You can use this TurboTax withholding calculator to estimate how much federal tax should be withheld from your pay:
https://turbotax.intuit.com/tax-tools/calculators/w4/
This link provides more information on how to estimate how much you withholding should be:
https://turbotax.intuit.com/tax-tools/tax-tips/General-Tax-Tips/How-to-Estimate-Federal-Withholding/...
