FIRE number
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FIRE Number Calculator
FIRE number = annual spend / (SWR / 100). Default $55,000 / 4% = $1,375,000. Optional current savings / spend is crude 0% runway. This is
Page updated 2026-09-14. Official source: Bengen 4% discussion (planning context)
Calculator
Calculated Results
Years of runway at 0% (from savings)
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Years the FIRE number lasts at 0%
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What the FIRE Number Calculator calculates
Annual spend divided by safe-withdrawal percent (default 4%) for a FIRE number. Optional 0% runway from current savings Enter one realistic scenario in the calculator above and read the result together with its labels and assumptions. The page is designed for a quick, repeatable estimate rather than a black-box answer.
This is a browser-side worksheet for financial planning. It does not connect to the named provider, submit a transaction, or create an account on your behalf. Save the inputs if you need an audit trail, then rerun the page when an assumption changes.
Inputs, formula, and assumptions
Use the field labels as the source of truth: enter rates as percentages, amounts in the selected currency, and dates in the format shown. Invalid or incomplete inputs should remain visible so you can correct them before copying a result.
The calculator applies the formula implied by the labels and shows the key output in plain language. Displayed values are rounded for reading; keep the copied inputs and unrounded assumptions when a later calculation needs more precision.
If the result depends on a live rate or policy, compare the value with Bengen 4% discussion (planning context) before relying on it.
How to use the result responsibly
For the next step, compare this result with Compound Interest Calculator, 401(k) Employer Match Calculator, Personal Net Worth Calculator. A second calculator is useful when you need to test a different assumption, not to manufacture false precision.
Results are estimates, not a quote, diagnosis, tax filing, legal opinion, investment recommendation, or guarantee. Check the jurisdiction, provider plan, time period, and rounding rules that apply to your real situation.
Inputs stay in your browser for this page. Do not paste passwords, payment credentials, private keys, or other secrets into any public web tool, even when the page is designed to run locally.
Frequently Asked Questions (FAQ)
What does the FIRE Number Calculator calculate?
It estimates annual spend divided by safe-withdrawal percent (default 4%) for a FIRE number. Optional 0% runway from current savings from the values you enter. Review the labels and assumptions above the result so you can tell exactly what is included.
Are these live quotes or guaranteed results?
No. The page is an in-browser estimate based on your inputs. Provider pricing, taxes, policies, exchange rates, and other external conditions can change, so confirm the live value before committing money or publishing a decision.
Are my inputs uploaded?
The calculator is designed to run in your browser and does not need an account or a server upload. Avoid entering credentials, payment details, private keys, or other secrets in any public tool.
What should I verify before using the result?
Verify the current Bengen 4% discussion (planning context), your jurisdiction or plan, and any rounding or date rule that applies. The official source link is shown above the calculator.
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