mortgage calculator
Bymortgage calculator
Where I can find the best mortgage calculator made in Javascript?
just go to google and type this allintitle: javascript mortgage calculator likely to have many mortgage calculators
mortgage calculator

Where can I find a mortgage calculator also estimate property tax?
You can not, because the tax land varies widely, the prices of similar homes, depending on many factors, especially when the house. Many counties have their assessments online, so I might be able to know what taxes are for houses in the area you are looking for.
How to use a mortgage calculator