Result
Age 58 and 4 months estimated FIRE point
The fixed nominal contribution first reaches the inflation-growing target in modeled month 280. The entered withdrawal rate is a target-setting assumption, not a safe-withdrawal guarantee.
- FIRE number in today's dollars
- $1,500,000.00
- Portfolio at modeled FIRE point
- $2,671,428.56
- Target at modeled FIRE point
- $2,668,792.35
- Prior month's portfolio
- $2,653,922.90
- Prior month's target
- $2,663,306.38
- Fixed monthly contribution
- $2,500.00
Hypothetical planning estimate only. The entered withdrawal rate, return, inflation, spending, and contribution assumptions do not guarantee a safe balance or retirement date. Fees, taxes, benefits, healthcare, and sequence risk are excluded. Read the full disclaimer.
More
At a glance
- Cost
- Free
- Login
- Not required
- Best use
- Calculate a spending-based financial-independence target and the first modeled month fixed contributions reach its inflation-growing value.
- Output
- Browser result with print and PDF options
- Reviewed
- 2026-08-09
Result summary
Quick answer
With the sample inputs, this calculator returns Age 58 and 4 months estimated FIRE point. FIRE number in today's dollars: $1,500,000.00. Use Age 58 and 4 months estimated FIRE point as the first modeled whole-month crossing under fixed nominal contributions, not as a guaranteed retirement date or sustainable withdrawal result.
This estimates a FIRE number and a modeled crossing month
The result compares current assets plus continued fixed nominal contributions with an inflation-growing spending target each month. It is not a guaranteed retirement date or a claim that the entered withdrawal rate is sustainable.
Publisher Published by EverydayCalc Editorial Editorial standards and limitations
Each calculator shows its formula and defines the inputs. Worked examples make the math checkable. The page also names the limits that can change the result.
Last calculation review:
Review scope: formula implementation, example parity, visible assumptions, source links, and result presentation. This is editorial and calculation QA, not professional financial, tax, legal, medical, engineering, or safety review.
Results are estimates based on the inputs provided and the assumptions shown on this page. For financial, tax, legal, medical, or other high-stakes decisions, verify results with a qualified professional or official source.
Instructions
How to use this calculator
Open the short walkthrough for choosing and checking inputs.
The calculator divides annual spending by the entered withdrawal rate to set today's FIRE number. It then checks each whole month until the fixed nominal contribution and portfolio first reach the same target grown by the entered inflation rate, stopping after 80 years.
Page guide
On this page
Jump directly to the part of the calculator you need.
Calculation details
Formula and methodology
See the exact math used to produce the result.
Current FIRE number = annual spending divided by the entered withdrawal-rate assumption; the FIRE month is the first whole month the unrounded portfolio reaches the same target grown with inflation.
Before acting
Assumptions to check
Review the real-world details that can change the estimate.
The key inputs are Current age, Current invested assets, Fixed monthly contribution, Desired annual spending (today's dollars), Planning withdrawal rate, annual spending, withdrawal assumption, return, and inflation. The model advances one month at a time, compares unrounded portfolio and target values, and stops after an 80-year horizon without inventing a date.
More guidance Examples, methodology, and planning checks Open the worked example, review notes, reference tables, and practical next checks.
When to round up
The raw portfolio and target determine the first crossing month before displayed money rounds to cents. Contributions stay flat in nominal dollars. The model excludes taxes, fees, market sequence, changing spending, income after FIRE, healthcare, and withdrawal sustainability.
When to use this calculator
- Estimating a spending-based FIRE number
- Finding the first modeled whole month continued contributions reach an inflation-growing target
- Comparing contribution, spending, return, and inflation scenarios
Tips for better estimates
- Use a sustainable spending estimate rather than current income.
- Test lower returns, higher inflation, and a spending buffer.
- Treat the crossing month as a scenario result, not a guaranteed retirement date.
How this calculator is reviewed
This page is checked for inputs, formulas, examples, assumptions, topic fit, and related links. For this calculator, the review also covers current age and assets, fixed nominal contributions, spending, withdrawal assumption, return, inflation, first-month threshold, the 80-year horizon, fees, taxes, and sequence risk.
The sample result is covered by automated tests, and the page links to related calculators and, where available, supporting guides so readers can check the assumptions before acting. If a formula, label, or assumption looks off, send the page URL and your inputs through the contact page.
Sources to verify assumptions
Use these official and consumer-reference sources to check the terms and rules behind the inputs. The calculator result still depends on the values and method you select.
Worked example
Example inputs: Current age: 35; Current invested assets: $200000; Fixed monthly contribution: $2500 /month; Desired annual spending (today's dollars): $60000 /year; Planning withdrawal rate: 4 %; Assumed annual return: 7 %; Assumed annual inflation: 2.5 %; Contribution timing: End of each month. With those values, the calculator returns Age 58 and 4 months estimated FIRE point. The fixed nominal contribution first reaches the inflation-growing target in modeled month 280. The entered withdrawal rate is a target-setting assumption, not a safe-withdrawal guarantee.
Example scenarios
- Use Age 58 and 4 months estimated FIRE point as the first modeled crossing point under the entered fixed contribution and inflation-growing target.
- Compare a lower-spending scenario with a higher-spending scenario on the same page instead of treating Lean FIRE or Fat FIRE as different formulas.
- Rerun lower-return and higher-inflation cases and keep a margin for taxes, healthcare, fees, and uneven markets.
Quick reference chart
| Sample result | Age 58 and 4 months estimated FIRE point |
|---|---|
| FIRE number in today's dollars | $1,500,000.00 |
| Portfolio at modeled FIRE point | $2,671,428.56 |
| Target at modeled FIRE point | $2,668,792.35 |
| Prior month's portfolio | $2,653,922.90 |
| Best next step | Treat the modeled crossing month as a scenario checkpoint, then test lower returns, higher inflation and spending, taxes, healthcare, benefits, fees, and a margin for uneven markets before changing work plans. |
FAQs
FIRE Calculator questions
Is the FIRE number a guarantee that I can stop working?
No. It is annual spending divided by an entered withdrawal rate. Real sustainability depends on market sequence, taxes, fees, inflation, longevity, allocation, healthcare, and spending flexibility.
Why does the FIRE target grow over time?
Annual spending is entered in today's dollars, so the model grows the target by the entered inflation rate while the nominal portfolio grows by the entered return.
Does the monthly contribution rise with inflation or income?
No. It stays fixed in nominal dollars. Model a higher fixed amount separately if you expect contributions to increase.
Are Lean FIRE and Fat FIRE separate formulas?
No. Those labels usually reflect different spending assumptions. Change annual spending on this page instead of treating them as separate mathematical models.
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Common planning mistakes
Treating the FIRE number as guaranteed, comparing unlike dollar bases, assuming fixed contributions and smooth returns, ignoring sequence risk, and presenting the modeled crossing month as a certain retirement date.
Cite or embed this calculator
If this calculator helps a blog post, classroom resource, forum answer, seasonal guide, or local planning page, link to the canonical calculator URL so readers can run their own numbers and check the assumptions.
EverydayCalc.org, "FIRE Calculator", last updated August 9, 2026, https://everydaycalc.org/calculators/fire-calculator/Was this calculator helpful?
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