This calculator is for general information only and is not financial, tax, lending, investment, or legal advice. Actual loan terms, rates, fees, taxes, and qualification rules can vary by lender, country, and personal situation.
Beginner guide
This starts with monthly cash flow
FIRE is not only a big target number. The first question is whether money is left over each month after spending and debt payments.
Enter the amount you already plan to save each month. The loan payment is limited to what remains after salary, side income, spending, and that savings amount.
- If there is no cash left for loan payments, the debt will not disappear and FIRE will not be shown.
- Debt principal raises the target because it still has to be dealt with.
- FIRE is counted only after the debt is paid off.
Use this as a direction check, not a promise
A FIRE estimate depends on return rate, spending, income, debt interest, and the target asset amount. Any of those can change.
The useful part is the crossover: the point where projected assets meet the target after debt is considered.
Formula
Cash after spending = salary + side income - spending. Monthly loan payment cannot exceed cash after spending minus monthly savings. FIRE is counted only after debt is paid off and invested assets reach the desired retirement assets.
Example
If salary plus side income minus spending leaves $5,500 and monthly savings are $2,500, the loan payment can be up to $3,000. FIRE is reached only after the loan is gone.
Result notes
- Results are estimates based on the values you enter.
- Calculators with schedules show how values change over time.
- For financial, health, or construction decisions, compare these estimates with professional advice when needed.
Frequently asked questions
How is this different from a retirement calculator?
A retirement calculator projects savings at a chosen age. This FIRE calculator finds when invested assets cross the target after loan repayment is modeled.
Why include loan principal?
Remaining debt is added to the FIRE target, then gradually falls as monthly payments reduce the loan balance.
Is this guaranteed?
No. It is a planning estimate. Investment returns, spending, income, taxes, and debt terms can change.