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Loan calculator

Calculate your monthly payment and total interest from loan principal, rate, and term (equal payment, equal principal, or balloon). Free.

Loan principal 10,000 KRW

Annual interest rate %

Term months

Repayment method

Equal principal and interest — Equal payments each month (more interest early on). Common for mortgages.
Equal principal — Equal principal each month; interest decreases over time, so payments fall. Lowest total interest.
Lump sum at maturity — Pay interest monthly and repay the full principal at maturity.

What is Loan Interest Calculator?

A tool that takes your loan amount, interest rate, and term and computes your monthly repayment and the total interest paid to the end. Even at the same amount and rate, the monthly burden and total interest differ by repayment method, so it helps to run the numbers before taking a mortgage or credit loan, or when weighing whether to refinance for better terms. You can compare equal-total (amortizing) and equal-principal methods side by side.

How it works

1 Enter the loan principal, annual interest rate (%), and repayment term (months or years).
2 Choose a repayment method, and the monthly payment, total interest, and total repayment are computed for each method.
3 Try different banks' rate and term conditions to compare whether the monthly burden is manageable.

Frequently Asked Questions

What is the difference between equal-total and equal-principal repayment? ⌄

Equal-total repayment keeps the monthly total fixed, making it easy to plan. Equal-principal starts with larger payments that shrink over time and costs less total interest. A fixed monthly amount favors equal-total; saving on total interest with room early on favors equal-principal.

Does it reflect a grace period (interest-only)? ⌄

The default calculation assumes repaying principal and interest together. Different product structures, such as a balloon payment of principal at maturity, may differ from the actual repayment.

Does it include early-repayment fees? ⌄

The default calculation covers only principal and interest. Early-repayment fees vary by bank, product, and remaining term and need separate checking; factor them in when weighing the benefit of refinancing.

Is the amount I enter stored anywhere? ⌄

No. The calculation happens only in your browser, and loan amounts and terms are not transmitted to or stored on a server.