You could try some tax return help sites, these normally have any calculators you could need. If that does not work then I would recommend using an online calculator website.
http://www.westegg.com/inflation/ is a pretty good inflation calculator expect it only goes to 2007 http://projects.exeter.ac.uk/RDavies/arian/current/howmuch.html
There are a lot of IRA calculators available online. Some of the best calculators are www.dinkytown.net/java/RothIRA.html and www.rothiracalculator.org/
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There are many calculators available online. Bankrate.com and Fool.com offer two good calcs.
There are a number of sites that offer a good auto loan payment calculator online. Some of the good ones that were found are on the Bankrate site and the Online Loan Calculator website.
A good free online home morgage calculator is www.freebyte.com/business/mortgage_calculator.html. Another good option is www.mortgagecalculator.org/.
A good calculator to use is one by weight watchers. They not only have a succesful diet plan but they offer the best tools available for you to mee your weight goals. you can buy one at weightwatchers.com
There is a good health rate calculator available on the website for the American Heart association. I would recommend this above any other website. They are dependable, and truthful.
The best online free income tax calculator is available online from the United State Goverment IRS Department. www.irs.gov/individuals/article/0,,id=96196,00.html
The financial calculators that are available online are usually provided by financial institutions, and they are very accurate. Some sites that offer a good financial calculator are bankrate.com, and coolmath.com.
Roth IRA calculator is sure the thing that helps you with this. You could access it online on some websites such as Bank Rate, Calculator and Roth IRA.
ADP has a great online payroll calculator if you can use their services. They will tell you what you earned, what was taken out for taxes and what your estimated net income was.