Fire
Result
Fire — free online calculator.
Formula
- Fire calculates its result from Expenses, Rate, Portfolio, Current, Savings Rate. It uses the formula Portfolio Needed = Expenses / 0.04; Years = Log((Portfolio × Rate) / (Current × Rate + Expenses × Savings Rate)) / Log(1 + Rate). Change any input to recalculate the result instantly.
- The main inputs are Expenses, Rate, Portfolio, Current, Savings Rate. Enter them in the units and format shown in the calculator.
- Use monetary amounts, rates and time periods exactly as labeled; the result reflects the assumptions entered on this page.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Fire
- Expenses: 2
- Rate: 0.05
- Portfolio: 4
- Current: 5
- Savings Rate: 5
Using Expenses = 2, Rate = 0.05, Portfolio = 4, Current = 5, Savings Rate = 5, the calculated result is -80.6866647209.
Sample result: Calculating…
Frequently asked questions
What does the Fire calculate?
Fire — free online calculator.
Which values should I enter?
Enter Expenses, Rate, Portfolio, Current, Savings Rate using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Portfolio Needed = Expenses / 0.04; Years = Log((Portfolio × Rate) / (Current × Rate + Expenses × Savings Rate)) / Log(1 + Rate).
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.