Use this free online time calculator to add or subtract two time durations given in hours, minutes, and seconds. It's perfect for combining work periods, cooking times, or workout intervals into one accurate total.
How to Use the Time Calculator
- Enter the First Duration in hours, minutes, and seconds.
- Choose Add or Subtract from the Operation dropdown.
- Enter the Second Duration in hours, minutes, and seconds.
- Click "Calculate" to see the combined result in hours, minutes, and seconds.
- Use "Clear" to reset both durations and start over.
Frequently Asked Questions
The calculator shows the absolute value of the difference along with a note, "(negative duration: second time is longer)", so you know the second duration was actually longer than the first.
Yes. Any field left blank is treated as zero, so you can calculate with just hours, just minutes, or any combination you need.
Minutes and seconds fields accept values from 0 to 59 each, matching standard time notation, while the hours field has no upper limit.
Yes, it's completely free with no sign-up required.