Amortization Calculator
Free amortization calculator with a complete payment-by-payment schedule. See principal vs interest on every payment, total interest, extra payment impact, and payoff date.
Example Loans
30-Year Mortgage
$300,000 • 7% • 30 yr
Personal Loan
$20,000 • 10% • 5 yr
Auto Loan
$35,000 • 7.5% • 6 yr
Student Loan
$30,000 • 6% • 10 yr
Loan Details View Results
Amortization Summary
Principal vs Interest by Payment
Payment Inspector
Amortization Schedule
| # | Date | Payment | Interest | Principal | Balance |
|---|
How This Is Calculated
Payments use M = P · r(1+r)ⁿ / ((1+r)ⁿ − 1). Each month, interest = balance × (APR ÷ 12) and principal = payment minus interest (plus any extras).
Everything behind the Amortization Calculator
Formulas, reference charts, and detailed answers — expand any section you need.
Loan Amortization Calculator: Why Early Payments Are Mostly Interest
A loan amortization calculator makes the front-loading visible: interest is charged on the remaining balance, and the balance is highest at the start, so early payments are dominated by interest. On a 30-year mortgage at 7%, the crossover payment where principal finally exceeds interest arrives around year 20, and the schedule marks it exactly for your loan.
| Payment | Interest Portion | Principal Portion | Balance ($300k, 7%, 30yr) |
|---|---|---|---|
| 1 | $1,750 | $246 | $299,754 |
| 60 | $1,676 | $320 | $286,915 |
| 180 | $1,406 | $590 | $240,415 |
| 360 | $12 | $1,984 | $0 |
Amortization Calculator: Your Complete Payment Schedule
This amortization calculator generates the full payment-by-payment schedule for any loan: every payment's interest portion, principal portion, and remaining balance, from the first payment to the last. Enter the loan amount, rate, and term, and the amortization calculator builds the entire table instantly, visible on the page, downloadable as CSV, with no signup gate in front of it.
Example: A $300,000 loan at 7% for 30 years carries a $1,996 monthly payment; the first payment splits $1,750 to interest and $246 to principal, while the final payment is nearly all principal.
Amortization Schedule Calculator: How the Table Is Built
An amortization schedule calculator applies two steps to every row: monthly interest equals the annual rate divided by 12 times the remaining balance, and the principal portion is whatever remains of the fixed payment after that interest. Because the balance falls with each payment, the interest portion shrinks and the principal portion grows, payment by payment, until the loan zeroes out on schedule.
Mortgage Amortization Calculator With Extra Payments
The mortgage amortization calculator with extra payments rebuilds the entire schedule the moment any extra amount is entered, monthly, annual, or one-time, and shows the delta against the original: interest saved, payments eliminated, and the new payoff date. Extra payments early in the schedule save the most because they strike when the balance, and therefore the interest, is highest.
Example: $200 extra monthly on a $300,000 mortgage at 7% saves roughly $116,600 in interest and pays off about 7 years early.
Amortization Calculator for Car and Personal Loans
An amortization calculator works identically on any fixed-rate installment loan; only the scale changes. A 60-month auto loan crosses its principal-interest crossover in the first year rather than year 20, which is why extra payments on short loans save less dramatically than on mortgages. Run any loan's numbers and the schedule shows its own shape.
Amortization Table by Year: Annual Summary View
The amortization table's annual view rolls 12 monthly rows into one: total paid, total interest, total principal, and year-end balance for each year of the loan. It's the format lenders use on statements and the fastest way to see how much interest a given year of the loan costs, and the toggle switches between monthly detail and annual summary on the same schedule.