Em Light Year AngstromAstronomical UnitAttometerBarleycornCableChainCentimeterCubitDecimeterDigitDekameterEllEmFathomFootFurlongGigameterHandHectometerInchLeagueLight YearLineLinkKilometerMeterMegameterMileMilMicroinchMicrometerMillimeterNautical LeagueParsecPicometerNanometerNautical MilePalmPerchPetameterPicaPointPoleRodRopeScandinavian MileSpanTerameterThouYard AngstromAstronomical UnitAttometerBarleycornCableChainCentimeterCubitDecimeterDigitDekameterEllEmFathomFootFurlongGigameterHandHectometerInchLeagueLight YearLineLinkKilometerMeterMegameterMileMilMicroinchMicrometerMillimeterNautical LeagueParsecPicometerNanometerNautical MilePalmPerchPetameterPicaPointPoleRodRopeScandinavian MileSpanTerameterThouYard How many Light Years in a Em? 1 Em equals to 4.474284530426554e-19 Light Years Reserved Space