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Mortgage Payment at 4.5 Percent
This page is built around a 4.5 percent rate on $300,000 over 30 years. It does not claim what lenders charge. Change any box to test your own case.
At 4.5 percent the monthly payment on the starting loan is $1,520.06. Total interest over the term is $247,220.
How the payment is worked out
Here is the formula in plain words. The payment equals the loan times the monthly rate over one minus a discount factor. The discount factor is one divided by one plus the monthly rate, multiplied out 360 times. With 4.5 percent a year the monthly rate is 0.375 percent. The loan here is $300,000.
Worked example
At 4.5 percent a $300,000 loan over 30 years costs $1,520.06 a month. The first month includes $1,125.00 of interest.
A rate one point higher, 5.5 percent, would cost $1,703.37 a month. A rate one point lower, 3.5 percent, would cost $1,347.13.
Questions about this calculator
What would one point less than 4.5 percent save?
Moving to 3.5 percent lowers the payment by $172.92 a month and saves $62,252 of interest.
Would an extra $100 a month help at 4.5 percent?
It would end the loan 3 years 7 months sooner and save $34,087 of interest on the example loan.
How does a half point change the payment on $300,000 at 4.5 percent?
A half point higher raises the payment to $1,610.46. A half point lower reduces it to $1,432.25.
Is a lower rate than 4.5 percent always better?
Not if it comes with fees or points. A rate one point lower saves $172.92 a month here. Divide the upfront cost by that saving to see how many months it takes to break even.
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This page is for education only and is not financial or tax advice.