Don't underestimate the amount needed for retirement. Retirement is all about enjoying your last jubilee years on this reality, this existence, this current present. You can live below your means but is it worth it? What the point of retirement if you are unsatisfied and struggle to make ends meet.

The short answer will be, how much you spend now per month is how much you need per month to retire, or maybe slightly more... I hope people understand not to cheap out on retirement. Aim for the better, not the lowest.