Financial Independence Retire Early (FIRE) Calculator with Inflation Adjustment
FIRE arithmetic is deceptively simple: your target corpus is annual spending divided by your safe withdrawal rate, so a 4% rate means 25 times expenses. What actually determines the date is your savings rate — the share of take-home pay you invest — because it simultaneously raises contributions and lowers the number you need.
At a 4% withdrawal rate you can safely draw $45,000 a year from $1,125,000.
| Year | Projected portfolio | FIRE target | Progress |
|---|---|---|---|
| Age 33 | $155,939 | $1,125,000 | 14% |
| Age 34 | $194,475 | $1,125,000 | 17% |
| Age 35 | $235,797 | $1,125,000 | 21% |
| Age 36 | $280,107 | $1,125,000 | 25% |
| Age 37 | $327,619 | $1,125,000 | 29% |
| Age 38 | $378,567 | $1,125,000 | 34% |
| Age 39 | $433,197 | $1,125,000 | 39% |
| Age 40 | $491,777 | $1,125,000 | 44% |
| Age 41 | $554,591 | $1,125,000 | 49% |
| Age 42 | $621,946 | $1,125,000 | 55% |
The 4% rule and where it came from
The Trinity Study tested historical US portfolios of stocks and bonds over rolling 30-year windows and found that withdrawing 4% of the initial balance, inflation-adjusted, survived almost every period. Longer retirements of 40-50 years, which early retirees face, are usually modelled at 3.25-3.5% instead.
Coast FIRE explained
Coast FIRE is the balance at which compound growth alone reaches your target by traditional retirement age. Once you hit it you can stop contributing entirely and simply cover living costs with any job. The card above discounts your FIRE number back to today at your expected return over the years remaining until 65.
Sequence of returns risk
Two retirees with identical average returns can end up in completely different places if one meets a bear market in the first three years. Mitigations include a two-year cash buffer, a rising equity glidepath, and flexible spending rules that trim withdrawals by 10% after a down year.
The four types of FIRE
| Type | Expense multiplier | Typical corpus (on $45k spend) | Withdrawal margin | Best suited to |
|---|---|---|---|---|
| Lean FIRE | 0.75× | $843,750 | Tight — needs flexibility | Low cost-of-living, minimalists |
| Barista FIRE | 0.6× + part-time income | $675,000 | Wide — wages cover gaps | Those wanting health cover |
| Coast FIRE | Front-loaded | Varies by age | N/A until traditional age | Young high earners |
| Standard FIRE | 1.0× | $1,125,000 | Trinity-tested 4% | Most FIRE followers |
| Fat FIRE | 1.25-1.5× | $1.4m-$1.7m | Very wide | High earners, families |
People also ask
What is the 4% safe withdrawal rate rule?
Derived from the Trinity Study, it states that withdrawing 4% of your initial portfolio annually, adjusted for inflation, had a very low probability of depletion over a 30-year retirement. Early retirees often use 3.25-3.5% for longer horizons.
How does Coast FIRE differ from traditional FIRE?
Coast FIRE means you have already invested enough that compound growth alone will reach your retirement target by traditional retirement age, even if you never contribute another dollar.
Does the FIRE number account for inflation?
Yes, when you enter a real (post-inflation) return such as 7% rather than a nominal 10%. All balances then represent today's purchasing power.
Three worked examples
Same engine, three different starting points — useful if you want to see how sensitive the answer is before you type your own numbers in.
Example 1: current age 24.96 years, currency "USD $"
On the lower / more conservative end. At a 4% withdrawal rate you can safely draw $45,000 a year from $1,125,000.
Example 2: current age 32 years, currency "USD $"
A typical middle-of-the-road setup. At a 4% withdrawal rate you can safely draw $45,000 a year from $1,125,000.
Example 3: current age 41.6 years, currency "GBP £"
On the higher / more demanding end. At a 4% withdrawal rate you can safely draw £45,000 a year from £1,125,000.
Quick answers about the FIRE (Retire Early) Calculator
What exactly does the FIRE (Retire Early) Calculator work out?
FIRE arithmetic is deceptively simple: your target corpus is annual spending divided by your safe withdrawal rate, so a 4% rate means 25 times expenses. You enter currency, current age, annual expenses and current invested net worth (plus 4 more optional details) and the result panel updates straight away, so you can compare two or three versions of the same question in a few seconds.
What do I need before I start?
Only 8 fields: currency, current age, annual expenses, current invested net worth, monthly savings, expected real return, safe withdrawal rate and fIRE type. Nothing else is needed and nothing is stored.
How is it calculated — the 4% rule and where it came from?
The Trinity Study tested historical US portfolios of stocks and bonds over rolling 30-year windows and found that withdrawing 4% of the initial balance, inflation-adjusted, survived almost every period. The same maths runs inside this page, so hand-checking the result on paper gives you the identical figure.
Why do two calculators give me different answers for fIRE (Retire Early)?
Coast FIRE is the balance at which compound growth alone reaches your target by traditional retirement age. Different sites pick different assumptions, so always check which method a calculator states before you trust the gap between two numbers.
What does the "The four types of FIRE" table on this page tell me?
It is the reference range this tool works against — 5 rows from "Lean FIRE" (0.75×) up to "Fat FIRE" (1.25-1.5×). Use it to sanity-check whether the number you just calculated sits where you expected it to.
Which currency should I pick?
The dropdown offers 5 choices — USD $, GBP £, EUR €, CAD C$ and AUD A$. Pick the one that matches your real situation rather than the one you would like to be true; currency usually moves the final figure more than any other single input, so it is worth running it twice with the option above and below your guess.
Does it work in both metric and imperial (or another currency)?
Yes. The "Currency" control converts every field and every result, so you never have to convert anything by hand before typing it in. Switch it after entering your numbers and the output re-renders instantly in the new system.
Do I have to press a button or reload the page to see the result?
No. FIRE (Retire Early) Calculator runs completely inside your browser, so the moment you change a value the cards recalculate — there is no submit step, no page reload and no waiting for a server round trip. That also means it keeps working on a weak or intermittent mobile connection.
Is it free, and do you keep what I type?
It is free with no sign-up, no app install and no usage limit. Nothing you enter into FIRE (Retire Early) Calculator leaves your device — the calculation is JavaScript running locally, so there is no upload of your figures to DrHint or anyone else.
Can I use it on a phone?
Yes — the layout stacks to a single column on small screens and the number fields open the numeric keypad on both Android and iOS. Many people bookmark this page or add it to their home screen and re-open it whenever the question comes up.
Anything to be careful about with the result?
Derived from the Trinity Study, it states that withdrawing 4% of your initial portfolio annually, adjusted for inflation, had a very low probability of depletion over a 30-year retirement. Treat the output as a well-grounded estimate for planning, not as a professional, legal or medical decision on its own.
Next useful tool
See principal, contributions and compound interest split year by year. Supports monthly deposits, any compounding frequency and a full growth table.
See how much interest an extra monthly mortgage payment saves and how many years it removes from the term, with a side-by-side amortisation comparison.
See what money from any past year is worth today, how much purchasing power was lost, and the cumulative and annualised inflation rate between two years.
Compare the snowball and avalanche debt payoff methods across up to four balances. See months to debt-free, total interest paid and which method wins for you.
Convert an hourly wage into weekly, bi-weekly, monthly and annual pay including overtime multipliers, paid time off and unpaid leave weeks.
Work out the hourly rate you must charge as a freelancer once non-billable time, business expenses, self-employment tax and unpaid holidays are covered.