Time Calculator
Add or subtract hours, minutes, and seconds to calculate elapsed time and time differences.
Hours
Minutes
Seconds
Hours
Minutes
Seconds
How to Use This Calculator
- Choose a mode: Add/Subtract for time arithmetic, Time Difference for duration between clock times, or Convert for unit conversion
- For Add/Subtract: Enter hours, minutes, and seconds for both times, select + or -, then calculate
- For Time Difference: Enter start and end times (calculator handles overnight shifts automatically)
- For Convert: Enter a value and select the unit to convert from
- Results show in multiple formats for easy reference
Formula
Add/Subtract: Time1 ± Time2 | Difference: End Time - Start Time | Convert: Value × Conversion Factor
Frequently Asked Questions
How do I add or subtract time?▼
In Add/Subtract mode, enter two time values (hours, minutes, seconds), choose + or -, and click Calculate. This is useful for adding multiple time periods together or finding the difference between durations.
What is the Time Difference mode for?▼
Time Difference mode calculates the duration between two clock times (e.g., 9:00 AM to 5:30 PM). It automatically handles times that cross midnight, making it perfect for calculating work hours or event durations.
How does the time converter work?▼
The Convert mode lets you convert a time value from one unit to another. Enter a value, select the unit (seconds, minutes, hours, or days), and see the equivalent in all other units instantly.
Can the calculator handle overnight shifts?▼
Yes! In Time Difference mode, if the end time is earlier than the start time, the calculator automatically assumes the end time is on the next day (e.g., 10:00 PM to 6:00 AM = 8 hours).