Time Duration Calculator
Ideal for timesheets and productivity tracking—input start/end times, subtract breaks, and view net duration instantly.
Sum all unpaid breaks or interruptions (e.g., lunch, errands).
How to Use This Calculator
Enter start and end timestamps
Use the datetime pickers to capture work periods, study sessions, or exercise blocks.
Subtract breaks
Add up lunch, coffee breaks, or interruptions and enter total minutes to deduct.
Review net duration
Use net time for billing, timesheets, or scheduling future sessions.
Formula
Raw Minutes = (End − Start) ÷ 60,000
Net Minutes = Raw Minutes − Break Minutes
Net Hours = Net Minutes ÷ 60
Example: 08:30 − 17:15 with 45 min break → raw 525 min → net = 480 minutes (8 hours).
Why Track Duration?
- Submit accurate timesheets by subtracting unpaid breaks.
- Monitor focused study or deep-work sessions.
- Evaluate workout or meditation streaks.
- Calculate billable hours for freelancers and consultants.
Frequently Asked Questions
Can I span multiple days?
Yes—the pickers handle dates. Overnight shifts and multi-day retreats work automatically.
What if breaks exceed the session?
The net duration becomes negative, indicating more break than work. Adjust inputs as needed.
Does this handle seconds?
Seconds are captured when you pick times with seconds or type manually; the output rounds accordingly.
How do I convert net time to decimal hours?
The calculator provides decimal hours automatically—perfect for payroll or spreadsheets.