CalcHub
Free Shopping CalculatorAs of 2026
Enter installment information
Total payment amount
원
Installment months
Customer-paid installments
credit card company
My credit score
Applicable interest rate—연
Interest rates automatically change when you change your card company or credit score. Average interest rates by card company as of 2026 are applied.
Calculation result
After selecting the card company and number of months
Please press Calculate.
Total interest borne by the customer
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—
Total payment amount—
Applicable annual interest rate—
Customer-borne interest—
Interest borne by credit card companies—
1st installment payment—
Total payment amount—
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What is credit card installment interest?
Credit card installment interest is a financial cost incurred when paying for a purchase over several months. Annual interest rates vary depending on the card company and your credit score.
Installment Interest Calculation Method (Equal Principal Repayment)
Monthly Principal = Total Amount ÷ Number of Installment Months
Interest per installment = Remaining principal × (Annual interest rate ÷ 12 ÷ 100)
Monthly Payment = Principal + Interest (Decreases every month)
Interest per installment = Remaining principal × (Annual interest rate ÷ 12 ÷ 100)
Monthly Payment = Principal + Interest (Decreases every month)
What is partial interest-free?
Previous N installments → Consumer interest burden
Remaining installments → Card company bears interest (interest-free)
Ex) Payable up to the 4th installment out of 10 months = Pay only the interest for installments 1 through 4
Remaining installments → Card company bears interest (interest-free)
Ex) Payable up to the 4th installment out of 10 months = Pay only the interest for installments 1 through 4
As of 2026, interest rates for interest-bearing installments range from 11 to 211 per annum, depending on the card company and credit score. If possible, please take advantage of interest-free installment promotions.
Frequently Asked Questions
What is the difference between interest-free installments and interest-bearing installments?
With interest-free installments, the credit card company bears the interest, so the consumer pays only the principal. With interest-bearing installments, the consumer bears interest ranging from 12 to 211% per year.
How to reduce installment interest?
The higher your credit score, the lower the interest rate applied. You can reduce your interest burden by taking advantage of interest-free installment promotions or partial interest-free benefits.
What should I do if I don't know my credit score?
If you do not know your credit score, select “Unknown (Apply Average)” to apply the average interest rate of the relevant card company. You can check the actual interest rate in the card company’s app.
When is the installment interest charged?
The monthly bill includes the principal and the interest for that installment. Since it is an equal principal payment method, the payment is highest in the first month and gradually decreases.