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Debt Repayment Planner

Debt Payoff Calculator

Calculate debt payoff time, total interest, and the impact of extra monthly payments. This free debt payoff calculator helps you estimate how long it will take to become debt-free.

Enter debt details

Add your balance, interest rate, and payment details to estimate payoff time.

Current balance

Interest rate (%)

Monthly payment

Extra monthly payment (optional) Optional extra amount paid each month toward principal.

Calculation mode

Target payoff months Only used in target payoff mode.

Estimated Payoff Time

0 mo

Estimated time to pay off the balance with your current payment plan.

Total Interest

Total Paid

Debt-Free Date

—

Interest Saved

Debt payoff breakdown

Current balance $0

Monthly payment $0

Extra monthly payment $0

Total monthly payment $0

Interest rate 0%

Total payoff cost $0

Principal vs. interest

Principal

Interest

How this debt payoff calculator works

This calculator estimates how long it will take to pay off a debt balance based on your interest rate and monthly payment. You can also add an extra monthly payment to see how much time and interest you may save.

If you choose target payoff mode, the calculator estimates the monthly payment needed to become debt-free within a certain number of months.

What does this calculator show?

Payoff time: How long it may take to eliminate the balance
Total interest: Interest paid over the repayment period
Total paid: Principal plus total interest
Interest saved: Reduction in interest from extra payments

Common uses

Plan credit card payoff
Estimate loan payoff time
Test extra payment strategies
Set a target debt-free date

Debt payoff formulas

The calculator uses standard amortization math and monthly compounding:

Monthly Interest Rate = Annual Interest Rate ÷ 12 Interest Each Month = Current Balance × Monthly Interest Rate Principal Paid = Monthly Payment − Monthly Interest New Balance = Current Balance − Principal Paid Total Paid = Principal + Total Interest Target Payment (amortized debt) = P × [ r(1 + r)^n ] ÷ [ (1 + r)^n − 1 ]

Example

If your balance is $10,000, your interest rate is 18%, and your monthly payment is $300, the calculator estimates how long payoff may take and how much interest you could pay over time.

Debt Payoff Calculator FAQ

How does an extra payment help?

Extra payments reduce principal faster, which lowers future interest charges and can shorten payoff time.

Can I use this for credit cards?

Yes. This calculator works well for credit card balances, personal loans, and other debts with a known balance, interest rate, and payment amount.

What if my payment is too low?

If your monthly payment does not cover the monthly interest, the balance will not go down. The calculator will show that payoff is not possible with that payment level.

What is target payoff mode?

Target payoff mode estimates the monthly payment needed to eliminate the debt within the number of months you choose.

Does this calculator include fees?

No. It focuses on balance, interest, and monthly payments. Additional lender fees are not included unless you add them to the balance yourself.