Quick answer: time and a half is 1.5 x your hourly rate. At 18 an hour it is 27; 8 overtime hours pay 216.
What is time and a half?
Time and a half is 1.5 times your regular hourly rate, the federal minimum for overtime hours over 40 in a workweek. At 18 an hour, time and a half is 27 an hour: 18 + half of 18 (9).
For a whole week with regular and overtime hours, the overtime calculator totals the pay; for holiday premiums at 2x or 2.5x, see double time.
Sources: DOL: Overtime pay. Rules checked . Found a problem? Tell us.
Questions
What is time and a half of 20?
30 an hour (20 x 1.5).
What is time and a half of 15.50?
23.25 an hour (15.50 x 1.5).
Is holiday pay time and a half?
Only if your employer or contract says so. Federal law does not require premium pay for holidays unless the hours push the week over 40.