Guide
What a FIRE number actually is
A FIRE number is the nest-egg estimate that could cover your planned annual spending at a chosen withdrawal rate. It is a planning heuristic, not a promise. This guide shows the math, the assumptions people skip, and how Iron Wealth connects the target to a live net worth.
The 4% shorthand, and why it is not a law
People quote a 25× rule because 1 ÷ 0.04 = 25. That came from historical US portfolio studies, not from your currency, your fees, or your life. Treat it as a starting model. Iron Wealth’s free web calculator lets you change spending and withdrawal rate in the currency you think in.
Net worth is the daily habit; FIRE math is the model
Independence planning fails when the target lives in a sheet and the balances live in five apps. Track accounts and liabilities every week. Use the website FIRE number calculator when you want a quick target. In-app FIRE tools, forecasts, and what-ifs are Pro.
Multi-currency FIRE is a real case
If you will spend in GHS or EUR and hold USD assets, the number has an FX assumption inside it. Dual display and per-account currency keep the inputs honest. Educational software only: Iron Wealth is not an advisor.
Questions
- Is the website FIRE calculator free?
- Yes. No account required. The in-app FIRE planner, forecasts, and what-ifs are Pro.
- Does a FIRE number guarantee I can retire?
- No. It is a planning estimate. Markets, inflation, spending, and health can all miss the model.
- Can I model FIRE in GHS, NGN, or EUR?
- Yes. Use the currency you plan to spend. Dual display helps if assets sit elsewhere.
Run the free calculator, then keep the live net worth in Iron Wealth so the target has a daily number next to it.
