Time Duration Calculator

Find the duration between a start and end time.

Duration 7 h 45 min

Duration (decimal) 7.75

Formula: duration = end − start (+24 if overnight)

Step-by-step with your numbers:

1. Values used:

2. Start time = 9.5 h (0–24)

3. End time = 17.25 h (0–24)

5. Duration = 7 h 45 min

6. Duration (decimal) = 7.75

Did we solve your problem today?

Find how long between two clock times (handles crossing midnight).

The math behind it

duration = end − start; add 24 hours if it crosses midnight. Enter times as decimals (5:15 PM = 17.25).

9:30 to 17:15 → 7 h 45 min.

Overnight shift?

Handled automatically — a negative result adds 24 h.