How do I figure my taxable income?

I hope this question isn't redundant, but I am a recent graduate and how taxes are taken out is way beyond my head. I am filing as single and have 2 deductions, my salary is 36,200. How do I figure out how much is taxable income? Basically I am trying to figure out how much will be coming out of my check due to taxes (a good guesstimate). I already have FICA and benefits already figured out. Thanks for anyone who can help!