Loan Amortization Calculator
The loan amortization calculator generates a complete month-by-month schedule showing how each payment is split between principal and interest. Enter loan amount, APR, and term. The schedule shows payment number, payment amount, interest portion, principal portion, and remaining balance for each month. Early payments are mostly interest; later payments are mostly principal.
Amortization schedule
Loan amortization calculator: frequently asked questions
What is an amortization schedule?
An amortization schedule shows the payment breakdown for each month or period, including how much goes to principal and how much to interest, plus the remaining balance.
Why does interest decrease over time?
As the principal balance decreases, the interest charged (calculated on the remaining balance) also decreases. Early payments are mostly interest; later payments are mostly principal.
How is the payment split?
Each month: interest = remaining balance * (annual rate / 12). Principal = payment - interest.
Can I view only certain months?
This calculator shows all months. For large loans or long terms, the schedule can be long, but it provides complete transparency.
What if I pay extra?
See the loan payoff calculator to model the effect of extra payments on total interest and payoff time.
Official sources
- Wikipedia: Amortization Schedule.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.