Time Calculator – Add & Subtract Hours, Minutes & Seconds Online | tolkit.me

The Time Calculator on tolkit.me is a free online tool that helps you add and subtract hours, minutes and seconds, or calculate the duration between two times of day. It’s ideal for tracking work hours, planning schedules, timing events or adding multiple time entries.

Instead of doing time math manually and dealing with carry-overs from seconds to minutes and hours, this online time calculator gives you fast, accurate results in a clean interface.

Time calculations are easy to get wrong, especially when you’re adding multiple time spans or converting between hours, minutes and seconds. A simple mistake can throw off work logs, timesheets, deadlines or schedules.

Using a time calculator helps you:

• ✔️ Add or subtract time accurately (HH:MM:SS)
• ✔️ Find the time difference between two times of day
• ✔️ Sum multiple time entries for timesheets or projects
• ✔️ Convert between hours, minutes and seconds
• ✔️ Avoid manual math errors when working with time

The Time Calculator on tolkit.me is designed for anyone who needs quick and reliable time duration calculations.

• 1
  Choose your mode:
  Select whether you want to add/subtract time or calculate the difference between two times.
• 2
  For adding or subtracting time:
  Enter one or more time values in hours, minutes and seconds. Select add or subtract if your tool supports negative time adjustments, then calculate the total.
• 3
  For time between two times of day:
  Enter a start time and an end time (for example, 09:30:00 to 17:15:30). The calculator shows the exact duration between them in HH:MM:SS format.
• 4
  Adjust values and recalculate:
  Change times as needed to compare different scenarios, such as alternative shift schedules, breaks or event timings.
• 5
  Use results in your workflow:
  Copy or note the final time result for timesheets, invoices, workout tracking, study logs, project planning and more.