Transparent inputs
Overtime thresholds, multipliers, roster anchors, weekend patterns, holiday dates, productive hours and reserve assumptions stay visible so the user can match the calculator to the scenario being checked.
Work time, pay and staffing calculators
Clear tools for hours, shifts, pay and workforce planning.
WorkHoursKit brings practical browser-based calculators together in one focused place for employees, shift workers, supervisors, payroll teams and operations managers.
- ✓No sign-up
- ✓Mobile friendly
- ✓Adjustable assumptions
- ✓Browser-based calculations
50work calculators and planning tools
5focused work categories
0accounts required
Each tool is built around one clear task, with visible formulas, examples, limitations and related calculators.
50 tools available
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Time & Attendance
Time & Attendance Tools
Clock times, breaks, durations, timesheets and decimal-hour conversions.
TC
Time Card Calculator
Calculate daily and weekly hours, unpaid breaks, overtime and optional pay.
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CLK
Time Clock Calculator
Find elapsed work time between clock-in and clock-out, including overnight shifts.
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TS
Timesheet Calculator
Total multiple shifts across a weekly or biweekly timesheet.
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BRK
Lunch Break Calculator
Subtract unpaid lunch or rest breaks from a work shift.
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DUR
Time Duration Calculator
Calculate the exact duration between two times or timestamps.
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NGT
Overnight Shift Calculator
Calculate work that starts on one day and ends after midnight.
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SPL
Split Shift Calculator
Add separate work periods from the same day into one total.
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.00
Minutes to Decimal Hours
Convert hours and minutes into payroll-friendly decimal hours.
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H:M
Decimal Hours to Time
Convert decimal hours back into hours and minutes.
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H+M
Hours & Minutes Calculator
Add or subtract multiple hour-and-minute durations.
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Pay & Overtime
Pay & Overtime Tools
Overtime, differentials, salary conversions and gross-pay estimates.
OT
Overtime Calculator
Separate regular and overtime hours with adjustable thresholds and multipliers.
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2X
Double Time Calculator
Estimate double-time hours and pay using an editable multiplier.
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SD
Shift Differential Calculator
Estimate additional pay for night, evening or special-rate hours.
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NS
Night Shift Pay Calculator
Calculate base and premium pay for night-shift hours.
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HOL
Holiday Pay Calculator
Estimate holiday work pay using an adjustable premium rate.
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H→S
Hourly to Salary Calculator
Convert an hourly rate into weekly, monthly and annual estimates.
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S→H
Salary to Hourly Calculator
Convert annual or monthly salary into an estimated hourly rate.
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GP
Gross Pay Calculator
Estimate gross earnings before taxes and deductions.
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RAISE
Pay Raise Calculator
Calculate a new rate or salary after a percentage or fixed increase.
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MPR
Multiple Pay Rates Calculator
Combine regular, night, holiday and overtime hours at different rates.
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Shift Schedules
Shift Schedules Tools
Rotations, work/off patterns, calendars and future shift dates.
SCH
Shift Schedule Generator
Create a repeating custom work/off pattern from a start date.
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4/4
4 On 4 Off Calculator
See future work and rest days for a four-on, four-off rotation.
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223
2-2-3 Shift Calculator
Map a generic 14-day 2-2-3 work/off pattern and estimate scheduled hours.
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DUP
DuPont Schedule Calculator
Generate a DuPont rotation calendar for multiple teams.
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PIT
Pitman Schedule Calculator
Map a fixed day or night Pitman-style 2-2-3 roster.
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PAN
Panama Schedule Calculator
Generate a 28-day Panama-style rotation that alternates day and night 2-2-3 blocks.
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CON
Continental Shift Calculator
Generate a continental rotating shift pattern.
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ROT
Rotating Shift Calendar
Plan morning, evening and night rotations across teams.
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CUST
Custom On/Off Calculator
Create any repeating pattern such as 5 on / 3 off.
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DATE
Am I Working This Date?
Check whether a selected date is a work day or an off day.
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Staffing & Coverage
Staffing & Coverage Tools
Headcount, relief factors, FTE, roster size and coverage gaps.
24/7
24/7 Staffing Calculator
Estimate headcount required to cover positions around the clock.
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RF
Relief Factor Calculator
Account for rest days, leave and other non-working time.
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MIN
Minimum Headcount Calculator
Calculate the minimum people required for posts and shift coverage.
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ROS
Roster Size Calculator
Estimate the team size needed for a complete roster.
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FTE
FTE Calculator
Convert required labor hours into full-time equivalents.
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COV
Shift Coverage Calculator
Compare required staffing with scheduled coverage by shift.
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BC
Break Coverage Calculator
Estimate relief staff needed to cover breaks within the available scheduling window.
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ABS
Absence Coverage Calculator
Calculate replacement hours or staff needed for absences.
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LR
Leave Reserve Calculator
Estimate reserve staffing for annual leave and planned absence.
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GAP
Coverage Gap Calculator
Identify under-covered hours, shifts or positions.
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Workday Planning
Workday Planning Tools
Business days, monthly hours, rest periods and time-zone planning.
BD
Business Days Calculator
Count working days between two dates with editable weekends and holidays.
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±WD
Add/Subtract Workdays
Move forward or backward by a selected number of workdays.
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MON
Monthly Work Hours Calculator
Estimate scheduled work hours for a selected month.
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YR
Annual Work Hours Calculator
Estimate yearly working hours from a regular schedule.
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AVG
Average Weekly Hours Calculator
Calculate average weekly hours across a selected period.
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REST
Rest Between Shifts Calculator
Measure the recovery time between two shifts.
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H/O
Shift Handover Calculator
Estimate weekly or monthly time spent on handovers.
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CALL
On-Call Hours Calculator
Separate active work time from on-call or standby hours.
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TZ
Shift Time Zone Converter
Convert a shift date and time between user-supplied UTC offsets.
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NEXT
Next Shift Date Calculator
Find the next scheduled shift from a repeating pattern.
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How WorkHoursKit is built
Visible assumptions, traceable calculations and clear limits.
WorkHoursKit is more than a directory of links. Each calculator is built around a defined calculation, with adjustable inputs, examples and explanations intended to help a visitor understand what changed the result. Rules that vary by employer or jurisdiction are kept separate from the arithmetic instead of being presented as universal facts.
Testing and error checks
Calculator logic is reviewed with representative expected values, boundary conditions and invalid-input cases. Time, pay, schedule and staffing tools also include checks intended to stop obviously inconsistent inputs from producing a silent result.
Corrections and accountability
WorkHoursKit documents its methodology, editorial standards and correction process. Material errors can be reported with the page URL and non-sensitive test values so the calculation can be reproduced and reviewed.