Am I Coast FIRE? A One-Minute Check
Coast FIRE is a savings checkpoint, not a quit-your-job date. You have saved enough that compound growth alone is projected to reach your full FIRE number by a target age — with $0 further contributions. You still need income for today’s bills. You do not need to keep stuffing retirement accounts for the math to work on paper.
That is the whole idea. For how Coast compares to Barista FIRE (work style after a milestone, not the same question), read the deep compare instead of restating it here:
This post is the short practical check: four inputs, one calculator (or a zero-contribution projection), and a yes/no that matches your numbers — not a forum slogan. Hypothetical examples only. Not advice. A free projection is not a substitute for a paid planner who knows your taxes, benefits, and risk tolerance.
Common Mistakes to Avoid
Mistake 1: Treating your Coast number like a FIRE number
Your Coast FIRE number is smaller than your full FIRE number on purpose. Time still has to do the compounding. If you stop working entirely at the Coast number, you are not “retired early” — you are underfunded for today. Coast means stop needing to save, not stop needing a paycheck.
Mistake 2: Skipping the full FIRE number
You cannot coast to a target you never wrote down. Coast math discounts a full FIRE stash back to today. If annual expenses or the withdrawal rate are wrong, the Coast number is wrong too. Size the destination first: expenses ÷ SWR. See What is my FIRE number? and the FIRE calculator.
Mistake 3: Using a return you would not defend out loud
A higher assumed return shrinks the Coast number and makes “I’m there” easier. Markets do not owe you a smooth 8–10% forever. Pick a real (or nominal) return you can explain — many people test something in the 5–7% real range as a draft — then re-run at a more conservative rate. The one-minute check is only as honest as that input.
Mistake 4: Counting planned future contributions as “already Coast”
If the projection only hits the goal because you keep contributing, you are on a path toward Coast or full FIRE — you are not at Coast yet. The test is explicit: contributions = $0 from here, and the portfolio still reaches the full FIRE number by the target year.
Mistake 5: Mixing Coast with Lean / Fat labels
Lean and Fat describe spending levels. Coast describes a work/savings milestone (keep covering expenses; stop mandatory saving). Do not rename a Coast sample “Lean FIRE” because the Coast stash looks small. Small vs full FIRE is compounding time, not a lifestyle badge. Spend-axis labels: Lean FIRE vs Fat FIRE.
How to Run the One-Minute Check
Four steps. No tax, Social Security, or Medicare deep dive on this page — keep those for a fuller plan later.
1. Get your full FIRE number (expenses ÷ SWR)
Write annual spending you actually expect in retirement dollars. Divide by a starting safe withdrawal rate (SWR).
- At 4%, FIRE number ≈ 25× expenses.
- At 3.5%, about 28.6×.
- At 3%, about 33×.
Example identity only: $40,000 ÷ 0.04 = $1,000,000.
Confirm on the FIRE calculator. More on the identity (and when early retirees often want more than 25×): What is my FIRE number?.
2. Count the years until your target age
Target age minus current age. If you want the full FIRE stash at 55 and you are 40, that is 15 years of compounding with no new contributions in the Coast test. Shorter runway → higher Coast number. Longer runway → lower Coast number. Do not invent years you do not believe.
3. Pick an expected return you can defend
This is the growth rate the Coast formula (and the projection) will use while contributions sit at zero. Be consistent with whether you mean real or nominal returns relative to how you defined the FIRE number. If you would not defend the rate in a calm conversation, lower it and re-check. A prettier “yes” from an aggressive rate is not a better plan.
4. Open the Coast FIRE calculator — or zero out contributions on a projection
Primary path (fastest): open the Coast FIRE calculator. Enter annual spending, SWR, expected return, years to the target, and your current portfolio. Read the Coast FIRE number. If current portfolio ≥ Coast number, the identity math says you are at Coast FIRE under those assumptions. If not, the gap is what compounding (or more saving) still has to cover.
The widget is identity math — FIRE number discounted by return over years — a first-draft target. It is not Monte Carlo, not a historical success rate, and not advice.
Projection path (same question, more moving parts): open the main app blank, or load a sample, set your full FIRE / net-worth goal and target year, then set ongoing contributions to zero. If the timeline still crosses the goal by that year, you pass the Coast test under those return assumptions. If it misses, you are not Coast yet — keep covering expenses from work, and either save more, spend less later, extend the year, or accept a different return assumption after you re-run.
Optional: Teacher Coast FIRE sample
Want a live demo instead of a blank form? Open the product sample Teacher Coast FIRE — teacher at 28 aiming to coast by 55, with a Coast $250k goal around age 40 (surplus to a 403(b) in the demo). It is not “Teacher Lean FIRE.”
Hypothetical sample facts (editable in the app; not your plan):
| Piece | Sample value |
|---|---|
| Ages | 28 start → coast by 55; projection 40 years |
| Coast FIRE Number goal | $250,000 in year+12 (~age 40) |
| Starting 403(b) | $5,000 @7% |
| Starting Emergency Fund | $5,000 @4% |
| Monthly salary | $4,500 |
| Monthly expenses | Rent & Bills $2,000 + Groceries/Transport/Healthcare $1,100 + Discretionary $500 = $3,600 |
| Monthly 403(b) contribution | $900 |
Use it to see how a Coast-shaped goal looks on a timeline. For the strict “am I Coast?” test on your numbers, replace the sample with your assets and expenses, then set future contributions to $0 and read whether you still hit the goal by the target year. Sample returns are assumptions, not forecasts.
Check yours now
- Coast FIRE calculator — spend, SWR, return, years, current stash → Coast number vs today.
- Optional: Teacher Coast FIRE — then edit or zero contributions for the projection check.
Run the one-minute Coast check
Primary: Coast FIRE calculator — annual spending, SWR, expected return, years to target, current portfolio. Free, no signup.
Optional: Teacher Coast FIRE — then edit or set contributions to zero for the projection test.
Open Coast FIRE CalculatorFrequently Asked Questions
You have saved enough that, with no additional contributions, compound growth alone is projected to reach your full FIRE number by a chosen target age — while you still earn enough to cover current living expenses.
Full FIRE means the portfolio can support your spending now at a chosen withdrawal rate (expenses ÷ SWR). Coast FIRE means the portfolio is on track to become that full number later without more saving. Same destination; Coast is an earlier checkpoint on the savings axis. Work-style cousin: Coast vs Barista.
Coast number ≈ FIRE number ÷ (1 + expected return)^years. Same idea as present value: discount the future stash back to today at the return you assume. The Coast FIRE calculator does that from spending, SWR, return, and years.
Either works. The landing calculator is the one-minute identity check. The full projector is better when you have multiple accounts, changing expenses, or you want to toggle contributions off and read a year-by-year chart. Start with the Coast FIRE calculator; open the app when you want the timeline.
You are not Coast yet under those assumptions. Options the math allows: save a bit more until you cross the line, lower planned retirement spending (smaller FIRE number → smaller Coast number), extend the target age, or use a return you still defend. Re-run; do not round a miss into a yes.
No. It is a hypothetical demo named Teacher Coast FIRE — start age 28, coast by 55, Coast goal $250,000 in year+12 (~age 40), 403(b) $5,000 @7% + Emergency Fund $5,000 @4%, $4,500/mo salary, $3,600/mo expenses, $900/mo 403(b) contribution. Edit every field. Do not treat sample returns as a prediction. Do not relabel it Lean FIRE.
No. My Projection Calculator is a free projection aid for scenarios you type in. It does not know your tax situation, pension rules, or insurance. Hypothetical outputs are not personalized advice. Use the tool to frame questions; use a qualified professional when decisions are real.
The Bottom Line
Am I Coast FIRE? Four honest inputs, one clear test:
- Full FIRE number = expenses ÷ SWR (FIRE calculator / what is my FIRE number?).
- Years until the age when you want that full number.
- Expected return you are willing to defend (re-test lower if unsure).
- Coast check — Coast FIRE calculator, or a projection with contributions set to zero. If you still hit the goal by the target year, you pass under those assumptions.
Coast is peace of mind on the savings line, not permission to stop earning. For Coast vs Barista as lifestyle paths, use the comparison article. For a live Coast-shaped demo, open Teacher Coast FIRE — then make the numbers yours.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. The projections and examples discussed are hypothetical and based on general assumptions. Investment returns are not guaranteed, and past performance does not predict future results. My Projection Calculator is a planning aid, not a full replacement for a qualified financial advisor. Consult a professional for guidance based on your specific situation.