What is the Coast FIRE number at age 30?
Under a 7% nominal return, 2.5% inflation, $40,000 of annual expenses, a 4% withdrawal rate and retirement at 65, a 30-year-old's Coast FIRE number is approximately $222,000 — meaningfully lower than at 35 because the extra five years of compounding do more of the work.
Run it with your own numbers
The Coast FIRE Calculator below is loaded with this scenario's assumptions. Change any input and the answer updates instantly.
Coast FIRE number
$222,281
Enough to coast from today.
Your progress
22.5%
Toward the Coast FIRE number.
Assumptions behind this number
- 7% nominal expected return; 2.5% inflation → ~4.4% real growth.
- Monthly compounding; figures in today's purchasing power.
- Retirement age 65; annual expenses $40,000; 4% withdrawal rate → a $1,000,000 FI number in today's dollars.
- No taxes, fees, or contribution changes modelled.
- The starting balance is illustrative and only affects the "are you coasting yet?" progress; the Coast FIRE number depends only on age, retirement age, expenses, withdrawal rate and return. Change any value above.
Why the number comes out this way
The only thing separating the age-30 number from the age-35 number is five more years of runway — and at compound rates those five years are worth a surprising amount. With 35 years to 65 instead of 30, the same real return multiplies a starting dollar roughly 4.5× rather than 3.6×, so you need less upfront to reach the identical target.
That is the whole point of starting early: ~$222,000 at 30 does the same job as ~$276,000 at 35, a gap of about $53,000 bought purely with time. The earlier you set the money aside, the more of the final nest egg is compounding rather than contribution.
Because the target is discounted at the real rate, the $1,000,000 FI figure is expressed in today's dollars — it represents a $40,000 lifestyle preserved against inflation, not a nominal account balance.
Keep exploring
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Frequently asked questions
Why is the Coast FIRE number lower at 30 than at 35?
Because five extra years of compounding to age 65 mean each dollar grows more, so a smaller amount today reaches the same target under these assumptions.
How much does starting five years earlier save?
Under these assumptions the number drops from about $276,000 at 35 to about $222,000 at 30 — roughly $53,000 less, funded by time rather than extra saving.
What retirement age does this assume?
Age 65. A different retirement age changes the years of compounding and therefore the number — set your own in the calculator.
Does a higher withdrawal rate lower the number?
Yes — a higher withdrawal rate lowers the FI target (expenses ÷ rate), which lowers the amount you need to coast. Adjust the rate to compare.
Is this financial advice?
No — it is an educational projection under stated assumptions, not a recommendation to stop or start investing.
Educational use only
Educational purposes only. Calculator results are estimates based on assumptions and user inputs. They are not financial, investment, legal, or tax advice. Investing involves risk, including possible loss of principal. Past performance does not guarantee future results.