Okay this is really neat! This website (http://acme.com/planimeter/) allows you to plot points on a map – using Google Maps – and it gives you area measurements back. You can use it in “map” view so you can follow the streets, “satellite” so you can see the house you are looking at or “hybrid” and combine both.
Plot your points and the measurements appear underneath the map as you move the points. Here is RE/MAX Professional Associates office in Spencer: