$3,000 a month for 15 years at returns from 4% to 10%
| Return | Balance | Of which growth | In today’s dollars |
|---|---|---|---|
| 4% | $733,971 | $193,971 | $471,108 |
| 5% | $794,474 | $254,474 | $509,942 |
| 6% | $860,736 | $320,736 | $552,473 |
| 7% | $933,314 | $393,314 | $599,059 |
| 8% | $1,012,819 | $472,819 | $650,090 |
| 10% | $1,195,332 | $655,332 | $767,238 |
Year by year at 7%
| Year | Put in so far | Balance | In today’s dollars |
|---|---|---|---|
| 1 | $36,000 | $37,141 | $36,059 |
| 2 | $72,000 | $76,882 | $72,468 |
| 3 | $108,000 | $119,404 | $109,272 |
| 4 | $144,000 | $164,903 | $146,515 |
| 5 | $180,000 | $213,588 | $184,243 |
| 6 | $216,000 | $265,680 | $222,502 |
| 7 | $252,000 | $321,418 | $261,342 |
| 8 | $288,000 | $381,058 | $300,811 |
| 9 | $324,000 | $444,873 | $340,958 |
| 10 | $360,000 | $513,155 | $381,836 |
| 11 | $396,000 | $586,217 | $423,496 |
| 12 | $432,000 | $664,393 | $465,992 |
| 13 | $468,000 | $748,041 | $509,380 |
| 14 | $504,000 | $837,545 | $553,716 |
| 15 | $540,000 | $933,314 | $599,059 |
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 $3,000 a month 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) |
|---|---|---|---|
| 8 years | $291,997 | $375,106 | $473,087 |
| 15 years | $619,917 | $891,839 | $1,268,075 |
The middle of the simulation sits below the steady 7% figure of $933,314 because ups and downs cost compounding: a 20% loss needs a 25% gain to get back.
What $933,314 would pay in retirement
At a 4% first-year withdrawal, $933,314 pays about $37,333 a year, $3,111 a month, before tax; in today’s dollars that is about $23,962 a year. How long a balance near it lasts at each withdrawal: how long $900,000 lasts. To stop saving early and let growth do the rest, see Coast FIRE numbers by age.
$36,000 a year is more than the 2026 401(k) limit of $24,500, so part of it would go to a taxable account or a spouse’s plan. See contribution limits, the 401(k) calculator and the Roth IRA calculator.
$3,000 a month for other terms
| Years | Balance | In today’s dollars |
|---|---|---|
| $3,000 a month for 5 years | $213,588 | $184,243 |
| $3,000 a month for 10 years | $513,155 | $381,836 |
| 15 years | $933,314 | $599,059 |
| $3,000 a month for 20 years | $1,522,609 | $843,032 |
| $3,000 a month for 25 years | $2,349,126 | $1,121,955 |
| $3,000 a month for 30 years | $3,508,358 | $1,445,397 |
| $3,000 a month for 35 years | $5,134,241 | $1,824,624 |
| $3,000 a month for 40 years | $7,414,626 | $2,273,004 |
Other amounts for 15 years
$50 a month: $15,555, $100 a month: $31,110, $150 a month: $46,666, $200 a month: $62,221, $250 a month: $77,776, $300 a month: $93,331, $400 a month: $124,442, $500 a month: $155,552, $600 a month: $186,663, $750 a month: $233,329, $1,000 a month: $311,105, $1,500 a month: $466,657, $2,000 a month: $622,210, $2,500 a month: $777,762, $5,000 a month: $1,555,524.
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.