Loan Interest Calculator — compare monthly payments across repayment types
This calculator lets you compare the monthly payment and total interest for three repayment types: equal payment (amortizing), equal principal, and interest-only with principal at maturity. It is handy when you are weighing a mortgage or personal loan and want to know the real cost before you sign.
How to use
- Enter the loan amount (in units of 10,000 KRW); the exact KRW figure appears just below.
- Type the annual interest rate and the term. Toggle the term between years and months.
- Pick a repayment type, and the results recalculate instantly.
Features & tips
- A summary card shows monthly payment, total interest, and total repayment at a glance.
- Expand the amortization table to see payment, principal, interest, and balance for every installment.
- For equal principal, both the first and last month's payments are shown, so you can gauge the early burden.
- Set the rate to 0 to model an interest-free arrangement.
FAQ
Q. Which repayment type costs the least interest? A. Equal principal usually has the lowest total interest, while interest-only at maturity has the most. Switch between the three to compare.
Q. What currency does it use? A. Input is in units of 10,000 KRW, and all results are shown in Korean won (KRW).
Q. Does it match my actual loan exactly? A. It is a reference estimate and does not account for fees or early-repayment terms.
