Better question
Good compared with what?
A salary can be good for one person and tight for another. Region, rent, household size, commuting, student loan plan, pension contributions and debt payments all affect the answer.
That is why a good-salary page should not stop at a single national judgement. It should help the user translate salary into monthly reality.
Decision framework
Judge salary using four layers
Start with gross salary, then convert it into take-home pay. After that, compare it with location costs and personal commitments. Finally, check whether the remaining monthly amount creates comfort or pressure.
Job offers
A higher salary is not always a better deal
A pay rise can be weakened by higher commute costs, pension changes, student loan deductions, childcare costs or moving to a more expensive city. Compare the monthly net difference before deciding.