FIRE Calculator

Estimate a FIRE target from annual spending and a withdrawal rate, then project how many years your current portfolio and savings rate may need to reach it.

Finance planning estimate

Topic review: James Whitfield

Retired Financial Planner. Assigned as the finance topic reviewer for mortgage, retirement, annuity, pension, and long-term planning calculators.

Reviewed 21 March 2026 Updated 7 March 2026 View reviewer profile Contact editorial team

Use spending to size the portfolio goal This planner estimates a FIRE target from your annual spending and withdrawal rate, then projects when your invested portfolio may catch that target if returns and savings continue.

Current invested portfolio ($)

Annual after-tax income ($) Annual spending ($)

Expected annual return (%) Annual inflation (%)

Safe withdrawal rate

Custom withdrawal rate (%)

Display currency

Switch the display currency for targets and portfolio values without changing the projection math.

Currency

Assumptions

This planner keeps your savings rate constant by inflating both spending and contributions over time. It does not model taxes in retirement, Social Security, pensions, or portfolio sequence risk.

Result

16 years

Estimated time until the projected portfolio matches the inflation-adjusted FIRE target.

FIRE target today: $1,500,000.00
Savings rate: 50%
Annual contribution: $60,000.00
Current target coverage: 10%

Target at independence

$2,226,758.43

Inflation-adjusted portfolio goal implied by annual spending and a 4% withdrawal rate.

Monthly portfolio income at FIRE

$7,999.01

Estimated monthly spending supported by the selected withdrawal rule at the projected FIRE portfolio.

Planner readout

Saving $5,000.00 per month on average keeps the current savings rate intact. If spending rises faster than planned or returns arrive later than expected, the timeline will extend.

Projection path

Year	Portfolio	FIRE target	Contribution	Spending
1	$220,500.00	$1,537,500.00	$60,000.00	$61,500.00
2	$297,435.00	$1,575,937.50	$61,500.00	$63,037.50
3	$381,292.95	$1,615,335.94	$63,037.50	$64,613.44
4	$472,596.89	$1,655,719.34	$64,613.44	$66,228.77
5	$571,907.45	$1,697,112.32	$66,228.77	$67,884.49
6	$679,825.46	$1,739,540.13	$67,884.49	$69,581.61
7	$796,994.85	$1,783,028.63	$69,581.61	$71,321.15
8	$924,105.64	$1,827,604.35	$71,321.15	$73,104.17
9	$1,061,897.21	$1,873,294.45	$73,104.17	$74,931.78
10	$1,211,161.79	$1,920,126.82	$74,931.78	$76,805.07
11	$1,372,748.19	$1,968,129.99	$76,805.07	$78,725.20
12	$1,547,565.76	$2,017,333.24	$78,725.20	$80,693.33
13	$1,736,588.69	$2,067,766.57	$80,693.33	$82,710.66
14	$1,940,860.56	$2,119,460.73	$82,710.66	$84,778.43
15	$2,161,499.23	$2,172,447.25	$84,778.43	$86,897.89

About this calculator

Finance planning estimate Reviewed 21 March 2026 Updated 7 March 2026

Topic review

James Whitfield

Retired Financial Planner. Assigned as the finance topic reviewer for mortgage, retirement, annuity, pension, and long-term planning calculators.

Formula provenance

The methodology summary explains the formula family in use, and the source list points to the primary or authoritative references checked for this topic.

Methodology

Uses annual spending and the selected withdrawal rate to estimate a target portfolio, derives annual contributions from income minus spending, then projects portfolio growth year by year while inflating both spending and contributions to keep the savings rate constant.

Limitations

Assumes one constant return rate, one inflation rate, and one withdrawal rate for the full planning horizon.
Does not model taxes, Social Security, pensions, healthcare shocks, sequence-of-returns risk, or changing asset allocation.
The 80-year simulation window is a planning bound, not proof that a scenario is impossible beyond that period.
This is a retirement-planning estimate only and not a recommendation to retire or to use any specific withdrawal rule.

Disclaimer

Use this timeline as a planning scenario only. Before making retirement decisions, compare it with a fuller retirement plan that includes taxes, longevity risk, and market downside scenarios.

Primary finance sources

Investor.gov — Compound interest calculator — Official investor tool supporting the role of compounding and contributions in long-run portfolio growth.
FINRA — Investment returns — High-trust investor guidance supporting caution around return assumptions and performance framing.
FINRA — Tips for new investors — High-trust investor guidance reinforcing that diversification, time horizon, and risk discipline matter in long-run planning.

Change notes

Finance change note: the formula, tax or rate assumptions, source set, disclaimer, and planning guidance for this calculator were last reviewed on 2026-03-21. Report a correction at contact@calcipedia.org; substantive rule or assumption changes refresh both the reviewed date and the updated date shown on the page.

See our calculation methodology and editorial standards, plus the editorial contact route, for how this estimate is produced and corrected.

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Retirement Planning

FIRE calculator guide: portfolio target and years to financial independence from spending

A FIRE calculator turns annual spending into a portfolio target, then projects how long it may take to reach that target using current invested assets, an assumed return, a withdrawal rule, and the savings rate implied by income minus spending. It is useful for planning, but it should be treated as a range-based retirement scenario rather than a promise that one rule will work in every market.

What FIRE is trying to measure

FIRE stands for financial independence, retire early. The core question is not how much income you earn today, but how much annual spending a portfolio may need to support once paid work becomes optional. That is why most FIRE planning starts with spending and only then works backward into a target portfolio.

This calculator keeps that structure. It uses annual spending and a withdrawal rate to size the target, then checks how long current assets plus annual savings may take to catch that target if inflation and investment returns continue at the selected rates.

Core FIRE maths

The basic FIRE target comes from dividing annual spending by the chosen withdrawal rate. A 4% withdrawal rule, for example, implies a target equal to 25 times annual spending because 1 divided by 0.04 equals 25.

The timeline then depends on three forces working together: how much you already have invested, how much you save each year, and how quickly the portfolio compounds. Inflation matters too, because the spending target usually needs to grow if prices rise over time.

FIRE target = Annual spending / Withdrawal rate

Converts annual spending into the portfolio size implied by the selected withdrawal rule.

Annual contribution = Annual income - Annual spending

Estimates how much new money is added each year from the current savings rate.

Next portfolio value = Current portfolio x (1 + return) + Annual contribution

Projects the portfolio forward one year at a time before comparing it with the inflation-adjusted target.

Why the savings rate matters as much as the return assumption

A high savings rate shortens the path to financial independence in two ways. It increases annual contributions now, and it lowers the future portfolio target because annual spending is lower. That is why two households earning the same income can have dramatically different FIRE timelines if their spending patterns differ.

Return assumptions still matter, but they are not the only lever. In many realistic scenarios, reducing recurring spending or improving savings consistency moves the timeline more reliably than trying to assume a much higher investment return.

What this planner does not guarantee

The famous 4% rule is a planning shortcut, not a universal law. Taxes, asset allocation, sequence-of-returns risk, healthcare costs, pension income, Social Security, and spending changes in retirement can all change what a sustainable portfolio withdrawal looks like in practice.

Use a FIRE calculator to compare scenarios and to see how sensitive the timeline is to spending, returns, and inflation. Do not treat a single timeline as proof that retiring by a given date is safe under every market path.

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