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FIRE calculator

FIRE stands for financial independence, retire early. It means having enough invested that withdrawals could pay for your life, so work becomes optional. Your FIRE number is your yearly spending divided by your withdrawal rate, which is 25 times your spending at 4%. Answer a few questions to see the age you could get there.

FIRE estimate

Example numbers. Change them to yours.

Your 401(k), IRA, brokerage, and other investments, added up.

In today's dollars. What you spend in a year now is a fair start.

Optional. Part-time work, rent, or a pension that would cover some of that spending, the idea called Barista FIRE.

Assumptions

Nobody knows these for sure. They start at common values. Change them and watch the answer move.

How much your investments grow a year, after inflation. In past US data, a mix of 60% stocks and 40% bonds grew about 5% a year. Lower is more cautious.

The share of your investments you would spend each year. 4% is the common rule of thumb; a retirement longer than 30 years often uses less. At 4%, your number is 25 times the spending it covers.

You reach FIRE at

Age 50

Investing $2,500 a month, your balance reaches your FIRE number of $1,200,000 in 20 years. From then, your investments could pay for a $48,000 year.

Your FIRE number
$1,200,000
Enough to draw $48,000 a year at a 4% withdrawal rate
Spending it has to cover
$48,000
$48,000 a year, with no other income

What you invest, from 30 to 55

How it works: your FIRE number is the yearly spending your investments must cover ÷ withdrawal rate, so 4% means 25 times that spending. Your balance grows at the yearly growth rate, with the monthly amount added each month, until it reaches that number. Figures are in today's dollars because growth is after inflation. Social Security, taxes, and account rules are not counted. This is an estimate, not advice.

See it with your actual numbers.

These are numbers you typed. With Candor, the AI you already use, like Claude or ChatGPT, builds this page from what you really have invested, invest, and spend, and keeps it up to date.

What you ask your agent, and the page it builds in Candor

You

When could I stop working if I keep saving like this?

Your agent

Your 401(k), IRA, and brokerage account hold $142,600, and you spent $52,000 over the last 12 months. Covering that at 4% takes $1,300,000. At the $3,200 a month you have been investing, it gets there at 51. I saved a page in Candor where you can move the monthly amount and see the age change.

Written by ChatGPT

Financial independence

Live · Figures as of Sep 21, 6:12 AM

When what you invest could cover what you spend.

Financially independent at

Age 51

Invested today
$142,600
Spending a year
$52,000
FIRE number
$1,300,000

Candor with sample data.

What your agent needs
Balances, recent pay and spending, debts, and any pension or Social Security estimates you have.
What you get back
A live page showing how long your money lasts at the date you pick, with earlier and later dates beside it.
When to use it
Run it when you need it, or ask your agent to repeat it quarterly.

The prompt: When could I retire?

Copy the prompt into the AI agent you use with Candor. It works from your Candor records and asks for anything it's missing. New to Candor? Connect your agent first.

Your prompt

Help me see when I could retire. Start from my balances, recent pay and spending, and debts in Candor, and ask me only for what the records cannot show, such as a pension, a Social Security estimate, or my age. Build a live page in Candor that projects my savings and debts month by month through retirement. Let me move the retirement date and change the pension, spending in retirement, and growth assumptions on the page, and show earlier and later dates side by side. Tell me whether the goals I have saved, such as paying off a loan first, still work at that date. Show every assumption on the page, and if something the page depends on is missing, say so there instead of counting it as zero. Answer the question in our conversation too.

Nothing runs until you send the prompt to your agent.

New to Candor? Set up and start in one message

Paste this into Claude, ChatGPT, or the agent you use. It sets up Candor and walks you through approving its access and connecting your accounts, then runs the prompt from your records.

Set up Candor from https://candor.money/START.md and walk me through connecting it here. Help me see when I could retire. Start from my balances, recent pay and spending, and debts in Candor, and ask me only for what the records cannot show, such as a pension, a Social Security estimate, or my age. Build a live page in Candor that projects my savings and debts month by month through retirement. Let me move the retirement date and change the pension, spending in retirement, and growth assumptions on the page, and show earlier and later dates side by side. Tell me whether the goals I have saved, such as paying off a loan first, still work at that date. Show every assumption on the page, and if something the page depends on is missing, say so there instead of counting it as zero. Answer the question in our conversation too.

Not on Candor yet? Versions for ChatGPT and Claude.

Both versions work from the numbers you type, and the answer stays in that chat. With Candor, your agent reads your balances, what you actually invest each month, and what you actually spent over the last year from your records, and builds the page in Candor with growth and withdrawal rate as assumptions you can change. The page reads your balances each time you open it, so the age moves as you save.

For ChatGPT

Help me work out when I could reach financial independence. I'm [age], I have $[amount] invested across my retirement and brokerage accounts, I invest $[amount] a month, and I expect to spend $[amount] a year once I stop working, in today's dollars. Use a growth rate after inflation and a withdrawal rate I can change, starting at 5% and 4%. Show my FIRE number, the age I reach it, and the same at 4% growth. Then show what part-time income of $[amount] a year would change. Don't count Social Security unless I give you an estimate.

Use ChatGPT with Candor

For Claude

I want to know when I could stop needing a paycheck. My numbers: age [age], invested $[amount], adding $[amount] a month, spending $[amount] a year once I stop, in today's dollars. Work in today's dollars with a growth rate after inflation. Give me my FIRE number at a 4% and a 3.5% withdrawal rate, the age I reach each, and how a growth rate one point lower moves them. Ask before assuming anything I didn't give you.

Use Claude with Candor

What will the agent ask you?

A good agent asks before it answers. Expect questions like these, and answer the ones that matter to you.

  • What would a year cost once you stop working, in today's dollars, and would anything in it change, such as housing or health coverage?
  • Which accounts count: a 401(k), an IRA, a brokerage account, an HSA? Some cannot be drawn on without a penalty before a certain age.
  • Would part-time work, rent, or a pension cover some of that spending, and for how long?
  • How much do you invest each month now, and will that change?
  • What growth rate after inflation are you willing to assume, and what withdrawal rate fits a retirement that could last 40 years or more?

What does a good answer look like?

A worked example on sample data: one person, 34, with $142,600 across a 401(k), an IRA, and a brokerage account, investing $3,200 a month and spending $52,000 a year.

You

When could I stop working if I keep saving like this?

Your agent

Your accounts hold $142,600, and you spent $52,000 over the last 12 months. Covering that at a 4% withdrawal rate takes $1,300,000. At 5% growth after inflation, investing $3,200 a month gets you there at 51.

Your agent

Two assumptions move this most. At 4% growth instead of 5%, the age is 53. A retirement that starts at 51 could last 40 years or more, so a 3.5% withdrawal rate is worth a look: it raises the number to about $1,485,700, which you reach at 53.

Your agent

Part-time income changes it most. If work you enjoy covered $24,000 a year, the investments would only need to cover $28,000, a number of $700,000, which you reach at 44. I saved a page in Candor with the monthly amount, growth, and withdrawal rate as assumptions you can change. Social Security isn't counted.

Illustrative example with sample data, not a customer result.

What does a weak answer look like?

Your FIRE number is 25 times your annual expenses. Save aggressively, invest in low-cost index funds, and you could retire in your 40s or 50s. Use an online calculator to find your exact date.
  • It never used your balances, spending, or monthly saving, so there's no date.
  • It applies the 4% rule without asking how long the retirement would last.
  • It doesn't say which assumption moves the answer or what part-time income would change.
  • Nothing is saved, so next year you start over.

Start the projection from your real balances

A retirement projection is only as good as its starting point and its assumptions. Candor gives your agent your balances, debts, and what you actually earn and spend. You supply what the accounts cannot show, such as a pension estimate or the age you would claim Social Security. A live page keeps the projection current as your balances change, and lets you move the date yourself.

Check the answer

  • Find every assumption on the page: growth, inflation, spending in retirement, and income after you stop working. Each should be a number you can change, not a fact the page states.
  • Check that debts carry into retirement until they are paid off. A loan you plan to clear first changes the early years more than any growth rate does.

Choose a next step

Try a few dates and keep the one you are planning for as a goal. Your agent can revisit the page each quarter and tell you whether the picture moved.

Where Candor fits

Your agent works through the question with you, builds the plan, and keeps you on it. Candor gives it your real accounts, exact figures, and the goals, budget, notes, and decisions from earlier sessions, in whichever agent you use. Its review raises what's worth talking through and tells your agent why. Candor is not a licensed advisor and gives no advice; your agent does the advising, and the decisions are yours.

  • Candor connects to banks read-only and cannot move money.
  • Candor never sells your financial data or trains models on it, and you can export or delete it.
  • Every agent read and change is recorded with its reason.

Common questions

What is FIRE?
FIRE stands for financial independence, retire early. Financial independence means what you have invested could cover your yearly spending through withdrawals, so a paycheck becomes optional. Many people who reach it keep working, just on their own terms.
How do I calculate my FIRE number?
Divide the yearly spending your investments must cover by your withdrawal rate. At 4%, that is 25 times the spending, so $48,000 a year needs $1,200,000. At 3.5% it is about 28.6 times, or about $1,371,400. Use spending in today's dollars with a growth rate after inflation, so the answer stays in today's dollars too.
What is Barista FIRE?
Barista FIRE means leaving full-time work once your investments cover part of your spending, and covering the rest with part-time or other income. The investments only need to cover the gap, so the number is smaller. In the calculator's default, $20,000 a year of other income lowers the number from $1,200,000 to $700,000 and brings the age from 50 to 43.
What is the difference between lean, fat, and coast FIRE?
They differ in the spending the number covers or in when saving stops. Lean FIRE covers a lean budget, fat FIRE a generous one, so the same formula gives a smaller or larger number. Coast FIRE is having enough invested today that growth alone could reach your number by a later retirement age, so saving more becomes optional; the coast FIRE calculator works that out.
What growth rate should I use?
Use a rate after inflation, since the spending you enter is in today's dollars. In the historical data William Bengen used for his 1994 study, a mix of 60% stocks and 40% intermediate-term Treasuries returned about 8.2% a year compounded, close to 5.1% after inflation. The Federal Reserve aims for 2% inflation over the longer run. Past returns are no promise, so try a lower rate and see how far the age moves.
Is the 4% rule safe for early retirement?
Bengen's 1994 study found a 4% first-year withdrawal, raised with inflation after that, lasted at least about 35 years from every starting year he tested, and he framed it for people retiring around 60 to 65. A 1998 study in the AAII Journal tested payout periods of 15 to 30 years. Retiring at 45 can mean 45 years or more, and Morningstar's 2021 research, using forward-looking return estimates, put the safe starting rate for a 50/50 portfolio at about 3.3%. A lower withdrawal rate raises the number and pushes the age out.
Does the calculator count Social Security?
No. It counts only what you invest and any other income you enter. You can claim Social Security as early as 62, and the monthly benefit grows the longer you wait, up to 70. Social Security's own calculators estimate your benefit for each claiming age; adding it as other income from that age would lower what your investments need to cover later on.
Does Candor work this out from my accounts?
Your agent does, from your records in Candor. It reads your balances, what you invest each month, and what you spent over the last year, asks what the records can't show, like the income you would have after you stop, and builds this page in Candor with the assumptions labeled. Candor gives no advice; your agent works through it with you. Candor connects to banks read-only and cannot move money.

Sources

  1. Determining Withdrawal Rates Using Historical Data, William P. Bengen Journal of Financial Planning (Financial Planning Association)
  2. Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable AAII Journal
  3. The State of Retirement Income: Safe Withdrawal Rates Morningstar, November 11, 2021
  4. Why does the Federal Reserve aim for inflation of 2 percent over the longer run? Board of Governors of the Federal Reserve System, August 22, 2025
  5. Planning your Social Security claiming age Consumer Financial Protection Bureau, January 29, 2026
  6. Use Social Security retirement calculators to estimate your benefits USAGov, January 16, 2026

Ask it with your own numbers.

Set up Candor, then send this to the agent you already use. It answers from your real records and keeps the plan for next time.