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Debt Payoff Calculator

Estimate payoff time for one fixed-rate balance, or find the monthly payment needed to meet a target.

01

Your balance and plan

Use one currency consistently; the calculations themselves are currency-neutral.

What would you like to find?

Inputs stay in this browser.

02

Estimated payoff

Based on a fixed APR and a payment made once each month.

Estimated payoff time—
Monthly payment—
Total interest—
Total paid—
First month's interest—

Educational estimate only. It does not model fees, new charges, changing rates, late payments, promotional periods, or a lender's daily-interest and rounding rules.

What this debt payoff calculator does

The Debt Payoff Calculator estimates the payoff schedule for one debt with a fixed annual percentage rate (APR). Enter a current balance and APR, then choose one of two questions:

  • Payoff time from my monthly payment estimates how many monthly payments remain, total interest, total paid, and first month's interest.
  • Monthly payment for a target payoff time calculates the fixed payment required to clear the balance in a whole number of months, plus estimated interest and total paid.

All calculations take place in the current browser. The page does not upload, save, or retrieve your balance or payment plan. Amounts are currency-neutral: enter every amount in the same currency and interpret the output in that currency.

This is a mathematical planning tool, not a lender statement. It assumes a fixed APR, no new borrowing, and one payment at the end of every month. It does not model fees, daily interest, promotional rates, late payments, minimum-payment policies, or lender rounding.

How to use the calculator

  1. Enter the current balance. It must be greater than zero.
  2. Enter the APR as a percentage. For example, enter 18.99, not 0.1899, for an 18.99% annual rate.
  3. Select a planning mode.
  4. In payoff time mode, enter the monthly amount you plan to pay. The payment must be larger than the first month's interest or the balance will not fall.
  5. In target payoff time mode, enter a whole number of months from 1 through 1,200 (up to 100 years).
  6. Read the headline estimate, payment, total interest, total paid, and first-month interest. Use Reset example to restore 5,000 balance, 18.99% APR, and a 200 monthly payment.

The calculator uses full precision internally and rounds displayed amounts to two decimal places. A real lender may round each month differently, so a final payoff amount can differ slightly.

Formula and assumptions

Let B be the current balance, APR the annual percentage rate, r the monthly rate, P a fixed monthly payment, and n the number of monthly payments.

r = (APR ÷ 100) ÷ 12
first month's interest = B × r

Find the payment for a target term

When the monthly rate is greater than zero, the required payment follows the standard amortizing-payment formula:

P = B × r ÷ (1 − (1 + r)^(-n))

At 0% APR, interest is zero and the formula becomes P = B ÷ n.

Find the payoff time from a payment

For a positive rate, the payment must exceed the first month's interest. The page then simulates each monthly cycle:

monthly interest = remaining balance × r
new balance = remaining balance + monthly interest − payment

It stops when the remaining balance is effectively zero, allowing the final payment to be smaller than the regular payment. Total interest is the sum of the simulated monthly interest amounts, and total paid is the sum of actual payments. This is why the result is a practical estimate rather than a promise of a lender's exact payoff quote.

Worked examples

Example: pay a 5,000 balance at 18.99% APR with 200 per month

The monthly rate is 0.1899 ÷ 12 = 0.015825. First-month interest is 5,000 × 0.015825 = 79.125, so a 200 payment reduces the balance. Enter these numbers in payoff-time mode to see the estimated number of payments, interest, and total paid. The last payment may be lower than 200 because it only needs to cover the final balance plus that month's interest.

Example: choose a 36-month payoff target

Keep the same 5,000 balance and 18.99% APR, choose target-payoff mode, and enter 36. The calculator uses the payment formula to show the consistent monthly amount needed under its fixed-rate, end-of-month assumptions. Compare it with the 200 plan before committing to a budget.

Example: zero-interest balance

For a 1,200 balance at 0% APR with a 12-month target, required payment is simply 1,200 ÷ 12 = 100 per month. Total interest is zero. A promotional rate can still have conditions or an expiration date, so do not assume this simple case matches a credit agreement.

When this tool is useful—and when it is not

Use it for a straightforward balance where you want to compare a steady payment with a clear target. It can help you see whether a proposed payment is even high enough to reduce a balance, and it makes the trade-off between payoff speed and interest visible.

It is not a multi-debt strategy engine. It does not choose debt-snowball or debt-avalanche ordering, apply extra payments on specific dates, calculate credit scores, or replace a statement. For an installment loan with a set principal and term, use the loan calculator. For growth of money rather than payoff of debt, use the compound interest calculator. The percentage calculator is useful for quick rate or change checks.

Financial planning boundary: debt repayment can involve contractual, tax, credit-reporting, and legal consequences. Check your current statement, agreement, and lender's payoff quote before making a payment decision. If payments are difficult to make, contact the creditor or a qualified nonprofit credit counselor in your jurisdiction; this page does not provide individualized financial, legal, or credit advice.

Frequently asked questions

Why must my payment be more than first-month interest?

If the payment is equal to or less than the interest added that month, the balance stays the same or grows. A payoff date cannot be estimated under a fixed payment that does not reduce principal.

Does APR include fees?

Not in this calculator. Entering an APR produces a monthly rate by dividing by 12, but the model does not add annual fees, service charges, penalty fees, or any other costs. Read the agreement and statement for the actual balance and payoff method.

Does it use daily interest or a payment due date?

No. It assumes one end-of-month payment and applies a fixed monthly rate to the starting balance of that month. Many lenders calculate interest daily or use other timing rules, so their final figure can differ.

Can I use it for multiple debts?

Use one balance at a time. Combining debts with different APRs, terms, or payment dates hides important differences. Run separate scenarios, then use your actual statements and a plan appropriate to your situation.

Why is the final payment smaller than my planned payment?

When the simulated balance plus that month's interest is less than the usual payment, only that remaining amount is needed. The tool adds this smaller final payment to total paid rather than charging an unnecessary full payment.

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