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Savings Rate to Retirement Calculator

Enter your savings rate and return assumptions to see years to retirement.

How it is calculated

Income is normalised to 1 per year. With savings rate s, spending is 1 − s, and the nest egg needed is target = (1 − s) ÷ w, where w is the withdrawal rate. The tool then simulates year by year: balance = balance × (1 + r) + s, starting from zero, and counts the years until the balance reaches the target. Here r is the real (after-inflation) return, and each year's saving is added at the end of the year. The savings rate must be above 0 and below 100, the withdrawal rate above 0. If the target is not reached within 200 years, no result is shown. It assumes constant income, constant spending and no existing savings.

Worked example

Save 40% of income, earn a 5% real return and use a 4% withdrawal rate. Spending is 1 − 0.40 = 0.60 of income, so the target is 0.60 ÷ 0.04 = 15.00× income. Each year adds 0.40 and the pot grows 5%: after 21 years it is about 14.29 times income, after 22 years about 15.40, which passes 15. The answer is 22 years.

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Common mistakes

  • Entering a nominal return such as 8% without subtracting inflation. The simulation treats the return as real, so an unadjusted figure makes the date look too early.
  • Entering the savings rate as a share of gross pay when you actually measure spending against take-home pay (or the reverse). The target depends on the spending share, so be consistent.
  • Treating the output as a promise. Constant returns are assumed, while real markets are uneven in sequence, and the withdrawal rate is a rule of thumb, not a guarantee.
  • Expecting a result for a low savings rate. At a 0% real return, saving 10% with a 4% withdrawal would take over 200 years, so the tool shows nothing.
  • Forgetting that starting savings are not counted. The simulation begins at zero, so existing investments would shorten the real timeline.

Sources

About this calculator

This calculator applies the math behind the FIRE (Financial Independence, Retire Early) movement: your savings rate — the share of take-home income you save rather than spend — determines how many years of expenses you accumulate each working year, while your expected real (inflation-adjusted) investment return compounds that stockpile over time. It combines these with a safe withdrawal rate, most commonly the 4% rule associated with Bengen (1994) and the Trinity Study (1998), which sets the target portfolio at about 25 times annual expenses: in historical US market data, an initial withdrawal of 4% of the portfolio, raised each year with inflation, lasted 30 years in all or nearly all of the periods tested. It is a 30-year rule of thumb, not a guarantee that withdrawals can continue indefinitely or that the principal stays intact.

Enter your savings rate and return assumptions and the calculator projects the number of years until your invested savings reach that target multiple of your spending — the point conventionally defined as financial independence. Individuals planning early retirement, financial independence bloggers, and anyone comparing how a higher savings rate versus a higher return shortens their working years use it to see, quantitatively, why the savings rate — not the investment return — is usually the dominant lever in reaching retirement sooner.

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Comments (1)

  • Editorial team

    Enter a return that is already net of inflation: if you expect 7 percent nominal growth and 3 percent inflation, type about 4. The model starts from zero and keeps your lifestyle spending equal to today's, so existing savings or a pension would shorten the answer. For a feel for the lever, saving 50 percent at a 5 percent real return and a 4 percent withdrawal rate gives 17 years. What savings rate are you testing?

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