Estimate your financial independence number.
Explore how much your investments may need to support your spending, and how your savings pace, returns and inflation could affect the timeline.
This is a simplified projection, not a promise of investment performance or a recommendation to retire.
Your FIRE assumptions
Enter the yearly spending your investments need to cover, after accounting for other reliable income.
Method: today's FIRE target = annual spending to cover ÷ withdrawal rate. The timeline projects monthly contributions and a smooth assumed return while increasing the target with inflation. Taxes, fees and changing market conditions are not modelled separately.
Financial independence outlook
Enter all six assumptions to see your estimated FIRE number, current progress and possible timeline.
How to use a FIRE calculator thoughtfully
Financial independence is a relationship between the cost of your lifestyle, the resources available to fund it and the uncertainty you can tolerate. Treat the output as a starting point for scenarios, not a deadline to follow blindly.
1. Define the yearly spending your portfolio must cover
Start with a realistic annual budget for the lifestyle you want to maintain. Include housing, food, transport, insurance, healthcare, family support, travel and irregular costs. If a pension or other reliable income will cover part of that spending, subtract only the portion you reasonably expect to receive and sustain.
Use a separate buffer for large one-off costs where appropriate. Spending can also change after work ends, so test a higher-expense scenario rather than assuming today's budget will remain exact.
2. Understand the withdrawal-rate trade-off
The withdrawal rate converts spending into a target portfolio. At 4%, the simple arithmetic is 25 times annual expenses; at 3%, it is about 33.3 times expenses. A lower rate increases the target and may provide more room for uncertainty, but no rate guarantees success.
Historical withdrawal research depends on the period studied, portfolio mix, retirement length and spending adjustments. Taxes, fees, market valuations and local inflation may differ from those assumptions.
3. Test return and inflation together
Returns and inflation both matter: investment growth may increase the portfolio, while rising costs increase the amount it needs to support. The model uses a steady annual return converted to a monthly rate and raises spending smoothly with inflation. Real markets move unevenly, and a loss early in retirement can have a very different effect from the same average return in another order.
Try lower returns, higher inflation and a lower withdrawal rate. If your plan only works with optimistic assumptions, it may be too fragile.
4. Treat the timeline as adjustable
Regular contributions can matter as much as investment growth, especially early on. You can compare a larger monthly contribution, a more modest spending plan or a later target date. Do not assume that taking more risk is the only way to close a gap.
Review the plan when your income, dependants, health needs, housing costs or goals change. A practical plan should allow for uncertainty rather than depend on one precise FIRE date.
5. Plan for risks the simple number cannot capture
- Taxes, fund expenses, trading costs and withdrawal rules.
- Unexpected healthcare, family, housing or repair costs.
- Market downturns near the point you stop earning employment income.
- Longer-than-expected retirement and changing spending patterns.
- Whether other income sources are reliable and inflation-linked.
Worked example
If your portfolio needs to cover 600,000 in yearly spending in your chosen currency and you use a 4% withdrawal rate, the simple FIRE target is 15,000,000 before considering inflation, taxes, fees or a safety margin. This is an illustration of the formula, not a recommendation about how much you personally need.
FIRE calculator FAQs
Understand the assumptions behind the number before using it to make a long-term decision.
What is financial independence?
Financial independence means having enough resources to support your chosen spending without depending entirely on employment income. The amount varies with expenses, other reliable income, risk tolerance, taxes, health costs and how long the money needs to last.
Is the 4% rule safe for everyone?
No. The 4% rule comes from historical retirement research with specific assumptions and is not universal. Market valuations, asset mix, fees, taxes, inflation, location, retirement length and spending flexibility can all change the outcome. Test different rates rather than relying on one figure.
What return should I enter?
Use a cautious long-term nominal return assumption that reflects your intended portfolio and remember that actual returns vary. Try lower-return scenarios too. The calculator does not forecast market performance or subtract personal taxes and investment fees separately.
What if the calculator cannot reach my target?
The projection checks up to 80 years under your assumptions. If it does not reach the inflation-adjusted target within that horizon, consider testing a higher contribution, lower spending, a different timeline or more conservative assumptions. Do not treat a long-range projection as a promise.
How is my FIRE target calculated?
This calculator divides the annual spending your portfolio needs to cover by the withdrawal rate you choose. For example, at a 4% rate, the simple estimate is 25 times that yearly spending. It is a planning heuristic, not a guarantee that a portfolio will last.
How does inflation affect my future spending target?
Inflation increases the future cost of the same lifestyle. The calculator raises your target expenses each month using the annual inflation assumption while projecting your investments using the return assumption you enter. Actual returns and inflation will not follow a smooth path.
Does this include a pension or other reliable income?
Not separately. Enter the annual spending that your investments need to cover after accounting for other income you expect to rely on. If that income may change or stop, consider testing a higher expense target.
Does this calculator provide financial advice?
No. It is an educational estimate based on the inputs you supply. It does not assess your full circumstances, recommend investments or account for every tax, pension, healthcare or withdrawal rule. Consider qualified advice for decisions that depend on your personal situation.
Educational estimate only. This calculator does not recommend an investment strategy or guarantee a financial independence date.