Time Calculator
Free online time calculator. Add or subtract hours, minutes, and seconds, or sum multiple time entries for a total duration.
How to Use the Time Calculator
Switch between Add/Subtract and Sum Multiple modes. In Add/Subtract mode, enter a start time, then the hours, minutes, and seconds to add or subtract. In Sum Multiple mode, add time entries one by one and the tool calculates a running total.
About This Tool
Add or subtract time values, or sum multiple time entries for a total. Useful for tracking accumulated work time, combining video durations, or calculating total cooking time. Works with the Hours Calculator for shift tracking and the Time Duration Calculator for date-and-time spans.
Frequently Asked Questions
Does this handle times crossing midnight?
Yes. If the result crosses midnight, the time wraps correctly and a day indicator shows whether the result falls on the next or previous day.
What format should I enter time in?
Use the time input fields which accept hours, minutes, and seconds. The tool handles the conversion and overflow automatically.
Can I sum more than two time entries?
Yes. The Sum Multiple mode lets you add as many time entries as you need. The running total updates as you add each entry.