Area Calculator

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

[11th July 2018] Unfortunately, due to a large price increase in back-end services, we can no longer offer some features on this page.

Measure an Area

Click Here To Load The Map

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

Read KML

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

Comments For This Page

Brilliant for working out field sizes!
By John on 17th September 2019

Love the tool. Use it whenever I%u2019m in doubt about some area. Thank you
By Shahan on 4th September 2019

On 27th August 2019

As a Mathematician, your site is precisely accurate within a mean of 5%. These are, and can be used as Financial & Business Demographical outputs, transcending the necessary needs for the tax paying public. I wholeheartedly thank you & your R & D Staff for facilitating my work. Rick Parent Montreal, Quebec, Canada
By Rick Parent on 12th August 2019

thank you so much!
By Ralu on 11th August 2019

very helpful site, many thanks!
By rich on 5th August 2019

There needs to be a print function so you can have a record of your measurements.
On 9th July 2019

SR No 52/2
By Suresh BN on 24th June 2019

Acres and Square Feet are output
By Free Map Tools on 4th June 2019

Hi KEITH, Can you give some detail why?
By Free Map Tools on 2nd June 2019

This was a fine program but no more. This Map Tool has been bastardized and rendered completely useless.
By KEITH RAWLS on 2nd June 2019

can it be possible to measure in acres, square feet ?
On 31st May 2019

Which browser are you using?
By Free Map Tools on 20th May 2019

Siempre me funciona, pero hoy pongo los puntos y no me encierra el área...
On 20th May 2019

Thanks for your soporte
By Luis PĂ ramo on 17th May 2019

Thanks for the comments LORI
By Free Map Tools on 11th May 2019

Wow! Fantastic and useful tool. I wanted to measure specific areas of my land so I could figure how much hemp and sainfoin seed to buy. This tool worked like a charm. I was able to highlight each area and take a screen shot along with the measured data. Very practical and easy to use. Thanks so much!
By LORI on 11th May 2019

Fantastic tool works well easy to use
By Scott on 6th May 2019

Thanks I use this tool to check areas when doing quotes as often the areas go beyond boundaries and otherwise I cant get an accurate area size.
By Kathryn _ Australia on 12th April 2019

Fantastic tool thank you
By Belvedere on 6th April 2019

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