Add / Subtract Time
Time Duration Between
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Key Features
Everything you need, right at your fingertips. Simple, fast, and built for everyone.
Add & Subtract Time
Add or subtract hours, minutes, and seconds effortlessly.
Duration Between
Calculate the exact time difference between two times.
Multiple Formats
Results shown in HH:MM:SS, total minutes, and total seconds.
Easy to Copy
Click to copy the result for use elsewhere.
How to Use This Time Calculator
Getting started is easy. Just follow these simple steps.
Choose Operation
Add time, subtract time, or find duration between two times.
Enter Values
Type hours, minutes, and seconds for each time.
See Result
The answer appears instantly in multiple formats.
Copy & Use
Grab the total duration or formatted time string.
About This Time Calculator
Time calculations are used constantly in everyday life —from figuring out work hours and payroll to planning schedules and tracking elapsed time. Despite time being something we deal with every day, time math can be tricky because of the non-decimal nature of hours, minutes, and seconds.
Adding or subtracting time works differently from regular arithmetic because there are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day. This base-60 (sexagesimal) system comes from ancient Babylonian mathematics and has been used for time and angle measurements for thousands of years.
Common time calculations include adding or subtracting hours, minutes, and seconds; calculating the duration between two times of day; converting between units (seconds to minutes, hours to days, etc.); and computing total time worked for payroll or time tracking purposes.
A clock time written as 1730 is 5:30 PM. Convert it with the military time converter, then enter the clock time here.
A time calculator handles all the complexity of time math automatically. It eliminates the common errors that happen with manual calculation, especially when dealing with times that cross midnight or involve large durations.
Multiply minutes
20 minutes times 20 is 400 minutes, or 6 hours 40 minutes. 45 minutes times 2 is 90 minutes, or 1 hour 30 minutes. 45 minutes times 9 is 405 minutes, or 6 hours 45 minutes. 30 minutes plus 45 minutes is 1 hour 15 minutes.
| Minutes | Times | Result |
|---|---|---|
| 20 minutes | 20 | 400 minutes = 6 hours 40 minutes |
| 45 minutes | 2 | 90 minutes = 1 hour 30 minutes |
| 45 minutes | 9 | 405 minutes = 6 hours 45 minutes |
| 30 + 45 minutes | add | 75 minutes = 1 hour 15 minutes |
Clock times
30 minutes after 10:47 is 11:17. 30 minutes from 10:50 is 11:20. 18:30 is 6:30 p.m.
| Start | Add | Result |
|---|---|---|
| 10:47 | 30 minutes | 11:17 |
| 10:50 | 30 minutes | 11:20 |
| 18:30 | — | 6:30 p.m. |
Add minutes and seconds
45 seconds plus 30 seconds is 75 seconds, or 1 minute 15 seconds. 2 minutes 40 seconds plus 1 minute 50 seconds is 4 minutes 30 seconds. When the seconds pass 60, carry 1 minute.
| Start | Add | Result |
|---|---|---|
| 45 seconds | 30 seconds | 1 minute 15 seconds |
| 2 minutes 40 seconds | 1 minute 50 seconds | 4 minutes 30 seconds |
Frequently Asked Questions
How do you calculate time difference?
Subtract the start time from the end time. If minutes go negative, borrow 60 minutes from the hour. When crossing midnight, add 24 hours to the end time before subtracting.
How do I calculate elapsed time?
Elapsed time is the duration between a start and end time. Enter both times and the calculator shows the hours and minutes between them.
How do I add hours and minutes?
Press Add, then enter hours, minutes, and seconds. Minutes past 60 carry into the next hour. 2 hours 45 minutes plus 1 hour 30 minutes is 4 hours 15 minutes.
What is 20 minutes times 20?
20 minutes times 20 is 400 minutes, which is 6 hours 40 minutes.
What is 45 minutes times 2?
45 minutes times 2 is 90 minutes, which is 1 hour 30 minutes.
How do you add minutes?
45 minutes plus 20 minutes is 65 minutes, which is 1 hour 5 minutes. 30 minutes plus 45 minutes is 1 hour 15 minutes.
What is 45 minutes times 9?
45 minutes times 9 is 405 minutes, which is 6 hours 45 minutes.
What is 30 minutes after 10:47?
30 minutes after 10:47 is 11:17. 30 minutes from 10:50 is 11:20. 18:30 is 6:30 p.m.
How do you add minutes and seconds?
45 seconds plus 30 seconds is 1 minute 15 seconds. 2 minutes 40 seconds plus 1 minute 50 seconds is 4 minutes 30 seconds. Seconds past 60 carry into the next minute.
Can this calculator subtract time?
Yes. Press Subtract and enter the two times. The result is the difference in hours, minutes, and seconds.
Does it work across midnight?
Yes. A later clock time on the next day is handled as a duration, so 22:30 to 02:15 is 3 hours 45 minutes.