Loan Amortization Calculator
Enter your loan amount, interest rate, term, and a payment number to see that payment’s interest/principal split and the loan’s total interest.
Loan Amortization Calculator
See how much of a specific loan payment goes to interest versus principal.
Every fixed-rate loan payment is split between interest (charged on the remaining balance) and principal (which reduces what you owe). Early payments are mostly interest; later payments are mostly principal. This calculator estimates that split for any payment number you choose.
Example
- With the default values shown above, this calculator returns: Monthly Payment ≈ USD 1,580.17; Balance Before This Payment ≈ USD 250,000.00; Interest Portion of This Payment ≈ USD 1,354.17; Principal Portion of This Payment ≈ USD 226.00; Total Interest Over Full Loan ≈ USD 318,861.22.
Frequently Asked Questions
Why is more of my early payments interest?
Interest is charged on your current balance, which is highest at the start of the loan — as the balance shrinks with each payment, less of your fixed payment goes to interest and more goes to principal.
What is amortization?
Amortization is the process of paying off a loan through regular, fixed payments over time, structured so the loan balance reaches exactly zero at the end of the term.