2023

Completely unusable after update, new map draws as if the Earth is flat rather than round, therefore distances are not correct at all
By Andrew on 8th July 2023

Very good update! Would it be possible to include a feature that allows us, when we modify the radius of a circle with the handle, to know the radius of the new circle?
By MV on 30th June 2023

Unusable after the updates if I just can't click on the map to add the circle with a predefined radius. Are you going to fix this?
On 28th June 2023

atarijedi, thanks. This should now be fixed.
By Free Map Tools on 20th June 2023

Awesome Tool, I use it often, having 1 tiny issue though. I noticed that the input box for the distance is attaching 3 zeroes after I click draw radius, so it seems to be turning the number, just in the input box, into meters. If I type in 3000 km, and hit draw radius, it draws the right circle size, but the number says 3000000 km.
By atarijedi on 19th June 2023

Pete, an update has been made to allow this. There is a new option for No Fill
By Free Map Tools on 14th June 2023

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