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?
Show Crosshairs?
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.

To draw a new area click the [Start a New Area] button or press Alt+n


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
  • Export to KML option

Version History

  • 17th June 2015 - Markers now show their lat/lng when you hover over them
  • 18th December 2014 - Total area is now calculated
  • 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

Area measurement can be done with clarified imagery on a shaded part of the map
By Vikas on 20th August 2016

Muy bueno y fácil de usar, felicitaciones.
By Martin on 19th August 2016

Thanks Billy
By Free Map Tools on 19th August 2016

Great app
By Billy Chris on 19th August 2016

Hi, the distance of the perimeter of the area is twice the distance between the two pints if the area only has two points. If you are measuring distances, please use the Measure Distance on a Map tool.
By Free Map Tools on 10th August 2016

en distancias mide el doble de lo que es realmente, y si no probar con medir el largo de un campo de fútbol. marca 200 metros cuando todos sabemos que no deberia pasar de 100. tenerlo en cuenta para vuestras mediciones. un saludo
On 6th August 2016

Gracias, me ha sido de mucha utilidad, y he aprendido algo nuevo , que me permite se mas seguro en mis apreciaciones, que puedo comprobar con esta herramienta Y gracias por la generosidad de compartir, a los creadores del programa, como tambien a quien lo recomienda y enseña a través de tutoriales
By Hector Moraga on 4th August 2016

Ana, it is commas separating decimals
By Free Map Tools on 4th August 2016

Una pregunta en los vbalores que calcula los puntos son puntos o figuran como comas que separan decimales?
By ANA on 4th August 2016

Hi Agustin, if you switch to Full Screen then print from the web browser, this should work.
By Free Map Tools on 4th August 2016

By AGUSTIN ROJAS CASTILLO on 3rd August 2016

Excellent! Like it, this helps me a lot!
On 2nd August 2016

Thanks very much
On 2nd August 2016

Esta aplicación me ayuda mucho para determinar de manera paralela mis levantamientos topográficos con otras aplicaciones. Excelente para pre-visualizar levantamientos topográficos.
By Mílton Davila on 29th July 2016

muy bueno el programa nos re sirvio
On 27th July 2016

Excelente Opcion, GRACIAS
By Pablo M. Zapata Rios on 24th July 2016

donde puedo descargar
By jordan on 23rd July 2016

On 20th July 2016

Excellent tool. So glad I found this website. Very accurate as well.
By Patrick on 19th July 2016

On 19th July 2016

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