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My problem is when using the "measure Area" tool on the toolbar I get the correct value but when using the field calculator in the Layer Attributes the area is very different including -ve areas. Both the project and layer are using a UTM CRS. Using version 2.0.1

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    Could you add some more context? What software are you using? Maybe a link to a picture to demonstrate what you try to do could help as well. – Martin Oct 31 '13 at 14:38
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Note that identify tool and field calculators use different methods to calculate areas:

https://hub.qgis.org/issues/4252

Vector -> Geometry Tools -> Export/Add geometry columns

lets you choose if measurement of the new columns shall be in layer CRS, project CRS or ellipsodial (which the identify tool uses).

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