How the retirement projection works
This calculator builds your nest egg in two stages. First it grows your current savings and your monthly contributions at the expected return until your chosen retirement age, using monthly compounding — the same engine behind the compound interest tool. Then it applies a withdrawal rate to the final balance to estimate the income that pot could provide each year in retirement. The default 4% withdrawal rate comes from research suggesting a portfolio can sustainably support roughly that much per year, adjusted for inflation, over a long retirement without running dry — though it is a guideline, not a guarantee.
The power of starting early
Retirement saving is the clearest example of compounding rewarding time. A 25-year-old contributing modestly each month can finish with a larger nest egg than a 40-year-old contributing far more, simply because the early money has decades to grow. The 'investment growth' line shows how much of your nest egg came from returns rather than your own contributions; over a full career it usually dwarfs what you put in. The lesson is blunt — the most valuable contribution you can make is the one you make earliest, even if it is small.
Contributions, employer matches and limits
Regular contributions are the engine you control. Many workplace pensions and retirement accounts add an employer match, which is effectively free money — always contribute at least enough to capture the full match. Tax-advantaged accounts also let your investments grow without annual tax drag, accelerating compounding. If your projected nest egg or income falls short of your needs, the levers are clear: contribute more, work a little longer, or seek a higher (and riskier) expected return. Test each by changing the inputs here.
Inflation, the 4% rule and reality
This projection is in nominal terms, so remember that inflation will erode the purchasing power of a future dollar — an income that looks generous in thirty years may buy less than it appears. The 4% withdrawal rate is a widely cited starting point, but the right figure depends on your retirement length, investment mix and flexibility. Real returns also vary year to year rather than arriving smoothly. Use this as a planning baseline and revisit it regularly, ideally with a qualified financial adviser. These calculators use standard financial formulas and the figures you enter. Real interest rates, lender fees and tax treatment vary by bank and country, so treat the results as planning estimates and confirm exact numbers with your lender or a qualified adviser before committing.
Frequently asked questions
How much will I have saved for retirement?
This calculator grows your current savings and monthly contributions at your expected return until retirement age, with monthly compounding, to estimate your nest egg — then applies a withdrawal rate to estimate annual income.
What is the 4% rule?
It is a guideline suggesting you can withdraw about 4% of your retirement portfolio in the first year, then adjust for inflation, with a good chance the money lasts roughly 30 years. It is a starting point, not a guarantee.
How much should I contribute each month?
Enough to be on track for the income you want — and at least enough to capture any employer match. If the projected nest egg falls short, increase contributions, extend your timeline, or revisit your investment mix.
Does this account for inflation?
No — the figures are nominal. Inflation will reduce the real purchasing power of your future nest egg, so treat the income estimate as today's-dollars optimistic and plan with a margin.