Loan Calculator

A loan calculator is an essential financial planning tool that helps you understand the true cost of borrowing money. Whether you are taking out a mortgage, car loan, personal loan, or business loan, this calculator shows your monthly payment, total amount paid over the life of the loan, and total interest cost. It supports three common repayment methods: Equal Payment (fixed monthly payments where principal and interest shift over time), Equal Principal (fixed principal portion with decreasing interest), and Bullet (interest-only payments with principal due at maturity). The interactive amortization schedule and charts help you visualize how your loan balance decreases over time.

1. Enter the loan amount and select your currency (KRW or USD). 2. Set the annual interest rate using the slider or input field. 3. Choose the loan term in months or years. 4. Select a repayment method: Equal Payment, Equal Principal, or Bullet. 5. View your monthly payment, total payment, total interest, and visual breakdowns including a pie chart and balance-over-time line chart. 6. Scroll down to see the full month-by-month amortization schedule.

For Equal Payment (fixed installment), the calculator uses the standard annuity formula: PMT = P x r(1+r)^n / ((1+r)^n - 1), where P is principal, r is the monthly interest rate, and n is the number of months. For Equal Principal, each monthly principal portion is P/n, with interest calculated on the remaining balance. For Bullet repayment, only interest is paid monthly, and the entire principal is due in the final month. All calculations run entirely in your browser.