Total Mortgage Interest Calculator
Enter loan amount, annual rate, and term. Get your monthly payment and total interest paid over the life of the loan. Helps compare terms and see the cost of borrowing.
Calculate total interest
Enter values to calculate.
How it works
We use the standard amortization formula. Total interest = (monthly payment × number of payments) − principal. Longer terms mean lower monthly payments but more total interest.
When to use it
Use it to compare 15- vs 30-year mortgages, to see the impact of a lower rate, or to plan how much you will pay in interest over time.
Frequently asked questions
Does this include taxes and insurance?
No. Only principal and interest. Add PITI separately for full housing cost.
What if I pay extra?
Use the mortgage payoff calculator to see the effect of extra payments.