Time Calculator
To add time durations: add hours, minutes, and seconds separately. If seconds exceed 60, carry to minutes. If minutes exceed 60, carry to hours. For example, 2:45:30 + 1:30:45 = 4:16:15.
Add and subtract time durations. Calculate total time from multiple entries in hours, minutes, and seconds. Convert between time formats.
Enter Time Durations
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Time Conversion Reference
| Unit | Equals |
|---|---|
| 1 minute | 60 seconds |
| 1 hour | 60 minutes = 3,600 seconds |
| 1 day | 24 hours = 1,440 minutes |
| 1 week | 7 days = 168 hours |
| 0.25 hours | 15 minutes |
| 0.5 hours | 30 minutes |
| 0.75 hours | 45 minutes |
| 1.5 hours | 90 minutes |
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How do I add or subtract time?
- To add time, add hours to hours and minutes to minutes separately. If minutes exceed 60, convert excess to hours. Example: 2:45 + 3:30 = 5:75 = 6:15. To subtract, borrow from hours if needed. Example: 5:15 - 2:45 = 4:75 - 2:45 = 2:30.
- How do I convert between time zones?
- Add or subtract the hour difference between zones. EST to PST: subtract 3 hours (EST is ahead). 3:00 PM EST = 12:00 PM PST. Remember that some regions observe daylight saving time, which shifts times by 1 hour seasonally. UTC (Coordinated Universal Time) doesn't change with seasons.
- How do I calculate elapsed time?
- Subtract start time from end time. If crossing midnight, add 24 hours to the end time first. Example: 10:30 PM to 2:15 AM = 14:15 (2:15 + 12:00) - 10:30 = 3:45 elapsed. Our calculator automatically handles times that span midnight.
- How do I convert 24-hour time to 12-hour time?
- For times 00:00-11:59, add AM. For 12:00, use 12:00 PM. For 13:00-23:59, subtract 12 and add PM. Examples: 09:30 = 9:30 AM, 14:45 = 2:45 PM, 00:15 = 12:15 AM, 23:00 = 11:00 PM. Military time and 24-hour format are the same.
- How many hours until a specific time?
- Subtract the current time from your target time. If the target is earlier in the day, add 24 hours (it means tomorrow). From 2:30 PM to 9:00 PM = 6.5 hours. From 2:30 PM to 9:00 AM (next day) = 9:00 + 24:00 - 14:30 = 18.5 hours.