7 h 45 min plus 3 h 30 min
11 h 15 min, which is 675 minutes or 11.25 decimal hours.
Time calculator
Works in hours and minutes on a 24-hour clock. In clock mode, a result past midnight is shown with a note about the next or previous day. Time zones and daylight saving changes are not applied.
What do you need
Do you want to
Total time
11 h 15 min
7 h 45 min plus 3 h 30 min. In days that is 0 days and 11 h 15 min.
- Total minutes
- 675
- Decimal hours
- 11.25
- Days and hours
- 0 d 11 h
Adding time when 60 is not 100
Time is the awkward one. Hours and minutes run on 60, so 7:45 plus 3:30 is not 10:75, it is 11:15. Most mistakes come from forgetting to carry the extra 60 minutes.
The tool works in minutes behind the scenes and shows you the answer three ways: hours and minutes, total minutes and decimal hours. The decimal figure matters for payroll, where 7 hours 45 minutes is 7.75 hours, not 7.45. Entering 7.45 into a timesheet would underpay by 18 minutes, which is a common slip.
There are two modes. Adding two durations is for totalling shifts, study sessions, travel legs or video lengths. The clock mode starts from a time of day and adds or subtracts a duration, so you can see that a flight leaving at 22:30 and lasting 3 hours 45 minutes lands at 02:15 the next day.
One limit: clock mode does not know about time zones or daylight saving. For a journey that crosses zones, work out the duration here, then use the time zone converter for the local arrival time.
Sources
What this calculator does not account for
- Time zones and daylight saving changes.
- Unpaid breaks unless you subtract them.
How this is calculated
Formula: Adding and subtracting time
total minutes =hours × 60 + minutes; decimal hours =total minutes ÷ 60What the symbols mean
- total minutesEverything converted to minutes first, so carrying is automatic.
- decimal hoursUseful for timesheets and pay: 7 h 45 min is 7.75 hours.
Good to know
- For clock times, the result wraps at 24 hours and the tool says how many days later or earlier it is.
- To find the date after a number of days, use the date calculator.
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Worked examples
Each example is worked out by the same code as the calculator above.
22:30 plus 3 h 45 min
02:15 the next day.
Embed this calculator
The frame shows the tool only.
<iframe src="/embed/time-calculator" title="Time calculator" width="100%" height="720" style="border:0;max-width:42rem" loading="lazy"></iframe>Questions
How do I add hours and minutes?
Convert both to minutes, add them, and convert back. For example, 7 h 45 min plus 3 h 30 min is 465 + 210 = 675 minutes, or 11 h 15 min.
How do I turn minutes into decimal hours?
Divide by 60. 45 minutes is 0.75 hours, 30 minutes is 0.5 hours and 20 minutes is 0.33 hours.
What time is it after adding 3 hours 45 minutes to 22:30?
02:15 the next day.
Does it handle daylight saving?
No. It works on a plain clock. A night with a clock change is an hour shorter or longer in practice.
Can I subtract a break from a shift?
Yes. Choose Subtract and enter the shift first and the break second.