Credit Card Payment Calculator
This credit card payment calculator estimates how long a balance would take to repay with a fixed monthly payment, or estimates the fixed monthly payment needed for a chosen number of months. It uses a simplified fixed-rate monthly amortization model, so it is best used for planning and scenario comparison rather than as a prediction of an issuer’s exact statement balance.
Actual credit cards can calculate interest daily using an average daily balance, can have multiple APRs, fees, promotional terms, minimum-payment rules, and new transactions. The worked examples below show how the simplified model behaves when those additional account features are excluded.
Quick answer
For this simplified model, monthly rate r = APR ÷ 12 ÷ 100. With starting balance B and fixed monthly payment P, estimated payoff time is n = −ln(1 − rB/P) ÷ ln(1+r). Solving the same model for a target number of months gives P = rB ÷ (1 − (1+r)^−n). This is not an issuer-specific statement calculation: many card issuers accrue interest daily and account terms can include fees, multiple APRs, promotional balances and changing minimum payments.
How to Use This Credit Card Payment Calculator
Three inputs are all it takes. Once you have your latest statement handy, the calculator does the rest.
Enter your balance and APR
Use the balance and APR shown for the balance you want to model. If your account has multiple APRs or promotional balances, this single-rate model cannot reproduce the issuer’s exact calculation.
Choose a direction
Pick “Find Payoff Time” if you already know what you can pay each month, or “Find Monthly Payment” if you have a target payoff date in mind instead.
Read your results
The calculator returns a modeled payoff timeline, interest estimate, and total paid so you can compare simplified fixed-payment scenarios.
Two Directions, One Balance
Switch modes depending on which number you’re solving for, and use the APR pills to skip typing common credit card rates.
Find Payoff Time
Enter a starting balance, APR, and fixed monthly payment to estimate payoff time and interest under this simplified monthly-compounding model.
Find Monthly Payment
Enter a starting balance, APR, and target number of months to estimate the fixed monthly payment required under the same simplified assumptions.
The formula behind the numbers
Both directions use the same fixed-rate amortization relationship with r = APR ÷ 12 ÷ 100 as the modeled monthly rate.
Why payoff isn’t linear
Within this model, interest is applied to the remaining balance each month. Real card issuers may instead accrue interest daily, which is one reason actual statements can differ.
Three Fixed-Payment Scenarios
Each illustrative example uses the same $5,000 starting balance and 24.99% APR. The results follow this page’s simplified monthly-compounding model, not an issuer-specific daily-balance calculation.
$150 monthly payment
Modeled interest: about $3,622. Actual issuer results can differ because credit-card interest and account terms are more complex.
$200 monthly payment
Modeled interest: about $2,135. This example is for comparing scenarios, not predicting an exact statement payoff date.
$300 monthly payment
Modeled interest: about $1,205. In this simplified model, the larger fixed payment reduces both payoff time and modeled interest.
Factors That Can Change a Credit Card Payoff
These are general educational considerations. Your issuer terms and personal circumstances determine what applies to your account.
Payment amount matters
CFPB disclosures warn that making only the minimum can mean paying more interest and taking longer to repay. In a fixed-payment model, increasing the payment generally shortens the modeled payoff period.
Multiple APRs need extra care
A single card can contain balances subject to different APRs. This calculator accepts one APR, so it cannot model issuer payment-allocation rules across multiple rate categories.
New transactions change the model
New purchases, cash advances, balance transfers, fees, or promotional terms change the balance and may have different APRs, so the estimate should be recalculated when the inputs change.
Check the actual statement
Your statement and cardholder agreement are the primary sources for minimum payment, APR categories, fees, due dates, and issuer-specific interest calculations.
Credit Card Payment Calculator FAQs
What formula does this credit card payment calculator use?+
r = APR/12/100, balance B, and payment P, the number of months n to pay off the balance is n = −ln(1 − rB/P) ÷ ln(1+r). Solved the other way, the payment needed for a target n months is P = rB ÷ (1 − (1+r)^−n). If APR is 0%, it simplifies to straight division: n = B/P or P = B/n.Why does my payment need to be higher than “balance × monthly rate”?+
Does this include minimum payment rules or fees?+
Why is the total interest so high compared to the balance?+
What if the balance never gets paid off?+
Is a “credit card calculator” the same as a credit card payment calculator?+
Method, Assumptions & Limitations
For a financial calculator, transparency about what the model does not include is as important as showing the formula.
Built by Umer Farooq
Umer Farooq is the founder and developer of CalcsDone. No financial-planner, credit-counselor, or other professional finance credential is claimed on this page.
Transparent model
The calculator uses a fixed APR converted to a monthly rate and assumes a constant monthly payment. The formula and worked examples are shown so the model can be understood rather than treated as a black box.
Real cards can differ
CFPB explains that many issuers calculate interest daily using an average daily balance. Multiple APRs, fees, promotional terms, new transactions and issuer minimum-payment rules can also change actual payoff results.
Educational use
This page is a planning aid, not individualized financial, legal, debt-management, or credit-counseling advice. Use your issuer’s statement and cardholder agreement for the terms that govern your account.
See the CalcsDone Methodology for the sitewide research process. If you find an error or unclear assumption, use the Contact page.
More Finance & Payroll Calculators
You can also review the CalcsDone Methodology.
Payoff References
This calculator’s formula and terminology are grounded in publicly available consumer-finance guidance.
- How credit card companies calculate interest — Consumer Financial Protection Bureau (CFPB)
- Regulation Z §1026.7 repayment disclosures — CFPB
- Appendix M1: credit-card repayment disclosure calculations — CFPB
- Multiple APRs and payment allocation — CFPB
- How CalcsDone calculators are researched & built
The CFPB sources describe real credit-card interest and repayment disclosures. They do not state that every issuer uses this page’s simplified monthly-compounding formula; that formula is explicitly presented here as a planning model.