Debt Payoff Calculator: Estimate a Monthly Payment and Payoff Time

A debt payoff estimate is most useful when it makes its assumptions visible. The Debt Payoff Calculator works with one current balance and a fixed APR. It can estimate the payoff time for a fixed monthly payment, or calculate a consistent payment for a target number of months. The calculation stays in your browser and does not replace your creditor's statement or payoff quote.

Start with the three inputs that control the estimate

Enter the balance, APR, and either a monthly payment or a target payoff term. Keep every monetary input in the same currency. APR is entered as a percent, so 18.99 means 18.99% per year.

The tool converts the annual rate to a monthly rate:

monthly rate = (APR ÷ 100) ÷ 12

For a 5,000 balance at 18.99% APR, the first month's modeled interest is 5,000 × (0.1899 ÷ 12) = 79.125. A 200 payment therefore starts by covering that interest and reduces principal by the rest. If the payment is no larger than first-month interest, a fixed-payment plan cannot pay down the balance; the calculator flags that condition rather than inventing a payoff date.

The Consumer Financial Protection Bureau's credit-card guidance explains that credit-card interest rates are typically stated as a yearly rate, called APR. A card issuer may calculate interest daily and apply agreement-specific rules, so this simple monthly model is intentionally an estimate.

Two useful ways to plan one balance

You know the payment you can make

Choose Payoff time from my monthly payment. The page simulates monthly interest on the remaining balance, subtracts the payment, and stops once the balance is paid. It shows total interest and total paid alongside the estimated term.

This view helps test affordability. Increase the payment modestly and compare the resulting time and interest; change only one input at a time so the trade-off remains clear. A percentage calculator can help check how much a proposed payment changes from your current plan.

You know the date you want to finish

Choose Monthly payment for a target payoff time and enter a whole month count. The calculator uses the fixed-payment amortization formula:

payment = balance × monthly rate ÷ (1 − (1 + monthly rate)^(-months))

At a 0% rate, it simply divides the balance by months. The returned payment assumes no new charges and an unchanged rate. It does not mean a creditor has agreed to that schedule.

For a conventional installment loan where the amount, rate, and term are known from the start, the loan calculator is the better fit. The loan payment guide compares level payment with equal principal on the same inputs. For a balance you are trying to eliminate, the payoff tool begins from the amount currently owed instead.

Why a lender's number can differ

The calculator is deliberately narrow: fixed APR, one payment at month-end, no fees or new borrowing. Real accounts can differ because of daily interest, payment posting time, compounding conventions, balance transfers, promotional periods, annual fees, late charges, variable rates, and statement-cycle cutoffs.

For that reason, use the result to compare scenarios—not to decide the exact amount of a final payment. Check the latest statement and request the creditor's payoff amount before closing an account or sending a final payment. The CFPB says that statements show the APR for each balance category, while cardholder agreements contain general terms, pricing, and fee information. CFPB: how card interest is calculated, CFPB credit card agreements

A simple scenario check

Suppose you enter 5,000 at 18.99% APR and test a 200 monthly payment. First-month interest is about 79.13, leaving about 120.88 to reduce principal before future interest is calculated. Try the same balance and APR in target-payoff mode for 36 months to see the payment needed for that timeline. These results are generated from the stated formula and inputs; displayed money is rounded to cents.

If you are also building a savings cushion while paying debt, keep the models separate. The compound interest calculator estimates how regular contributions grow at a fixed rate; it is not a debt-repayment model and does not account for losses, fees, or taxes.

Use the estimate safely

This page is educational, not personalized financial, credit, tax, or legal advice. It does not recommend a debt order, negotiate with creditors, model minimum-payment rules, or tell you whether to borrow, consolidate, or close an account. For a repayment problem, use your statement and lender terms; consider contacting the creditor or a qualified nonprofit credit counselor in your jurisdiction.

Is the monthly payment a promise that the debt will be paid off?

No. It is a result of a fixed-rate mathematical model. A real account can have different interest timing, fees, new purchases, or changing terms. Use the creditor's official payoff quote for an actual final payment.

Can I combine multiple balances into one entry?

It is better to run each balance separately when APRs or due dates differ. Combining them can hide the interest cost and payoff behavior of each account.

What happens if the APR is zero?

The interest portion is zero. A target payment is balance divided by the chosen number of months; a fixed-payment estimate simply subtracts each payment until the balance reaches zero.