How holiday pay works
premium pay = hourly rate × multiplier × holiday hours worked
stacked = premium pay + (hourly rate × 8 hours of holiday pay)
Because no federal law sets holiday premiums, the policy details decide everything. The two big variables: the multiplier (1.5× is most common, 2× at many union shops and hospitals), and whether the paid-holiday benefit stacks on top of the premium or is replaced by it.
A worked example
$20/hour, 8-hour Thanksgiving shift, time and a half: $240. If your employer stacks holiday pay, add the $160 you'd have received for the day off anyway — $400 total, or 2.5× a normal day. The same shift under a "substitute" policy pays $240. Same handbook phrase ("time and a half on holidays"), $160 apart — worth one email to HR to know which you have.
Salaried and exempt employees
Exempt salaried workers generally receive their normal salary regardless of holidays — no premium for working one, no deduction for the office closing. The calculator's annual-value line still applies though: paid holidays are part of total compensation when comparing offers, at about 0.4% of salary per holiday.