Debt Calculator
Debt Payoff Calculator
Estimate how long it will take to pay off debt and how much interest an extra monthly payment could save.
Use the Debt Payoff Calculator
Your results
- Payoff time
- 0 months
- Total interest paid
- $0.00
- Total amount paid
- $0.00
- Interest saved from extra payment
- $0.00
Payoff Schedule
How this calculator works
- What it does
- Estimate how long it will take to pay off debt and how much interest an extra monthly payment could save.
- Inputs used
- The estimate uses debt balance, annual interest rate (%), monthly payment, and extra monthly payment.
- Calculation approach
- The calculator applies the relationships defined for the debt payoff calculator to those inputs and updates payoff time, total interest paid, total amount paid, and interest saved from extra payment.
- How to read the result
- Treat the result as a scenario based on the values entered. Compare a few reasonable inputs and consider costs, taxes, timing, or risks that the calculator does not include.
How to Use This Calculator
- Enter Debt balance and Annual interest rate (%) using values that match the scenario you want to evaluate.
- Enter Monthly payment and Extra monthly payment using values that match the scenario you want to evaluate.
- Review the assumptions for the debt payoff calculator, especially rates, time periods, and optional amounts.
- Select Calculate to update the results, then adjust one input at a time to compare scenarios.
Understanding the Results
- Payoff time
- The estimated time needed to reach the target under the current contribution, payment, and growth assumptions.
- Total interest paid
- The estimated cost created by the entered rate over the selected period.
- Total amount paid
- The combined amount estimated from the recurring values and time period in this scenario.
- Interest saved from extra payment
- The interest saved from extra payment estimated by the Debt Payoff Calculator using debt balance, annual interest rate (%), and monthly payment and the other values entered.
Common Mistakes
- Entering an annual interest rate as a monthly rate, or leaving out fees and required payments.
- Assuming the quoted monthly payment includes taxes, insurance, or other costs when it may cover principal and interest only.
- Ignoring whether a payment is high enough to cover the interest added each month.
- Comparing payments without also comparing payoff time and total cost.
Worked Example
Example inputs
- Debt balance
- $15,000
- Annual interest rate (%)
- 18%
- Monthly payment
- $400
- Extra monthly payment
- $100
Example results
- Payoff time
- 3 years, 5 months
- Total interest paid
- $5,077.47
- Total amount paid
- $20,077.47
- Interest saved from extra payment
- $2,132.96
With these example payments and rates, the payoff time is 3 years, 5 months. Actual payoff timing can change with fees, rate changes, missed payments, or additional charges.
Frequently asked questions
How does the Debt Payoff Calculator work?
It adds monthly interest to the remaining balance, subtracts your payment, and repeats the process until the debt is paid. It compares that schedule with one that includes your extra payment.
Why can a debt payoff be unreachable?
If the monthly payment does not exceed the interest added each month, the principal will not decline. Increasing the payment or reducing the interest rate is necessary to create a payoff path.
How do extra payments reduce interest?
Extra payments reduce principal sooner. Because future interest is calculated from a smaller balance, you can pay less interest and become debt-free earlier.
Does this calculator include fees or changing rates?
No. It assumes a fixed interest rate and monthly payments with no late fees, annual fees, promotional rate changes, or new charges.
Should I pay the highest-rate debt first?
Paying the highest-rate debt first generally minimizes interest, while paying the smallest balance first may provide faster motivational wins. Keep minimum payments current on every debt.
What does the Debt Payoff Calculator calculate?
Estimate how long it will take to pay off debt and how much interest an extra monthly payment could save. The result is based only on the inputs and assumptions shown on the page.
How should I interpret the payoff time from the Debt Payoff Calculator?
Use it as an estimate for the scenario entered, not as a guarantee or personal recommendation. Test changes to debt balance, annual interest rate (%), and monthly payment to see which assumptions have the greatest effect.