$3,000 a month for 40 years at returns from 4% to 10%
| Return | Balance | Of which growth | In today’s dollars |
|---|---|---|---|
| 4% | $3,483,191 | $2,043,191 | $1,067,796 |
| 5% | $4,447,574 | $3,007,574 | $1,363,434 |
| 6% | $5,723,033 | $4,283,033 | $1,754,435 |
| 7% | $7,414,626 | $5,974,626 | $2,273,004 |
| 8% | $9,663,238 | $8,223,238 | $2,962,332 |
| 10% | $16,651,044 | $15,211,044 | $5,104,492 |
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 |
| 5 | $180,000 | $213,588 | $184,243 |
| 10 | $360,000 | $513,155 | $381,836 |
| 15 | $540,000 | $933,314 | $599,059 |
| 20 | $720,000 | $1,522,609 | $843,032 |
| 25 | $900,000 | $2,349,126 | $1,121,955 |
| 30 | $1,080,000 | $3,508,358 | $1,445,397 |
| 35 | $1,260,000 | $5,134,241 | $1,824,624 |
| 40 | $1,440,000 | $7,414,626 | $2,273,004 |
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) |
|---|---|---|---|
| 20 years | $919,093 | $1,422,116 | $2,258,308 |
| 40 years | $3,266,744 | $6,489,422 | $12,929,820 |
The middle of the simulation sits below the steady 7% figure of $7,414,626 because ups and downs cost compounding: a 20% loss needs a 25% gain to get back.
What $7,414,626 would pay in retirement
At a 4% first-year withdrawal, $7,414,626 pays about $296,585 a year, $24,715 a month, before tax; in today’s dollars that is about $90,920 a year. How long a balance near it lasts at each withdrawal: how long $5 million 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 |
| $3,000 a month for 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 |
| 40 years | $7,414,626 | $2,273,004 |
Other amounts for 40 years
$50 a month: $123,577, $100 a month: $247,154, $150 a month: $370,731, $200 a month: $494,308, $250 a month: $617,886, $300 a month: $741,463, $400 a month: $988,617, $500 a month: $1,235,771, $600 a month: $1,482,925, $750 a month: $1,853,657, $1,000 a month: $2,471,542, $1,500 a month: $3,707,313, $2,000 a month: $4,943,084, $2,500 a month: $6,178,855, $5,000 a month: $12,357,710.
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.