Duration Calculator
Calculate time intervals with the free Duration Calculator. Enter the time values required by the tool to determine a total duration in supported units such as seconds, minutes and hours. Use it for work sessions, project estimates, event planning and application development. Check whether your inputs represent elapsed time or clock times to ensure the result matches your intended calculation.
Total: 5,400 seconds · 90 minutes · 1.5 hours · 0.0625 days. Minutes and seconds above 59 are carried over, so 90 minutes becomes 1 hour 30 minutes.
What is Duration Calculator?
Calculate time intervals with the free Duration Calculator. Enter the required time values to determine the total duration in supported units such as seconds, minutes and hours. Use it for work sessions, project estimates, event schedules and software development tasks. Check whether your inputs represent elapsed time or clock times, particularly when the interval crosses midnight.
Why use this tool?
- Enter any mix of hours, minutes and seconds, even values above 59.
- See the result as hours, minutes and seconds, as HH:MM:SS, and as separate totals.
- Convert minutes to hours or seconds to minutes by entering one field.
How to use Duration Calculator
- Step 1. Enter the hours, minutes and seconds.
- Step 2. Read the formatted duration and the totals underneath.
- Step 3. Change any field to update the result immediately.
Common use cases
Important notes
- Minutes and seconds above 59 are carried over, so 90 minutes becomes 1 hour 30 minutes.
- This tool adds time values. It does not find the difference between two clock times.
- Decimal values are allowed. The formatted result is rounded to whole seconds.
More Time Tools
Duration Calculator FAQ
How many seconds are in 1 hour 30 minutes?
There are 5,400 seconds. That is 3,600 for the hour plus 1,800 for the 30 minutes.
How do I convert minutes to hours?
Enter the minutes and read the hours total. For example, 90 minutes is 1.5 hours.
How do I convert seconds to hours and minutes?
Enter the seconds and read the formatted duration. For example, 3,725 seconds is 1 hour 2 minutes 5 seconds.
Can it find the time between two times?
No. It adds a duration from the values you enter. To find the gap between two clock times, subtract the earlier time from the later one first.