Inputs

Loaded your last inputs

Current balance ($)

APR (annual interest %)

Monthly payment ($)

Optional extra payment ($)

Leave blank or enter 0 if you only want to estimate interest under your current payment.

Uses standard amortization math. Estimates only.

Results

Estimated first-month interest

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Approximate interest charge for the first month at the current balance.

Approximate yearly interest

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Simple annual estimate if the balance stayed the same all year.

Total interest until payoff

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Based on your entered payment.

Total paid

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Principal + interest.

Estimated payoff date

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Based on starting this month.

Time to payoff

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Interest portion

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Estimated amount of your next payment absorbed by interest.

Principal portion

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Estimated amount of your next payment reducing the balance.

Payment going to interest

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Share of your next payment that is not reducing principal.

Scenario loaded from shared link.

How this model works (assumptions) +

Interest accrues monthly using APR ÷ 12.
Payments are modeled once per month at end-of-month timing.
First-month interest is an estimate based on the starting balance and APR.
Approximate yearly interest assumes the same balance is carried for the full year.
Total interest until payoff is based on your entered monthly payment and optional extra payment.
The payment breakdown shows an estimate of how much of your next payment goes to interest versus principal.
The minimum payment note uses a common estimate of 2% of balance with a $25 floor. Actual card issuer minimum rules vary.
No late fees, annual fees, promo rates, penalty APR changes, or issuer-specific daily balance methods are included.

These quick guides explain how interest adds up on common credit card balances.

$5,000 balance How much interest does a $5,000 credit card balance cost? $10,000 balance How much interest does a $10,000 credit card balance cost? $15,000 balance How much interest does a $15,000 credit card balance cost? $20,000 balance How much interest does a $20,000 credit card balance cost? $30,000 balance How much interest does a $30,000 credit card balance cost?