One page for work-time planning: build a rotating 12-hour shift pattern from D/N/O letters, price night and weekend differentials, run weekly overtime pay, project PTO accrual, count the vacation days a trip costs, count work days until a deadline, estimate the days until retirement, convert weekly hours to FTE and annual hours, prorate salary for a partial period, deduct unpaid breaks, plan a meeting across three time zones, track work anniversaries, count weekend days, and net out holidays from the 260-day work year.
Free toolNo signupFormula shown
Saved & recent
CHECK ENTRYSAVED
RESULT
—
FORMULA USEDWork Schedule Calculator
One dropdown, every work-time question
Pick the question from the dropdown and the form adapts: four fields for a rotating shift pattern, five for a shift-differential week, two for a work anniversary. Every member shows a detail table or rows beneath the board plus a substituted formula line, so you can check the arithmetic against your own payroll stub.
The conventions, stated plainly
Overtime is weekly: hours beyond the regular bucket are paid at rate × multiplier (1.5 = time and a half). Shift differential buckets a 40-hour week into day, night, and weekend hours — night hours get the night premium, weekend hours the weekend premium, and the rest the base rate; the buckets do not stack. Prorated salary counts both endpoint days as paid (Jan 1 – Jun 30, 2026 = 181 days) over a 365-day basis, or 366 only when a February 29 falls inside the span. Retirement assumes you finish work on December 31 of the year you reach the age, since only the birth year is collected. All date math runs at UTC midnight, so every "day" is exactly 24 hours.
Worked example
Weekly overtime: 40 regular + 10 overtime hours at $20/hour.
Overtime pay 10 × $30 = $300, so the weekly total is $1,100.
Or switch to PTO accrual: 4 h × 26 paychecks × 2 years = 208 hours banked.
How to use it
Pick the work question from the dropdown.
Fill the fields that appear — dates are YYYY-MM-DD, clock times HH:MM, offsets like -5 or 9.
Read the big result, the detail rows (or the shift/meeting table), and the formula line.
Load a preset to see a worked example, then copy, print, or share the link.
Frequently asked questions
How is weekly overtime pay calculated?
Hours beyond your regular bucket are paid at hourly rate × multiplier — 1.5 for time and a half, 2 for double time. The example: 40 + 10 hours at $20 with a 1.5 multiplier gives $800 regular + 10 × $30 = $1,100 for the week. This is the weekly (FLSA-style) rule; some states add daily-overtime rules this member does not apply.
How does the rotating shift-pattern member work?
Type your rotation as one letter per day — D for a 12-hour day shift, N for a night, O for off — and give the cycle length and a day-1 date. The tool lists the next shifts in a table, and reports hours per cycle and average hours per week (a DDNNOO rotation averages 56 h/week, which is why 12-hour rotations feel heavy).
Which day-count does the prorated-salary member use?
Both the first and last day count as paid days, and the basis is the actual length of that year: January 1 to June 30, 2026 is 181 paid days over 365, so a $60,000 salary prorates to 60,000 × 181/365 = $29,753.42. The basis becomes 366 only when a February 29 falls inside the span itself.
Do night and weekend differentials stack?
Not in this tool — each hour lands in exactly one bucket: night hours get the night premium, weekend hours the weekend premium, and the remaining weekday day-shift hours get the base rate. If your employer pays a combined weekend-night rate, price those hours in the weekend bucket using the combined percentage.
Are the time-zone offsets affected by daylight saving?
No — you type fixed UTC offsets, and the planner converts your clock time to each zone with day rollovers marked. During daylight-saving months, observing zones shift +1 hour, so re-enter the offsets then: New York is UTC−5 on standard time but UTC−4 in summer, while Tokyo stays UTC+9 year-round.
What FTE is 30 hours a week?
0.75 — weekly hours divided by the full-time week (30 ÷ 40). The rows also show it as a percentage (75%) and as annual hours (1,560 of the 2,080-hour standard year). If your employer defines full-time as 36 or 38 hours, change the denominator field and everything follows.