๐Ÿ”ฅ FIRE Calculator

Calculate when you achieve financial independence

Current Assets ($)
Monthly Savings ($)
Target Retirement Assets ($)
Annual Return (%)
Current Age (years old)
๐Ÿ”ฅ Retirement Age
โ€”
yrs
โฑ๏ธ Years Needed
โ€”
years
๐Ÿ’ฐ Projected Assets
โ€”
$
๐Ÿ’ธ Monthly Withdrawal (4% Rule)
โ€”
Sustainable for 30+ years

๐Ÿ”ฅ What is FIRE?

FIRE stands for Financial Independence, Retire Early โ€” a lifestyle movement aimed at achieving financial freedom and retiring decades before the traditional retirement age. Originated in the US in the 2010s and spread globally.

The 4% Rule

According to the famous Trinity Study, you can withdraw 4% annually from your retirement portfolio and sustain it for 30+ years. For example, with $1M, you can withdraw $40,000/year ($3,333/month) virtually indefinitely.

Calculating Your Target Number

Your FIRE number is 25ร— your annual expenses.

  • $2,000/month โ†’ $24,000/year โ†’ target $600,000
  • $3,000/month โ†’ $36,000/year โ†’ target $900,000
  • $5,000/month โ†’ $60,000/year โ†’ target $1.5M

Types of FIRE

Lean FIRE: Minimalist retirement, target $500K-$700K.
Fat FIRE: Luxurious retirement, target $1.5M-$3M+.
Coast FIRE: Point where compound growth alone gets you there.
Barista FIRE: Semi-retirement with part-time work.

How to use

  1. Enter current assets, monthly savings, target portfolio, annual return %, and current age. Results update as you type.
  2. โ€œAdjust for inflationโ€ applies a fixed 2.5%/year assumption to reduce the monthly real return (target amount unchanged).
  3. โ€œShare resultโ€ puts inputs in the URL. See Privacy before sharing.

Reading the results

  • Retirement age = current age + (months to target รท 12, rounded).
  • Years needed = years until assets first reach the target; if assets โ‰ฅ target already, 0.0 years.
  • Projected assets = balance in the month the target is reached.
  • 4% monthly withdrawal = target ร— 4% รท 12 (reference only; not a full withdrawal simulation).

Formula & limits

Each month: assets = assets ร— (1 + monthly rate) + monthly savings, with monthly rate = annual % รท 12. Stops at 1,200 months max. No taxes, fees, housing, debt, or pension modeling.

Verified examples (inputs โ†’ UI)

โ‘  Start 0, save 1,000,000/mo, target 100,000,000, 6% annual, inflation off, age 30 โ†’ 6.8 years, retirement age 37, 4% monthly hint โ‰ˆ 333,333 (same units as target).

โ‘ก Already there: current & target both 100,000,000 โ†’ 0.0 years needed.

Edge cases

If the target is not reached within 1,200 months, retirement age and years show โ€”; only projected assets is filled. Adjust savings, return, or target.

Compound calculator ยท Simple vs compound ยท Trinity study