Time Calculator
Add, subtract, or find the difference between two times. Convert hours, minutes, and seconds instantly.
2:15:30
Result (hh:mm:ss)
135.5
Total Minutes
8,130
Total Seconds
2.258
Decimal Hours
Work Hour Totals
| Result in hh:mm:ss | — |
| Total minutes | — |
| Total seconds | — |
| Decimal hours | — |
| Days and hours | — |
Frequently Asked Questions
How do I add two time values together?
Enter both times in hours, minutes, and seconds then select 'Add'. The calculator handles overflow — 75 minutes becomes 1 hour 15 minutes automatically. This is useful for totalling work hours, combining travel durations, or calculating total study time.
How do I find the time between two events?
Select 'Time Between' mode and enter your start and end times. The calculator gives you the exact difference in hours, minutes, and seconds. For overnight differences (e.g. 11 PM to 2 AM), the calculator assumes the end time is on the next day if it is earlier than the start time.
How do I convert hours to minutes?
Multiply hours by 60. For example, 2.5 hours = 2.5 × 60 = 150 minutes. This calculator shows results in both formats automatically.
What is 'adding duration to a clock time' useful for?
This is useful for scheduling. For example, 'my meeting starts at 2:30 PM and lasts 1 hour 45 minutes — when does it end?' Enter 14:30 as start time, add 1:45:00 duration, and the calculator shows 16:15 (4:15 PM).
How many work hours are in a Nigerian standard work week?
The Nigerian Labour Act specifies a maximum of 8 hours per day and 40 hours per week as normal working hours. Overtime must be paid at minimum 1.25× the normal rate. Many private sector workers in Lagos and Abuja exceed 40 hours per week in practice.