There are several, depending on what is on your tax return. Look at line 16 on the 1040 - this shows several forms that might be used.
Furthermore, in other cases, there may be worksheets, like for Qualifying Dividends and Capital Gains, one which the income tax due is calculated because Qualifying Dividends and Capital Gains are not taxed at the same rate as Ordinary Income.
In short, the magic place to plug in the number and get the answer does not exist, because there are several different calculations, depending on the content of your return.
Once you look at line 16 and don't see any checked boxes, the next thing for you to do is to look in all the worksheets and supporting forms to see if any of them show how the tax is calculated.
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