30 Year Loan Calculator
The 30-year fixed loan is the most common structure for U.S. mortgages, spreading payments over 360 months to keep them affordable. This calculator shows exactly how much of each payment goes to principal versus interest, and how much interest accumulates over three decades — useful for comparing a 30-year term against a shorter one.
Enter your numbers and select Calculate to see your estimated payment.
How this calculation works
Standard fixed-rate amortization over a 360-month term. See the full amortization schedule below the results for a month-by-month principal and interest breakdown.
Example calculation
A $350,000 loan at 6.75% over 30 years runs about $2,270 per month, with total interest of roughly $467,000 by the end of the term.
Frequently asked questions
Why is total interest so high on a 30-year loan?
Spreading payments over more months lowers each payment, but you pay interest on the balance for much longer, which adds up. A 15 or 20-year term costs more monthly but far less in total interest.
Does this include property tax and insurance?
No — this is a principal-and-interest calculator. For a full monthly housing payment estimate including taxes, insurance, and PMI, use the Home Loan Calculator.
What happens if I make extra payments?
Extra payments reduce your principal faster, which shortens your payoff timeline and cuts total interest. Model that scenario with the Loan Early Payoff Calculator.
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This calculator provides estimates for informational purposes only and is not a loan offer or financial advice. See our Disclaimer.