Free credit card calculator
See how much time and interest you could save by adding extra money to your credit card payment.
Private by design - core calculations stay on your device.
For an $8,000 balance at 22% APR with a $250 current payment, compare the current plan with an additional $100 each month.
4 years 1 month
2 years 6 months
1 year 7 months
$1,695
A regular payment covers estimated interest and principal. An additional payment reduces principal sooner, so a lower balance can generate less future interest under the same APR.
Earlier payments affect more future billing periods. Real issuers may use daily interest, statement-cycle timing, fees, and allocation rules that differ from this simplified monthly estimate.
Monthly extras spread an additional contribution over time. A lump sum reduces the modeled balance in one selected month. Applying the same total amount earlier may reduce more interest because the balance decreases sooner.
The calculator does not recommend a personal amount. Compare payment scenarios you consider affordable and review the estimated tradeoff between contribution, payoff time, and interest.
Answers about monthly extras, lump sums, payoff goals, interest savings, issuer differences, and privacy.
The result depends on the balance, APR, current payment, extra amount, and timing. This calculator runs both the current plan and the extra-payment plan through the same payoff engine and displays the estimated difference.
Interest saved is the current plan's estimated total interest minus the extra-payment plan's estimated total interest. Actual issuer interest may differ because of daily rates, billing cycles, fees, purchases, and allocation rules.
A lump sum reduces the modeled balance earlier, while monthly extras spread the contribution over time. Earlier principal reduction may avoid more interest, but the result depends on amount, APR, and timing.
In this monthly model, an extra payment lowers principal in the selected month, which can reduce interest charged in later modeled months. Issuers may calculate interest daily and apply payments differently.
This calculator treats the amount above the regular scheduled payment as additional principal after monthly interest is applied. Your issuer's payment-allocation terms control actual application.
The engine reduces the final payment to the exact amount needed. It does not create a negative balance or count unused extra money as contributed.
Actual results can differ because of daily periodic rates, statement timing, fees, new purchases, variable APRs, promotional periods, and issuer-specific payment rules.
Core calculations run locally. With Functional storage allowed, the latest valid inputs may be saved in your browser and removed with Reset calculator. Financial values are not sent to analytics.
Yes, but the calculator assumes the entered APR continues for the full modeled period. It does not model a promotional end date, transfer fee, or later standard APR.
The calculator divides APR by 12, applies that simplified monthly rate to the opening balance, then applies the regular and extra payment. Real issuers may use a daily periodic rate.
Estimate one card using a fixed monthly payment.
Estimate the cost of issuer-style declining minimum payments.
Compare multiple debts and Snowball vs Avalanche.
Choose the right calculator for multiple debts, one credit card, minimum payments, or extra-payment scenarios.
Compare existing debts with a simplified consolidation scenario.
