How to Use a Mortgage Calculator to Estimate Your Monthly Payment
A step-by-step walkthrough of using a mortgage calculator: principal, interest rate, term, taxes and insurance — with worked examples.
A mortgage calculator turns four numbers — loan amount, interest rate, term, and down payment — into an estimated monthly payment. Understanding how each input moves the result helps you compare loan offers with confidence.
The four inputs that matter most
Principal is the amount you borrow. Rate is the annual interest, expressed as a percentage. Term is the number of years to pay it back. Down payment reduces the principal directly.
Worked example: a $350,000 home
With 20% down, a 30-year fixed at 6.5% comes to roughly $1,770 in principal and interest per month. Add taxes and insurance for the true monthly cost.
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