Time Calculator

Three calculators in one: add or subtract time from a date and time, find the hours between two times (minus a break), and add up a list of hours for a timesheet.

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Hours and minutes vs decimal hours

Time does not add like normal numbers: 7:45 plus 8:30 is 16:15, not 15.75. Payroll systems often want decimal hours, where 15 minutes is 0.25 and 45 minutes is 0.75. To convert, divide the minutes by 60: 7 hours 45 minutes = 7 + 45 ÷ 60 = 7.75 hours. The calculator shows both formats so you can copy whichever your timesheet needs.

Common conversions

Minutes	Decimal hours
6	0.10
15	0.25
20	0.33
30	0.50
40	0.67
45	0.75

Shifts that cross midnight

For a night shift, pick the real dates in "Time between two times": 22:00 on Monday to 06:30 on Tuesday is 8 hours 30 minutes, or 8 hours after a 30-minute break. Using dates avoids the classic mistake of getting a negative number.

What you can type as a duration

2:30 (hours:minutes), 1:02:03 (with seconds), 7.5 (decimal hours), 90m, 45 mins, 3 hrs, 2 hours 30 minutes, 1d 4h. Put a minus in front to subtract a line in the timesheet list.

FAQ

How do I add hours and minutes?

Add the hours and the minutes separately, then turn every 60 minutes into one hour. 7:45 + 8:30 = 15 hours 75 minutes = 16:15. The timesheet box does this for any number of lines.

How many hours is 9 to 5:30?

8 hours 30 minutes, or 8 hours after a 30-minute lunch break.

How do I convert minutes to decimal hours?

Divide the minutes by 60. 45 minutes ÷ 60 = 0.75, so 7:45 is 7.75 hours.

What time will it be in 8 hours?

Put the current time in "Start", type 8:00 as the duration and choose Add. The result includes the date if it passes midnight.

Link to this tool

Found it useful? Put a link in your docs, README or forum answer so others can use it too:

HTML

<a href="https://headsntail.com/tools/time-calculator">Time Calculator</a> (free, by HeadsNTail)

Markdown (GitHub, Stack Overflow, dev.to)

[Time Calculator](https://headsntail.com/tools/time-calculator)

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