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Area is calculating wrong using $area in field calculator (QGIS 2.8.1-Wien) - Geographic Information Systems Stack Exchange
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coordinate system - How to Get QGIS to calculate Area in Layer's Units? - Geographic Information Systems Stack Exchange
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Calculate Geometry in QGIS: How to calculate line length, polygon area, and polygon perimeter – OpenSourceOptions
![Ujaval Gandhi on Twitter: "How to estimate the road width from a layer of road polygons using #QGIS? Testing with some dummy data, the simple expression 2*$area/$perimeter seems to give decent results. Ujaval Gandhi on Twitter: "How to estimate the road width from a layer of road polygons using #QGIS? Testing with some dummy data, the simple expression 2*$area/$perimeter seems to give decent results.](https://pbs.twimg.com/media/FUqojPxagAEra6K.jpg:large)