Core payoff formula
The calculators estimate monthly interest by multiplying the current balance by the annual percentage rate divided by 12. The payment is then applied to interest and principal in a month-by-month simulation until the balance reaches zero.
For multiple-debt calculators, the tool adds the minimum payments and any extra monthly payment into a fixed payoff budget. It pays active minimums first, then applies remaining money to the selected target debt based on the chosen strategy.
Balance x APR / 12
Smallest balance first
Highest APR first
Monthly debt payments / gross monthly income x 100
Important assumptions
- APR is treated as a steady annual rate.
- Payments are modeled monthly, not daily.
- Extra payments are assumed to reduce principal after required payments.
- Fees, late payments, variable rates, balance transfer rules, and lender-specific payment allocation may change real results.
- Debt-to-income guidance uses common lender ranges, but approval rules vary.
Calculator results are planning estimates. They are not payoff quotes, loan offers, credit approvals, legal advice, tax advice, or financial advice. Always compare the estimate with your lender statement, servicer payoff quote, loan agreement, and official program rules before making decisions.
Privacy and data handling
The calculators run client-side in the browser. The site does not require sign-in and does not store the balances, APRs, income, or payment amounts you enter into the calculator forms.
Editorial and advertising standards
Content is written to explain payoff concepts in plain language and to avoid guaranteed promises. If this site displays ads or partner links, those placements should remain separate from calculator controls and should not be presented as financial recommendations. Advertising does not affect calculator formulas, payoff order, or educational explanations.
Future ad units should be clearly labeled as advertising or sponsored placements, should not imitate navigation or calculator buttons, and should not be positioned in a way that encourages accidental clicks. Any future affiliate relationship should be disclosed before or near the relevant link.
Reference points we use
For general debt, credit, and student loan concepts, readers should compare educational estimates with official consumer resources and account-specific documents. Useful starting points include:
- Consumer Financial Protection Bureau for consumer credit and debt education.
- Federal Trade Commission for consumer protection guidance and scam awareness.
- Federal Student Aid for federal student loan repayment information.
- Your lender, card issuer, or loan servicer for payoff quotes, APR changes, fees, payment allocation, and account-specific rules.
Educational use only
These calculators provide planning estimates, not financial advice, loan approval decisions, or official payoff quotes. Before making a financial decision, compare the estimate with your lender statement, payoff quote, loan agreement, and any relevant professional guidance.