Measuring Tool For Google Maps
Google Maps have introduced another new feature. In essence the new feature allows you to measure the length between two points (or more than one if you want) or measure an area. You can read more about it on the official Google Maps blog, Official Google Maps API Blog: v2.85: Wondering how looong your polylines are or how BIG your polygons are? We have the answers!
Or to just get a feel you can work out how many kilometres I run when I jog around West Ham Park near my home in East London. I make it about two kilometres per circuit - but I'm not telling you how many circuits I manage.