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system
how to calculate lump sum required to generate desired monthly income?
user
the product you seek is called a fixed immediate annuity.  you also want to be clear it's inflation adjusted. in the us, the standard fixed annuity for a 40year old male (this is the lowest age i find on the site i use) has a 4.6% return. $6000/ yr means one would pay about $130,000 for this. the cost to include the inflation adder is about 50%, from what i recall. so close to $200,000.  this is an insurance product, by the way, and you need to contact a local provider to get a better quote.
assistant