Financial calculators, done right

Make every money decision with confidence.

SumWize turns big financial questions into clear answers, for people planning their own money, and for the advisors who guide them.

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Monthly mortgage payment

$2,275
principal & interest
Home price$450,000
Down payment20%
Interest rate6.5%
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Every answer, fully shown its work.

Most calculators hand you a number and hope you trust it. SumWize shows the exact formula, the assumptions, and a worked example you can check by hand.

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  • Assumptions stated in plain language on every tool
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Mortgage payment · the math
payment = P × r / ( 1 − (1 + r)^−n ) P = 360,000 · r = 0.0054167 · n = 360 = $2,275.44 principal & interest

Add $450 tax and $125 insurance a month → $2,850 total. Verify it on any calculator.

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Monthly payment
$2,850
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