Calculation of length in QGIS

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members,

I am trying to calculate the length of lines, which were convatede before from gps to Shapefile (vectorlayer). I tryed it with "feldrechner" (matrix calculator?) and the most time I got 0, or in the other times I got a very unrealistic result.

I also tryed it with measurement of lines. There I got a good result. But I think, because of tracing the line by hand it is not so exact.

My question: Do anybody know how I can get my exact length or also area?

my both results:e.g. this result (first way): 2.74556577576214e-07In my other way I got in this case 35,555m.There is anything wrong...

I would be really happy finding a solution(=



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