Free Time, Hours & Date Calculators
Straightforward tools for the maths that comes up at work: shift and timesheet totals, overtime, break deductions, durations between two clock times, days between dates and conversions to decimal hours. No accounts, no downloads.
Browse by category
- Work & Hours — work hours, time card, timesheet, shift, overtime and lunch break calculators.
- Time — time duration, hours, and add-time calculators.
- Dates — days between dates, business days, and date add or subtract.
- Conversions — decimal hours, minutes to hours, and seconds conversions.
Available now
- Work Hours Calculator — live. Calculate hours worked between start and finish times, subtract unpaid breaks and total multiple shifts — with overnight support and decimal hours.
- Time Card Calculator — live. Weekly Monday–Sunday time card with clock-in/out, unpaid breaks, overnight shifts, regular vs overtime hours and estimated pay.
- Timesheet Calculator — live. Enter hours worked each day to total weekly or biweekly timesheets in hours, minutes and decimal hours, with optional per-week overtime.
- Shift Calculator — live. Calculate hours worked for one or more shifts from shift start and end times, with unpaid breaks, overnight support, decimal hours and optional shift pay.
- Overtime Calculator — live. Calculate regular hours, overtime hours and estimated overtime pay from your total hours, hourly rate and overtime multiplier.
- Lunch Break Calculator — live. Calculate lunch break duration, your return-to-work time, or actual hours worked after an unpaid lunch — with overnight and AM/PM support.
- Time Duration Calculator — live. Calculate the hours and minutes between two times, including overnight spans, total minutes and decimal hours — plus add or subtract time from a starting time.
- Hours Calculator — live. Add, subtract and total hours and minutes. Enter durations as hours + minutes or H:MM values, with automatic minute carrying and decimal hours.
- Add Time Calculator — live. Add or subtract hours and minutes from any starting time and instantly find the resulting clock time, with overnight wrapping, multi-day durations and clear day-change labels.
- Days Between Dates Calculator — live. Count the number of days, weeks and calendar time between two dates, with an optional include-end-date count, hours and minutes, and a calendar difference of years, months and days.
- Business Days Calculator — live. Count working days between two dates, excluding weekends and your own holiday dates, or add and subtract business days to find a future or previous working date.
- Date Add & Subtract Calculator — live. Add or subtract days, weeks, months or years from any starting date to find the resulting calendar date, with true calendar arithmetic and month-end clamping.
- Age Calculator — live. Calculate exact age in years, months and days from a date of birth or any start date, with total months, weeks and days and true calendar arithmetic.
- Decimal Hours Calculator — live. Convert hours and minutes to decimal hours, or convert decimal hours back to hours and minutes — with a quick reference table for common payroll conversions.
- Time Conversion Calculator — live. Convert between seconds, minutes, hours and days with a single value and unit selector — instant results with equivalent values in all four units.
- Minutes to Hours Calculator — live. Convert any minute total into hours and minutes or decimal hours — instant results with a quick reference table for common payroll conversions.
Guides
- How to Calculate Work Hours Correctly — the formula for hours worked, paid vs unpaid breaks, overnight shifts and decimal hours.
- Decimal Hours Explained — how to convert minutes to decimal hours and why 7:30 is not 7.30.
- Counting Business Days — inclusive vs exclusive counting, weekends, holidays and common mistakes.
- How to Calculate Your Lunch Return Time — work out what time you return from a 30, 45 or 60 minute lunch, with examples.
- Time & Decimal Hours Reference — a printable minutes-to-decimal-hours table (1–60 min), common workday lengths, break deductions and rounding rules.
- Timesheet Hours & Payroll Calculations Explained — start/end times, breaks, decimal hours, weekly totals, overtime and rounding with worked examples.
- Overtime Hours Explained — regular vs overtime hours, thresholds, multipliers and worked pay calculations.