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About Mortgage Amortization Calculator Online
This tool generates a complete mortgage amortization schedule. Enter the home price, down payment, loan term, and interest rate, and it shows your monthly principal-and-interest payment, the running balance after each month, and the total interest you'll pay across the life of the loan.
An amortization schedule reveals something most homeowners discover only after years: the first several years of payments go heavily toward interest, with very little reducing the loan balance. Knowing this changes how you think about refinancing decisions, extra principal payments, and selling before your equity catches up.
If you're comparing 15-year and 30-year terms, or weighing whether to put more down, run the numbers here side by side. Small changes to rate or term often have dramatic effects on lifetime interest.
How to use this tool
How to build a mortgage amortization schedule
Loan principal
"Loan principal" is the amount borrowed at closing — purchase price minus any down payment and after any closing costs you rolled in. Currency-agnostic; pick one and be consistent.
Annual rate and term
"Annual interest %" is the nominal annual rate (e.g. 6.5 for 6.5% APR). "Term months" is the schedule length — 360 for a 30-year fixed, 180 for a 15-year, 60 for an auto loan.
Press Run
Result returns monthlyPayment (standard amortization formula), schedulePreview (up to 360 rows of `{month, payment, principal, interest, balance}`), and truncated (true if the term was longer than 360).
Read the schedule
Early payments are interest-heavy; principal share grows over time. Use the schedule to see when you'd hit 20% equity (PMI removal), or to compute total interest = sum of `interest` column.