Debt Payoff Calculator
Estimate a fixed-payment debt payoff timeline and the approximate interest cost under a constant APR.
Run your estimate
Change the assumptions to see how the result moves.
Visual projection
Updates as you change the assumptions.
Year-by-year breakdown
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Results are estimates for education. They are not financial, tax, legal, or investment advice.
How this calculator works
The model assumes a fixed APR, no new borrowing, no fees, and the same payment each month. Actual statements can differ because of daily interest, fees, payment timing, and changing rates.
Debt payoff calculator explained for beginners
Debt is money owed to a lender. The principal is the balance still unpaid, while interest is the price charged for borrowing. This calculator estimates how a fixed monthly payment reduces one balance over time.
The information you enter
Current balance is the amount owed today. APR, or annual percentage rate, represents the yearly borrowing cost used by this simplified calculation. Monthly payment is the fixed amount you plan to pay. The payment must first cover newly added interest; only the rest reduces the balance.
What the results mean
Payoff time estimates the number of payments needed to reach zero. Total interest is the sum of interest added during that period. Total paid is principal plus estimated interest. A higher affordable payment normally reduces both the payoff time and total interest because the balance falls sooner.
Formula and assumptions
Monthly interest = outstanding balance × APR/12New balance = outstanding balance + monthly interest − payment
The calculation assumes one debt, a fixed APR, a fixed payment, monthly interest, no new spending, no late fees and no promotional-rate changes. The final payment may be smaller. If the payment is no greater than the monthly interest, the balance will not fall under this model.
How to read the chart and yearly breakdown
The line shows the estimated balance remaining after each payment. A steeper fall means faster repayment. The yearly table shows the ending balance, interest added during that year and payments made, helping you see how early payments contain more interest when the balance is larger.
Worked example
On a $3,000 balance at 18% APR, the first month’s estimated interest is $45: $3,000 × 0.18 ÷ 12. If the payment is $100, about $45 covers interest and $55 reduces the balance. Next month’s interest is then calculated on the smaller balance.
Debt payoff calculator FAQs
What is APR?
APR means annual percentage rate. It expresses borrowing cost on a yearly basis, although lenders may calculate charges differently and may include fees.
Why is my payment too low?
If it does not exceed the interest being added, little or none of the principal is repaid. Check the lender’s actual minimum-payment and interest rules.
Why does paying extra save interest?
An extra amount reduces principal sooner. Future interest is then calculated on a smaller balance for fewer months.
Does this include fees or new purchases?
No. Late fees, annual fees, promotional rates and new charges can change the real payoff date and cost.
Which debt should I pay first?
The avalanche approach prioritises the highest APR to reduce mathematical cost. The snowball approach prioritises the smallest balance for quicker milestones. Continue required payments on every debt.
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