How to use the time calculator
In Elapsed time mode, enter a start time and an end time and the gap appears at once — in hours and minutes, then broken down into total minutes, seconds and decimal hours. If the end time is earlier in the clock than the start time, the calculator assumes the end falls the next day and adds 24 hours for you. Use Go advanced to add extra full days for a span that runs longer than one day.
In Add / subtract mode, enter hours, minutes and seconds, choose Add or Subtract, and tap Add to list. Each entry joins a running list with a live running total — useful for summing race splits, video clip lengths, or a handful of billable time chunks in one place.
In Time card mode, enter a clock-in time, clock-out time and unpaid break minutes for each day you worked. The calculator totals each day and adds it into a weekly total, shown in hours and minutes and in decimal hours for payroll, with a bar chart showing your week at a glance.
How elapsed time is calculated
The calculator subtracts the start time from the end time. Because clock times don't carry a date, an end time earlier than the start time is treated as falling the next calendar day — for example a 10:00 PM start and a 6:00 AM end is read as an 8-hour overnight shift, not a negative duration.
Converting time to decimal hours
Payroll and invoicing systems usually want decimal hours rather than hours and minutes. The conversion is minutes divided by 60 added to the whole hours — 7 hours 30 minutes becomes 7.5, and 7 hours 45 minutes becomes 7.75. Every result on this page shows both formats side by side.
Time card hours and overtime
Each day's hours are the time between clock-in and clock-out, minus any unpaid break minutes entered. The week-at-a-glance chart shades any day over 8 hours differently so long days stand out immediately, without hunting through a table. Add an hourly rate in Go advanced to see total pay for the hours entered — the calculator doesn't apply an overtime multiplier automatically, since overtime rules vary by employer and jurisdiction.
What you get
| Output | Example |
|---|---|
| Elapsed time | 8 hr 30 min |
| Decimal hours | 8.5 |
| Running total (add/subtract) | 4 hr 15 min from 3 entries |
| Weekly hours (time card) | 38 hr 45 min · 38.75 |
| Weekly pay (advanced) | $775.00 at $20.00/hr |
Common uses
Timing a work shift or exam window, adding up video or podcast clip lengths, totalling a freelance timesheet, checking how long until an appointment, and turning a week of clock-ins into payroll-ready decimal hours. For the gap between two calendar dates instead of two clock times, use the Date Calculator; for a birthdate-to-today age, use the Age Calculator.
Common questions
How do I calculate elapsed time between two clock times?
Enter a start time and an end time in Elapsed time mode. If the end time is earlier than the start time the calculator assumes it falls the next day and adds 24 hours automatically. Tap Go advanced to add extra full days for spans longer than a day.
How do I add or subtract times?
Switch to Add / subtract mode, enter hours, minutes and seconds, choose Add or Subtract, and tap Add to list. Each entry joins a running list with a live running total, so you can keep stacking times instead of doing one calculation at a time.
How does the time card calculator work?
In Time card mode, enter a clock-in time, clock-out time and unpaid break minutes for each day you worked. The calculator totals each day's hours and adds them into a weekly total, shown both as hours and minutes and as decimal hours for payroll.
How do I convert time to decimal hours for payroll?
Any duration is shown in decimal hours automatically — for example 7 hours 30 minutes is 7.5 decimal hours. In Time card mode the weekly total is also shown in decimal hours so it can be entered directly into a payroll or invoicing system.
Does the time card calculator handle overtime?
The week-at-a-glance chart flags any day over 8 hours so long days stand out at a glance. Tap Go advanced and enter an hourly rate to see total pay at that rate for the hours entered; the calculator does not apply a separate overtime multiplier, since overtime rules vary by employer and jurisdiction.