Netherlands: two pillars before your own savings
The AOW state pension and an occupational pension provide most Dutch retirement income and are not modelled here. The Netherlands is unusual in this list because the second pillar does so much of the work: most Dutch employees are enrolled in an industry or company pension fund through their collective agreement, so a large, effectively compulsory retirement saving is already happening before anyone opens a calculator like this one.
That makes the number on this page a third pillar, not the whole answer. Treat it as what you are adding on top of the AOW and your fund, and set the income target to the gap the two of them leave rather than to the whole income you want. Your annual pension statement, and mijnpensioenoverzicht.nl, give you the two figures to subtract.
The AOW age is 67 and is linked to life expectancy, so it is not fixed for anyone still decades out, it is reviewed on a published rule and moves with the projections. If you are 30 today, the age this page opens on is the current rule, not a promise about the 2060s. It is worth running the projection twice, once at 67 and once a year or two later, to see how much of the result rests on that assumption.
Dutch assumptions: a 6.5% nominal return and 2% inflation, a real return of 4.41% a year.