Free FIRE Calculators

A small suite of focused Financial Independence tools. Every calculation runs locally in your browser — your numbers never leave your device. See the methodology for the exact formulas.

Coast FIRE Calculator

Find how much you need invested today so compound growth alone funds your retirement. Quick guided mode or fully custom rates.

Reverse / Savings Calculator

Work backwards: how much to invest each month to hit Coast FIRE by a target age. Answers "what does it take to get there?"

Savings planner →

Barista FIRE Simulator

See how part-time income changes your number — modeled honestly for both a temporary bridge and permanent income.

Two models →

Pension-Adjusted Coast

A pension, annuity, or Social Security reduces what your portfolio must cover for life. Use the Barista tool’s "Permanent income" mode.

Permanent income →

Embed the calculator on your site

Add the Coast FIRE calculator to any page for free. Copy this snippet — it loads a lightweight, self-contained widget:

<iframe
  src="https://coastfirecalc.net/embed/coast-fire"
  title="Coast FIRE Calculator"
  width="100%"
  height="640"
  style="border:1px solid #e5e7eb;border-radius:16px;max-width:520px"
  loading="lazy"
></iframe>

A link back to CoastFIRECalc.net is appreciated but not required.