Loan Interest Calculator

Calculate monthly repayment and total interest based on loan amount, rate, and term.

Loan Amount

원

Annual Rate

Loan Term

개월

Repayment Method

How to Calculate

Repayment method formulas: 1. Equal Principal + Interest: Pay the same amount (principal + interest) every month PMT = P × r × (1+r)^n / ((1+r)^n - 1) 2. Equal Principal: Pay equal principal each month + interest on remaining balance Higher initial burden but lower total interest 3. Bullet Payment: Pay only interest monthly, repay full principal at maturity Lower monthly burden but highest total interest

Example

Loan: ₩100,000,000, Annual rate: 5%, Term: 30 years (360 months) Equal Principal + Interest basis: - Monthly payment: approx. ₩536,822 - Total payment: approx. ₩193,255,920 - Total interest: approx. ₩93,255,920

FAQ

Which repayment method is better?

To minimize total interest, Equal Principal is advantageous. For fixed monthly payments, Equal Principal + Interest is ideal.

Equal Principal

Pay equal principal monthly; interest decreases over time

Equal Principal + Interest

Pay equal total (principal+interest) every month

Bullet Payment

Pay interest only during loan term; repay full principal at maturity

Are early repayment fees included?

This calculator assumes repayment until maturity without early repayment. Early repayment fees vary by loan contract.