Using Google Earth.

1. Go to www.earth.google.com
2. On the top left, click on the magnifying glass, Search
3. Type in the address of the location
4. Select the location that populates in the results
5. It will show the property, then in the bottom right, click on the + sign
6. Zoom in until you see the property
7. On the left, click on the ruler icon, Measure distance & area
8. Select a starting point with your mouse, then the remaining points
9. Once the area is mapped, you will see the Perimeter and Area calculated