The “4% rule” says you can spend about 4% of your portfolio in the first year and adjust for inflation with a low risk of running out over 30 years. Target = yearly spending ÷ withdrawal rate. Public pensions reduce what you need to save.
FAQ
How much do I need to retire?
With the default numbers above – Target nest egg: £800,000.
Standard financial formulas (monthly compounding). Change any input to match your situation.