Calculate your monthly payment, total interest, and see the real cost of borrowing money.
Interest Rate Comparison
Effective rate (APR)
The effective rate reflects the true annual cost of borrowing. Interest is calculated on the remaining balance, which decreases with each payment. This is the rate that matters for comparing loans.
Flat rate equivalent
A flat rate is calculated on the original borrowing amount for the entire period — it does not decrease as you pay off the balance. This makes flat rates look lower than effective rates, even though the total cost is the same. Flat rates are commonly used for car financing.
Payment Breakdown Over Time
What if you invested the same amount instead?
This calculator provides estimates for educational purposes only. Actual loan terms, fees, and conditions vary by lender. Always review the complete terms with your financial institution before signing any loan agreement. SmartBaht does not provide financial advice.