$600 a month for 35 years at returns from 4% to 10%
| Return | Balance | Of which growth | In today’s dollars |
|---|---|---|---|
| 4% | $539,949 | $287,949 | $191,889 |
| 5% | $665,078 | $413,078 | $236,358 |
| 6% | $824,162 | $572,162 | $292,894 |
| 7% | $1,026,848 | $774,848 | $364,925 |
| 8% | $1,285,541 | $1,033,541 | $456,860 |
| 10% | $2,039,275 | $1,787,275 | $724,724 |
Year by year at 7%
| Year | Put in so far | Balance | In today’s dollars |
|---|---|---|---|
| 1 | $7,200 | $7,428 | $7,212 |
| 2 | $14,400 | $15,376 | $14,494 |
| 3 | $21,600 | $23,881 | $21,854 |
| 5 | $36,000 | $42,718 | $36,849 |
| 10 | $72,000 | $102,631 | $76,367 |
| 15 | $108,000 | $186,663 | $119,812 |
| 20 | $144,000 | $304,522 | $168,606 |
| 25 | $180,000 | $469,825 | $224,391 |
| 30 | $216,000 | $701,672 | $289,079 |
| 35 | $252,000 | $1,026,848 | $364,925 |
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 $600 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) |
|---|---|---|---|
| 18 years | $158,610 | $237,697 | $367,049 |
| 35 years | $505,872 | $929,170 | $1,777,294 |
The middle of the simulation sits below the steady 7% figure of $1,026,848 because ups and downs cost compounding: a 20% loss needs a 25% gain to get back.
What $1,026,848 would pay in retirement
At a 4% first-year withdrawal, $1,026,848 pays about $41,074 a year, $3,423 a month, before tax; in today’s dollars that is about $14,597 a year. How long a balance near it lasts at each withdrawal: how long $1 million lasts. To stop saving early and let growth do the rest, see Coast FIRE numbers by age.
$7,200 a year fits in an IRA, whose 2026 limit is $7,500 under 50. See contribution limits, the 401(k) calculator and the Roth IRA calculator.
$600 a month for other terms
| Years | Balance | In today’s dollars |
|---|---|---|
| $600 a month for 5 years | $42,718 | $36,849 |
| $600 a month for 10 years | $102,631 | $76,367 |
| $600 a month for 15 years | $186,663 | $119,812 |
| $600 a month for 20 years | $304,522 | $168,606 |
| $600 a month for 25 years | $469,825 | $224,391 |
| $600 a month for 30 years | $701,672 | $289,079 |
| 35 years | $1,026,848 | $364,925 |
| $600 a month for 40 years | $1,482,925 | $454,601 |
Other amounts for 35 years
$50 a month: $85,571, $100 a month: $171,141, $150 a month: $256,712, $200 a month: $342,283, $250 a month: $427,853, $300 a month: $513,424, $400 a month: $684,565, $500 a month: $855,707, $750 a month: $1,283,560, $1,000 a month: $1,711,414, $1,500 a month: $2,567,120, $2,000 a month: $3,422,827, $2,500 a month: $4,278,534, $3,000 a month: $5,134,241, $5,000 a month: $8,557,068.
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.