Free online time calculator. Add or subtract hours, minutes, and seconds. Convert time to total hours, minutes, or seconds. Perfect for work hours tracking, project time estimation, and time math.
Enter the hours, minutes, and seconds for Time 1 and Time 2.
Click Add to sum the times or Subtract to find the difference.
See the result in hours:minutes:seconds format plus total conversions.
Q: How does time addition work?
A: Enter both time values and click Add. Seconds carry to minutes (60s = 1m), minutes carry to hours (60m = 1h).
Q: What if the subtraction result is negative?
A: The calculator shows negative time with a minus sign, useful for finding time deficits.
Q: Can I enter decimal hours?
A: Use whole numbers for hours, minutes, and seconds. For decimal hours, multiply by 60 to get minutes.