Free debt payoff calculator
Enter your balance, interest rate, and monthly payment. Your exact payoff date appears instantly.
How the calculation works
The formula behind every debt payoff calculator is the same one banks use. Each month, interest is applied to your remaining balance, then your payment reduces it.
For a balance of B, monthly rate of r (APR ÷ 12 ÷ 100), and monthly payment of P:
Payoff month = log(P / (P − B×r)) / log(1 + r)
This is why the minimum payment trap is so dangerous: when P is barely above B×r, it takes decades.
At 19.9% APR on a €5,000 balance, the minimum payment of roughly €100/month means over 8 years to pay off. Raising that to €200/month cuts it to 2.5 years and saves over €2,400 in interest.
What actually moves your debt-free date
Three variables control your payoff date. Here's the leverage each gives you:
| Variable | Impact | How to change it |
|---|---|---|
| Monthly payment | High ✓ | Budget reallocation, side income, cutting subscriptions |
| Interest rate | High ✓ | Negotiate with creditor, balance transfer, refinance |
| Starting balance | Moderate | Lump-sum payments from windfalls, savings |
Payment amount is the most actionable lever. Even €50/month extra on a €8,000 debt at 14% APR shaves 14 months off the timeline and saves €800+ in interest. Run the numbers in the calculator above — the results are consistently surprising.
Calculating with multiple debts
The calculator above handles one debt at a time. For multiple debts — the realistic situation for most people — there are two approaches:
- Calculate each debt separately and track the total. Works, but misses the compound effect of rolling freed payments to the next debt (the avalanche/snowball strategy).
- Use an AI-powered full plan that calculates across all debts simultaneously, optimizes the payment order, and gives you a single debt-free date for everything. That's what Debt-Free.world's free plan does.
The difference matters. Someone with three debts totaling €15,000 might see a "last debt paid off" date of 2029 using method 1, but 2028 using method 2 — because rolling freed payments accelerates the final debts significantly.
See also: How to get out of debt fast — snowball vs. avalanche compared
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Debt to income ratio (DTI) calculator
Your debt to income ratio (DTI) measures how much of your monthly gross income goes toward debt payments. Lenders use it to assess financial health. You can calculate yours in 30 seconds.
Example: €1,200 monthly debt payments ÷ €3,500 gross income = 34.3% DTI
What counts as monthly debt payments: mortgage or rent, car loan, student loan, credit card minimum payments, personal loan payments, any other regular debt obligation.
What DTI number means:
| DTI | Assessment | What it means |
|---|---|---|
| Under 20% | Excellent | Strong financial position — lenders see very low risk |
| 20–35% | Good | Manageable debt load — most mortgages and loans approved |
| 36–43% | Acceptable | Upper limit for most mortgage approvals — focus on reducing |
| 44–49% | High | Difficult to get new credit — debt repayment should be priority |
| 50%+ | Critical | Majority of income goes to debt — free debt counseling recommended |
Reducing your DTI by paying off one debt — even a small one — immediately improves your borrowing capacity and financial flexibility. Use the 90-day debt plan to target the debt that lowers your DTI fastest.