Inthispaper,weaddresstheproblemofexactcomputationoftheHausdorffmeasureofaclassofSierpinskicarpetsEtheself-similarsetsgeneratinginaunitregularpentagonontheplane.Undersomeconditions,weshowthenaturalcoveringisthebestone,andtheHausdorffmeasuresofthosesetsareeuqalto|E|s,wheres=dimHE.