I found these on the web through different source and I am not sure how much use they will be or the simplest or you to use, but don’t feel obligated to use any services advertised on this website. I will also continue to post any others I encounter.
Simple mortgage calculator from Kim Komando – http://amortizationloancalculator.net/index.php
Realtor.com offers a mortgage calculator – https://www.realtor.com/mortgage/tools/mortgage-calculator/
Various mortgage calculators – http://www.calculators4mortgages.com/
Determination to refinance an existing mortgage – http://www.bills.com/calculator-mortgage/
Zillow.com offers a mortgage calculator – http://www.domania.com/Calculator/default.aspx
Helpful tips and mortgage calculator – http://www.mtgprofessor.com/home.aspx
Lending tree (careful – you may get alot of ads) – http://www.lendingtree.com/mortgage-loans/calculators/loan-payment-calculator/
References to products and services are not a specific endorsement, but the user must perform their due diligence and investigate whether the product or service is right for them. I welcome any or all comments that would help others.