Time Calculator
Add and subtract time values to calculate their sum and difference.
Time Calculator
Add and subtract time values to calculate their sum and difference.
About the time calculator
Hours, minutes, and seconds
Enter two time lengths with separate hours, minutes, and seconds fields. The calculator converts each value to total seconds first, so inputs like 75 minutes are normalized back into HH:MM:SS.
Sum and signed difference
The sum adds Time 1 and Time 2 together. The difference is calculated as Time 1 minus Time 2, so the sign changes with input order; use Swap when you want to reverse the comparison.
Multiply durations and convert seconds
Use Multiply / divide when one duration repeats several times, such as 1 hour 30 minutes × 5 sessions, or when a total duration needs to be split into equal parts. The Seconds converter turns a raw second count such as 5400 into HH:MM:SS, decimal hours, and decimal minutes.
Accumulated list and URL state
Add to list stores the current sum in an accumulated list that can be totaled and edited. The two inputs and list are also mirrored into the page URL so you can reopen the same setup without server storage.
FAQ
Common questions and answers about this topic.
Can minutes or seconds be greater than 60?
Yes — the tool automatically rolls over to the correct HH:MM:SS format. For example, entering 75 minutes equals 1 hour 15 minutes.
Can I enter negative numbers?
No, each field has a minimum value of 0. The difference is calculated as Time 1 minus Time 2, so the result can show a plus or minus sign depending on input order. Use Swap to reverse the order.
Is my data sent to a server?
No. All calculations run entirely in your browser — input values never leave your device. This is part of Paji Toolset's privacy-first design.
What scenarios is this tool suitable for?
Work hours tracking, project time tallies, meeting scheduling, accumulated exercise or study durations, and any other situation that requires adding or subtracting two time lengths.
Can I multiply a duration or convert seconds to HH:MM:SS?
Yes. Switch to Multiply / divide to total repeated sessions or split a total duration into equal parts. Switch to Seconds converter to enter a raw second count and see HH:MM:SS, decimal hours, and decimal minutes immediately.