Put in your numbers, then push them as hard as you like. The page shows where your savings end up and how extreme things have to get before the money runs out. Everything is in today's dollars, so inflation is already taken out.
Three futures with the same spending and income, plus the spend-it-all path that lands on $0. The dashed line assumes investments never beat inflation again for the rest of your life.
Each box changes one thing and leaves the rest of your numbers alone. It is the smallest push that empties the account by the end of your plan.
The projection assumes you watch the balance fall for decades and never react. In real life you would have every one of these available, and none is counted above.
Landing on exactly $0 leaves no margin for a bad market, so treat the spend-it-all figure as a ceiling that shows the size of the gap, and keep some buffer below it. A down payment and costlier stretches of life go in as rough figures under Big costs. A rough number is fine here: the point is to see how much room there is, and a few thousand dollars either way will not change the answer. For a one-time hit, use the crash slider. Tax is one flat rate on withdrawals, which is a rough stand-in for the real rules. Returns are applied smoothly each year, so use the crash slider to test a bad start. This is a simple calculator for building intuition and is not financial advice. Based on the article Why You'll Probably Never Run Out Of Money.