Free Time Calculator Online
Add or subtract multiple time durations (HH:MM:SS). Instantly see the total in hours, minutes and seconds, plus conversions to decimal hours and total minutes.
Quick Time Converter
About the Time Calculator
This free online time calculator lets you add or subtract multiple time durations expressed in hours, minutes and seconds (HH:MM:SS). It is ideal for calculating total work hours, summing up video lengths, tracking exercise durations, or any task that involves adding up multiple time intervals.
The quick converter at the bottom instantly converts any value between seconds, minutes, hours and days, making it a handy all-in-one time utility.
How to Use the Time Calculator
Enter Time Values
Type hours, minutes and seconds into each row. Fields accept any positive number — carry-over is handled automatically.
Choose Add or Subtract
In "Add & Subtract" mode, each row has a +/− operator. Use − to subtract a duration.
Add More Rows
Click "+ Add Row" to include additional time entries. Remove any row with the × button.
Click Calculate
The total appears in HH:MM:SS, decimal hours and total minutes.
Frequently Asked Questions
Yes — enter any value and the calculator will carry over automatically. For example, 90 minutes is treated as 1 hour 30 minutes.
If the total is negative (e.g. subtracting more time than you have), the result is shown as a negative duration with a − prefix.
Use the Quick Time Converter at the bottom. Enter the number of hours, select "Hours" as the from unit, and all conversions (seconds, minutes, days) appear instantly.
No hard limit — you can add as many rows as needed. The calculation handles all of them at once.