Clock Duration Calculator
Ideal for work shifts, events, or travel itineraries—handles overnight schedules and break deductions automatically.
If the end time is earlier than the start, we assume it crosses midnight.
Optional unpaid breaks or downtime.
Raw duration: 8 hours 30 minutes
Break deducted: 0 hours 30 minutes
Net duration: 8 hours 0 minutes (8.00 decimal hours)
480
Total minutes
8.000
Decimal hours
0.3333
Days
How to Use This Calculator
Enter start and end times
Use 24-hour format for clarity. Overnight shifts are supported automatically.
Specify break minutes
Deduct meal breaks or pauses to see net working time.
Record results
Copy net duration into timesheets, invoices, or workout logs.
Formula
Raw Minutes = End Clock − Start Clock (wrap to next day if negative)
Net Minutes = max(Raw Minutes − Break Minutes, 0)
Decimal Hours = Net Minutes ÷ 60
Example: 21:30 → 05:15 with 30-minute break → Raw = 7h 45m → Net = 7h 15m (7.25 hours).
Applications
- Track shift work, freelance gigs, or consulting sessions.
- Compute overtime hours across midnight.
- Log travel durations (depart and arrival times).
- Time creative sessions or workouts with breaks.
Frequently Asked Questions
Does it support seconds?
This version focuses on minute resolution. Convert seconds to fractional minutes if needed.
Can I add multiple shifts?
Run the calculator for each shift and sum the decimal hours using the Adding Hours and Minutes Calculator.
What if net time is negative?
If breaks exceed the raw duration, the calculator clamps net time to zero.
Can I export the result?
Copy the net duration and decimal hours into spreadsheets, payroll apps, or reports.