Area Calculator

This planimeter tool can be used to measure the enclosed area of a defined polyline on a map.

Measure an Area

Search For Location :


Area Output

0 m²
0 km²
0 Acres
0 Hectares
0 Feet²

Perimeter Output

0 m
0 km


 Delete Last Point 

 Delete All Points 

 Start a New Area 

Show Markers?
Transparent Fill Colour?
[Map Height : Small - Medium - Large - Full Screen]

Read KML (Beta)

Upload KML File:



To use the area calculator tool:

  • Zoom and pan the map to find the area of interest
  • Click on the map to place a vertices for the polyline
  • Click as many time as necessary to define the polyline

The area enclosed will them be output in square meters and square kilometers

You can click the [Delete Last Point] button if you make a mistake or click [Clear All] points to remove all points from the map and start again.

You can also reposition the markers after they have been placed on the map by dragging and dropping them.


The area calculator tool allows you to find out the area that is enclosed inside a closed polyline overlaid on a map.


Lough Neagh

A measurement of Lough Neagh in Northern Ireland. Lough Neagh is reported to have a surface area of 388 km² [1] , so the reading of 380 823 442m² isn't far off.

Future Uses and Ideas

  • Allow the user to change the colour of the polylines and area shading (including transparent)
  • Allow the area to be saved for later use

Version History

  • 23rd March 2014 - Added Hectares output
  • 6th August 2013 - Issue with perimeter output fixed
  • 21st February 2013 - Added square feet output
  • 8th January 2012 - Upgraded to Google Maps API V3 and some new features
  • 20th July 2010 - Added crosshairs and option to switch on/off crosshairs
  • 17th June 2010 - Added upload KML option (beta)
  • 2nd June 2010 - Moved the scale control to the top of map to stop conflict with Google Search bar
  • 2nd February 2010 - Added perimeter output in meters and kilometers
  • 25th March 2008 - Draggable markers, ability to click inside polygon and output in acres added
  • 26th June 2007 - Basic area calculation added
  • 24th June 2007 - Page created

Previous Comments For This Page

Camping Villarcayo
By marcos on 23/11/2014

¿Por qué no desglosa los cálculos que se han efectuado? Gracias
By canario76 on 20/11/2014

5438 sq.ft. minus a few hundred to subtract the roof eaves and you are at about 5,000 for the Main Clubhouse at Parklane
By Jay Levine on 13/11/2014

On 12/11/2014

El programa tiene problemas, intente varias veces cargar nuevos datos pero me volvia a calcular el área de la información anterior, favor chequear esto, saludos. El programa esta muy bueno por lo tanto hay que mejorarlo. Gracias
By [email protected] on 12/11/2014

Hi Martin, you can use the Full Screen option to enlarge the map.
By Free Map Tools on 08/11/2014

This is a great tool pity you can;t enlarge the map area
By Martin A on 08/11/2014

muy util
By jvega on 05/11/2014

Version is not beta, it is functioning and can upload /KML files. Please send us the file you are uploading and we can try to identify what aspect of it causes issues.
By Free Map Tools on 31/10/2014

No functioning!! is version beta, error upload file kml
On 30/10/2014

By Finca Sosa AProx on 29/10/2014

muy bueno el programa
By elias on 28/10/2014

I made a KML file using Planimeter on my KitKat Android. However I cannot load it in order to edit. Does anybody know how to open it on the freemaptools?
By Thomas Calil on 27/10/2014

By WILL on 26/10/2014

Rastrojo de Mz "El Tambito" 75,9 ha
By Martin Ibarra on 25/10/2014

yes very good but better resolution needed
By logana broughton on 24/10/2014

On 24/10/2014

By REZZA on 21/10/2014

This is the approximate land
By Korimerla 28 on 20/10/2014

excelente herramenta
On 18/10/2014

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