Nice. Travis County has a nice pdf child support calculator. It has the %. Here is the link: http://www.co.travis.tx.us/records_communication/law_library/pdfs/calculator.pdf
I offer free consultations and am quite familiar with Harris County family judges.
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The Texas Family Code is available on-line. Go to any major search engine and look it up.
Under Section 154 is child support. There is a chart to determine the percentage depending on how many children are before that court & how many children total you support.