Gross (brutto) is the agreed hourly rate. Net (netto) is what hits NemKonto after AM-bidrag, A-skat, ATP, and pension.
A typical 150 kr/hour can land around 90–110 kr after tax, depending on your tax card.
Use your trækprocent and månedsfradrag from skat.dk/tastselv — then check the KraftJob salary checker before you accept.