Assuming single with no dependents and in Utah, here is my calculator. $15*40*52=$31200 pretax.
Your Income Taxes Breakdown
Federal 12.00% $2,059
FICA 7.65% $2,387
State 4.95% $1,516
Local 0.00% $0
Total Income Taxes $5,961
Income After Taxes $25,239
Take-Home Pay $25,239