About My FIRE Calculators
Clear, honest FIRE calculators, with the math shown, not hidden. We built My FIRE Calculators because the tools we found were either buried in ads or hard to trust.
What we do
My FIRE Calculators makes free, fast calculators for the FIRE (Financial Independence, Retire Early) community, Coast FIRE, Barista FIRE, Lean FIRE and your full FIRE number. Every calculator updates live, works in five currencies, and shows exactly how it reached your result. No sign-up, no clutter.
Our methodology
We keep the math transparent and conventional so you can trust and check it:
- FIRE number = annual spending ÷ safe withdrawal rate (default 4%, the Trinity Study standard).
- Coast FIRE number = FIRE number ÷ (1 + real return)years to retirement.
- Real return = your expected investment return − inflation − fees, so every figure is in today's dollars.
- Projections compound your current investments plus monthly contributions forward month by month.
Defaults (7% return, 3% inflation, 4% withdrawal) are deliberately middle-of-the-road; you can change every assumption under "Advanced assumptions."
Our promise
- The calculators are free and always will be.
- We show the formula behind every number.
- We never sell your data. The calculators run entirely in your browser, your inputs never leave your device.
Get in touch
Spotted a bug or have an idea for a calculator? We'd genuinely like to hear it. Email [email protected].