Result
$413,327.11 Coast FIRE balance needed today
The entered assets are $213,327.11 below the modeled Coast FIRE balance. This assumes no future contributions and smooth constant return and inflation rates.
- Current invested assets
- $200,000.00
- Current Coast balance gap
- $213,327.11
- FIRE number in today's dollars
- $1,500,000.00
- Target at selected age
- $3,146,351.37
- Current assets at selected age
- $1,522,451.01
- Current assets at selected age in today's dollars
- $725,817.38
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 the invested balance needed today to reach a spending-based future target with no additional contributions.
- Output
- Browser result with print and PDF options
- Reviewed
- 2026-08-09
Result summary
Quick answer
With the sample inputs, this calculator returns $413,327.11 Coast FIRE balance needed today. Current invested assets: $200,000.00. Use $413,327.11 Coast FIRE balance needed today as the modeled balance needed today when future contributions are zero, then test conservative return, inflation, spending, and target-age assumptions.
This solves the no-future-contribution balance
The Coast FIRE result is the balance needed today to grow to the spending-based target by the selected age when future contributions are exactly zero. It is not a monthly contribution recommendation.
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 grows the spending-based FIRE target by inflation to the selected age, then discounts that future target by the entered investment return to find the balance needed today. Future contributions are always zero in this model.
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.
Coast FIRE balance today = the spending-based target grown with inflation to the target age, divided by portfolio growth over the same years, with future contributions set to zero.
Before acting
Assumptions to check
Review the real-world details that can change the estimate.
The key inputs are Current age, Target age, Current invested assets, Desired annual spending (today's dollars), Planning withdrawal rate, annual spending, withdrawal assumption, return, and inflation. Future contributions are exactly zero, and the constant-rate result excludes fees, taxes, uneven returns, sequence risk, and any withdrawal guarantee.
More guidance Examples, methodology, and planning checks Open the worked example, review notes, reference tables, and practical next checks.
When to round up
Raw values determine whether the current balance meets the Coast number before displayed money rounds to cents. Returns, inflation, spending, fees, taxes, market sequence, and withdrawal sustainability can differ from the smooth scenario.
When to use this calculator
- Estimating the balance needed today to reach a selected age without future contributions
- Checking a current balance against that modeled Coast FIRE threshold
- Comparing target-age, spending, return, and inflation assumptions
Tips for better estimates
- Keep future contributions at zero when interpreting Coast FIRE.
- Test a later or earlier target age and conservative rates.
- Compare the current-balance gap with the option to keep contributing.
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 and target ages, current assets, spending, withdrawal assumption, return, inflation, the no-future-contribution rule, fees, taxes, and market 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; Target age: 65; Current invested assets: $200000; Desired annual spending (today's dollars): $60000 /year; Planning withdrawal rate: 4 %; Assumed annual return: 7 %; Assumed annual inflation: 2.5 %. With those values, the calculator returns $413,327.11 Coast FIRE balance needed today. The entered assets are $213,327.11 below the modeled Coast FIRE balance. This assumes no future contributions and smooth constant return and inflation rates.
Example scenarios
- Use $413,327.11 Coast FIRE balance needed today as the balance-needed result only when future contributions are deliberately set to zero.
- Change the target age to see how additional compounding time changes the amount needed today.
- Compare the current-balance gap with the FIRE Calculator before deciding whether or how long to keep contributing.
Quick reference chart
| Sample result | $413,327.11 Coast FIRE balance needed today |
|---|---|
| Current invested assets | $200,000.00 |
| Current Coast balance gap | $213,327.11 |
| FIRE number in today's dollars | $1,500,000.00 |
| Target at selected age | $3,146,351.37 |
| Best next step | Compare the balance-needed result with the no-future-contribution assumption, then test lower returns, higher inflation, a different target age, fees, taxes, and whether continued saving is still appropriate. |
FAQs
Coast FIRE Calculator questions
What does Coast FIRE mean in this calculator?
It is the balance that could grow to the entered future spending target without any additional contributions, assuming the entered constant return and inflation rates occur.
Does reaching the Coast FIRE number mean I can retire today?
No. The number is designed to reach a target at the selected future age. It does not fund spending between now and then.
Are future contributions included?
No. They are deliberately zero. Use the FIRE Calculator for a timeline with ongoing fixed contributions or the Retirement Calculator for an age-based contribution projection.
Is the withdrawal rate guaranteed to work?
No. It only sets the modeled target. Market sequence, taxes, fees, longevity, inflation, allocation, healthcare, and flexible spending affect real outcomes.
More resources Saved tools, citations, and additional links Open optional follow-ups, common mistakes, citation details, and more calculators.
Saved tools
Saved calculators
- No saved calculators yet.
Recent tools
Recent calculators
- Recent calculators will appear here.
Common planning mistakes
Including future contributions, comparing unlike dollar bases, assuming a smooth return, ignoring fees and taxes, and treating the Coast balance as proof that no more saving is appropriate.
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, "Coast FIRE Calculator", last updated August 9, 2026, https://everydaycalc.org/calculators/coast-fire-calculator/Was this calculator helpful?
Suggest an improvementNotice an issue with this calculator? Contact us here.