Before taking a loan, the real question is "how much per month, and how much interest in total?" Enter the amount, rate, term and repayment type to instantly see your monthly payment and total interest.
| Year | Year-end balance |
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Calculates automatically. Equal payment keeps the monthly amount constant; equal principal starts highest and decreases (table shows year-end balance). This is an estimate and excludes prepayment fees, guarantee fees and rate changes.
At a glance
With the defaults (₩100,000,000 at 4% for 30 years, equal payment), the monthly payment is about ₩477,000 and the total interest is about ₩71,800,000 over 30 years — more than ₩70M of interest on a ₩100M loan. That's why rate and term matter so much.
Equal payment vs. equal principal
- Equal payment (원리금균등) — the total monthly amount (principal + interest) stays the same from start to finish. Predictable and the most common choice, though early payments are interest-heavy so principal shrinks slowly.
- Equal principal (원금균등) — you repay the same principal each month while interest falls, so the first month is highest and it decreases. Higher early burden, but less total interest than equal payment.
If you can handle higher early payments, equal principal costs less interest; if you prefer a steady amount, equal payment is fine. Switch the method above to compare total interest.
FAQ
Does a small rate cut really matter?
Yes. On a large, long loan even 0.5%p changes total interest by millions of won — which is why comparing rates and refinancing matter.
What if I prepay a lump sum?
Principal drops, so later interest falls sharply. But early on a prepayment fee may apply — check your terms (not included here).
How about variable rates?
This assumes a fixed rate for the whole term. Variable payments change with market rates, so test several rates to compare scenarios.
What is DSR?
Debt Service Ratio — annual loan repayments as a share of income, used to set your borrowing limit in Korea. Higher monthly payments raise DSR and can lower your limit.
On the same loan, a 0.5%p rate or a 5-year term difference changes total interest a lot. Before you borrow, compare "total interest" across a few combinations.
This is a general-information estimate. Actual payments vary by product, rate type, fees and payment date — confirm exact terms with your lender.
