semkuCredit card payment calculator
Enter your balance, APR and payment amounts to compare fixed and minimum payments.
Calculation rules
Monthly interest is the opening balance multiplied by APR divided by 1200, with APR entered as a percentage. Interest is rounded to cents each month, with half cents rounded up, before the payment is applied. The final payment is capped at the remaining balance plus that month's interest; totals add the rounded monthly amounts.
A fixed payment stays the same until the final payment. A minimum payment is recalculated each month from the opening balance: round the percentage amount to cents, add monthly interest only if selected, then use the greater of that amount and the minimum dollar amount. Cap the payment at the balance plus interest. Use your issuer's terms for the rule; a payment that does not exceed interest cannot reduce the balance under these assumptions.
The estimate assumes one unchanged APR and a payment after interest is added each month, with no new purchases, fees or promotional rate changes. Your card issuer's actual interest calculation and minimum payment terms may differ from this model.
Frequently asked questions
- How long does a $5,000 balance take to pay off at 22.99% APR with $200 a month?
- With monthly interest rounded to cents under this model, payoff takes 35 months, total interest is $1,871.10 and total paid is $6,871.10; the final payment is $71.10.
- What is the difference between fixed and minimum payments?
- The fixed payment uses the same dollar amount until the final payment; the minimum payment is recalculated each month using the balance percentage, minimum dollar amount and interest treatment you enter.
- Which minimum payment rule should I enter?
- Use the rule in your card issuer's terms, including whether interest is already covered by the balance percentage or added to it; this calculator does not supply an issuer rule.
- Why does the result say the balance does not decrease?
- The payment does not exceed that month's interest; an equal payment leaves the balance unchanged and a smaller payment increases it under this model, so there is no payoff to report under those assumptions.
- Will this match my card issuer's statement?
- It may differ because this model applies interest monthly using APR divided by 12 and excludes fees, new purchases and rate changes; your card issuer's statement is the source of truth.
Privacy on this page
Calculations run in your browser. The values you enter are not sent to the server or saved in browser storage. Reloading the page returns the inputs to their initial state.
To understand how the page is used and to improve the service, this page sends semku’s own usage statistics and automatic error reports. They go only to the dedicated endpoint under semku.com/api/telemetry/v1/. They are not used for advertising or third-party tracking.
The usage statistics include the stage of use (such as starting an operation or requesting a copy), the time it happened and fixed identifiers that distinguish the page and feature. They do not include the values you enter, the results shown or the text you copy. Inputs are not sent as hashes or as size categories either. The full URL and search terms are not sent.
Operations and sessions are distinguished by randomly generated identifiers. In the browser these exist only in temporary memory and are not written to cookies or browser storage. No identification based on cookies or combined device characteristics is used.
Error reports contain the error type, code and time, and, where available, a registered program-source identifier with the line and column number. The error message text and stack traces are not sent. Usage statistics and error reports also carry the site identifier, the published build and a random record identifier. For access records such as IP addresses, browser signals (User-Agent Client Hints), region and language, see the paragraph below.
The feedback form sends the rating you chose and the text you typed in the free-text field when you press the send button. A random ID that distinguishes the submission, the page, site and published build, and the type of request are also sent. There are no fields for your name, email address or phone number, and the values you enter are not attached automatically. Whatever you write in the free-text field is sent as is. Please do not enter personal data, passwords, authentication keys or payment details.
To improve the service, we record the country and state/province-level region at the time of your visit (an estimate based on the connecting network), which site you came from including the page path, and one display-language setting announced by your browser (for example, en-US). Location is kept to country and region only; no city or precise position is recorded. When you use the service, connection records, including your IP address, are automatically generated and retained to maintain service security and identify abnormal access. Cloudflare is the data processor for this site. Collection of this item is enabled only after this notice is published; we do not collect it retrospectively for use before collection is enabled. Query strings such as search terms are not recorded, and neither is the full list of preferred languages or the raw request headers. To identify bots, we may collect and use signals your browser reports about its type and version, along with an indication of whether automation tools are being used. These browser signals are estimates and do not conclusively identify your browser's type or version or whether automation tools are being used. Collection of this information is currently disabled and will only be enabled after this notice is published. We do not collect it retrospectively for use before collection is enabled. The raw User-Agent request header is not recorded. These records are per visit only and use no identifier that links one visit to another. Recording starts only with visits after this notice is published and is not applied retroactively to earlier visits. The region and the referring site have been recorded since 2026-09-20; the display language since 2026-09-24. Browser signals are not recorded yet.
Separately, when you visit the site, the hosting provider records your IP address, the time of the request and user-agent information about your browser and device in Cloudflare Pages’ standard access logs.
For details, see the privacy policy in Korean.
Calculations run in your browser without sending the financial values you enter to the server or storing them. See “Privacy on this page” for information about access data.