What is the Coast FIRE number at age 35?
Under a 7% nominal return, 2.5% inflation, $40,000 of annual expenses, a 4% withdrawal rate and retirement at 65, a 35-year-old's Coast FIRE number is approximately $276,000 — the amount that, invested today and left untouched, would grow to a $1,000,000 nest egg (in today's dollars) by 65 without further contributions.
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
$275,551
Enough to coast from today.
Your progress
18.1%
Toward the Coast FIRE number.
Assumptions behind this number
- 7% nominal expected return; 2.5% inflation → ~4.4% real growth.
- Monthly compounding; growth shown in today's purchasing power (the FI target is a real figure).
- 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 moves the "are you coasting yet?" progress readout — the Coast FIRE number itself depends only on age, retirement age, expenses, withdrawal rate and return. Change any value above.
Why the number comes out this way
Coast FIRE separates saving from growing. The Coast FIRE number is simply the future nest egg discounted back to today at your real return — so the only question that sets it is how many years of compounding remain. At 35 you have 30 years to 65, and at ~4.4% real growth a dollar invested today multiplies roughly 3.6× over that stretch.
That is why ~$276,000 today is enough to "coast": you stop adding money and let 30 years of compounding carry the balance to the FI target on its own. Every year you delay, that multiplier shrinks and the required amount climbs — the number is a snapshot of how much runway time is still giving you.
Note that the number is expressed in today's dollars because the engine grows the balance at the real (inflation-adjusted) rate. The nominal balance at 65 will be larger; it is designed to fund a $40,000 lifestyle with the same buying power it has now.
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Frequently asked questions
How is the Coast FIRE number at 35 calculated?
It is the FI target (annual expenses ÷ withdrawal rate) discounted back to today at the real return, over the years to retirement — so it answers "how much invested now grows to the target by 65 with no more contributions, under these assumptions."
Does my current balance change the Coast FIRE number?
No — under these assumptions the number depends only on age, retirement age, expenses, withdrawal rate and return. Your balance and contributions only determine how close you already are.
What if I assume a lower return than 7%?
A lower real return means compounding does less lifting, so the required amount rises; raise or lower the return in the calculator to see the number move.
Why is the target shown in today's dollars?
Because the engine grows the balance at the inflation-adjusted rate, the figures are stated in today's purchasing power; the nominal balance at 65 would be higher.
Is reaching Coast FIRE a recommendation to stop investing?
No. This is an educational projection under stated assumptions, not advice — many people keep contributing past their Coast FIRE number.
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.