What is the total sales tax rate for Texas?

It depends where you live. The Texas state sales and use tax rate is 6.25%, but local taxing jurisdictions (cities, counties, special purpose districts, and transit authorities) may also impose sales and use tax up to 2% for a total maximum combined rate of 8.25%.

See this link to find out what your local tax rate is: http://comptroller.texas.gov/taxinfo/local/

Texas has rates that vary from city to city. You can look up the exact local sales tax rate for the ZIP code in which you live here:

https://www.salestaxhandbook.com/calculator

You can look at a receipt for your town since they usually list the rate at the bottom next to the tax.  If you don't see it, you can get your rate at http://www.sale-tax.com/Texas