Find the retirement savings you need to support a target monthly income, using a safe withdrawal rate.
This is the classic '4% rule': divide your desired annual income by your chosen safe withdrawal rate to find the corpus needed.
Corpus: Annual income ÷ withdrawal rate
Is the 4% rule reliable?
It is a widely used rule of thumb, based on old US market data — it is not a guarantee. The real safe rate for you depends on your own returns, inflation, and how long your money needs to last.