FINANCIAL INDEPENDENCE • SAVINGS • REAL RETURN

FIRE Calculator

Estimate your path to financial independence with a real-return model, savings scenarios and a clear FIRE target.

FIRE number—

Estimated time to FIRE—

Estimated FIRE age—

Expected real return—

Current monthly investment—

Monthly investment for target horizon—

What this means

Portfolio path in today’s dollars

Savings sensitivity

20% lower saving—

Current saving—

20% higher saving—

How the model works
FIRE number = annual spending ÷ withdrawal rate. The accumulation projection converts nominal return and inflation into an expected real return, then compounds the portfolio with monthly contributions.

This is a planning model, not a forecast. Returns, inflation and sustainable withdrawal rates are uncertain; taxes, fees, sequence-of-returns risk and changing spending can materially alter real outcomes.

How to calculate a FIRE target

The FIRE approach links annual spending with a planned withdrawal rate to estimate the portfolio needed for financial independence. Enter current age, portfolio value, annual spending, monthly contributions, return, inflation and withdrawal assumptions. FinanceTools estimates the FIRE number, time to target and required savings for a chosen horizon.

FIRE calculations are highly sensitive to long-term return, inflation and spending assumptions. They are planning scenarios rather than guarantees that a portfolio will support a particular retirement outcome.

Frequently asked questions

What does FIRE stand for?

FIRE stands for Financial Independence, Retire Early. The core idea is accumulating enough invested assets to support spending with limited reliance on employment income.

How is the FIRE number calculated?

A common planning estimate divides annual spending by the assumed safe withdrawal rate. A 4% rate, for example, corresponds to roughly 25 times annual spending.

Why use a real return?

Comparing returns after inflation keeps the projected portfolio and spending target in approximately the same purchasing-power terms.

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