Shift
A 12-hour shift is not a 40-hour salary.
Three 12s is 36 hours. Four 12s is 48. The offer letter still divides by 2,080. That is how a night shift hides the week.
Kept Hour
12-hour shifts, 3 days
Three 12s look short. They are not 40. They are also not free at the edges: handoff, commute, and the day after. Start from 36 hours in the calculator.
12-hour shifts, 4 days
Four 12s is a 48-hour week before commute. Divide the salary by 48 times the weeks you actually work. Start from 48 hours in the calculator.
Night shift differential
A night differential that does not clear the sleep is not a raise. Put the real hours in, including the hours you cannot sleep. Start from 40 hours in the calculator.
—Kept hour, after tax
—Kept hour after commute is counted as work
—Gross hourly, before tax
—Evening hours already sold (over 40 / week)
—Commute, valued at your kept hour
—Meetings, valued at your kept hour, per year
—Take-home, same tax load
The calculator stays free. The $39 sheet is a human check of the same numbers, not a locked file.
Share link updates as you type:
Nurses, warehouse leads, and plant jobs lose this comparison when they accept the annual number. Put the real shift in. Then compare it with a 40-hour offer before you reply.
A typical nurse week is already on the site. Change the hours if your rotation is worse.