$20,000 for 30 years at returns from 4% to 10%
| Return | Balance | Multiple | In today’s dollars |
|---|---|---|---|
| 4% | $64,868 | 3.2× | $26,725 |
| 5% | $86,439 | 4.3× | $35,612 |
| 6% | $114,870 | 5.7× | $47,325 |
| 7% | $152,245 | 7.6× | $62,723 |
| 8% | $201,253 | 10.1× | $82,914 |
| 10% | $348,988 | 17.4× | $143,778 |
Year by year at 7%
| Year | Put in so far | Balance | In today’s dollars |
|---|---|---|---|
| 1 | $20,000 | $21,400 | $20,777 |
| 2 | $20,000 | $22,898 | $21,584 |
| 3 | $20,000 | $24,501 | $22,422 |
| 5 | $20,000 | $28,051 | $24,197 |
| 10 | $20,000 | $39,343 | $29,275 |
| 15 | $20,000 | $55,181 | $35,418 |
| 20 | $20,000 | $77,394 | $42,851 |
| 25 | $20,000 | $108,549 | $51,843 |
| 30 | $20,000 | $152,245 | $62,723 |
The range in 1,000 simulated markets
A 7% average does not arrive as 7% every year. In 1,000 simulated sequences of returns averaging 7% with 12% volatility, this is where $20,000 ended up: 1 in 10 markets finished below the first figure, half below the middle one, and 1 in 10 above the last.
| After | Weak (1 in 10 lower) | Middle | Strong (1 in 10 higher) |
|---|---|---|---|
| 15 years | $27,714 | $50,751 | $86,485 |
| 30 years | $55,684 | $125,976 | $280,823 |
The middle of the simulation sits below the steady 7% figure of $152,245 because ups and downs cost compounding: a 20% loss needs a 25% gain to get back.
What $152,245 would pay in retirement
At a 4% first-year withdrawal, $152,245 pays about $6,090 a year, $507 a month, before tax; in today’s dollars that is about $2,509 a year. How long a balance near it lasts at each withdrawal: how long $150,000 lasts. To stop saving early and let growth do the rest, see Coast FIRE numbers by age.
$20,000 for other terms
| Years | Balance | In today’s dollars |
|---|---|---|
| $20,000 for 5 years | $28,051 | $24,197 |
| $20,000 for 10 years | $39,343 | $29,275 |
| $20,000 for 15 years | $55,181 | $35,418 |
| $20,000 for 20 years | $77,394 | $42,851 |
| $20,000 for 25 years | $108,549 | $51,843 |
| 30 years | $152,245 | $62,723 |
| $20,000 for 40 years | $299,489 | $91,810 |
| $20,000 for 50 years | $589,141 | $134,387 |
Other amounts for 30 years
$1,000: $7,612, $5,000: $38,061, $10,000: $76,123, $25,000: $190,306, $50,000: $380,613, $100,000: $761,226, $200,000: $1,522,451, $250,000: $1,903,064, $500,000: $3,806,128, $1,000,000: $7,612,255, $2,000,000: $15,224,510.
How it is worked out
Monthly amounts are deposited at the end of each month and compounded monthly at the rate that equals the annual return; lump sums compound once a year. The headline return is 7% a year, the Trinity-style average the site’s retirement pages use; stock-heavy portfolios have averaged more over long periods and bond-heavy ones less, which is why every page shows 4% to 10%. Today’s dollars divide by 3% inflation a year. The range comes from 1,000 simulated sequences of yearly returns averaging 7% with 12% volatility, with each year’s deposits added through the year. Fees and taxes are not taken out. More on the methodology page.