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Loan Payment and Amortization

This calculator shows the monthly payment, total interest, and simple amortization schedule for a loan.

Enter the loan amount, annual interest rate, and term in years. The calculator uses monthly compounding and level payments (the same payment every month).

Understanding loan payments helps you compare car loans, student loans, and small‑business borrowing.
Key idea Monthly payment = the fixed amount that, together with interest, repays the loan over the term. Total interest = all interest paid over the life of the loan.

Step 1 – Enter your numbers

Start with a simple example, then change the rate or years to see how the payment and total interest change.

For example: 500000 for a ¥500,000 loan.
Example: if the loan rate is 3.5%, type 3.5.
Number of years until the loan is fully repaid.

Step 2 – See results

Monthly payment
Total interest paid
Total of payments (principal + interest)

Amortization by year (summary)

Year Starting balance Principal paid Interest paid Ending balance

Example (car or student loan)

Suppose you borrow ¥2,000,000 for 5 years at 3.0% annual interest. The calculator will show the monthly payment and how much interest you pay over the full 5 years.

Key words

Principal
The amount you borrow. Each payment reduces the principal.
Interest
The cost of borrowing, usually shown as an annual percentage rate.
Amortization
A schedule that shows how each payment is split between interest and principal, and how the loan balance falls to zero.