Time Duration Calculator – Calculate Time Between Two Times

Same Day Calculation

When both times are on the same day, simply subtract start from end.

Overnight Calculation

When end time is after midnight, add 24 hours to the end time.

Converting to Decimal

For payroll or billing, convert minutes to decimal hours.

12-Hour Format

Convert AM/PM to 24-hour format for calculation.

Example 1: Standard work day

Problem: Calculate duration from 9:00 AM to 5:30 PM

Solution: Convert to 24-hour: 09:00 to 17:30

17:30 - 09:00 = 8 hours 30 minutes

Decimal: 8.5 hours. Total minutes: 510.

Example 2: Night shift

Problem: Calculate duration from 10:00 PM to 6:00 AM (next day)

Solution: Convert to 24-hour: 22:00 to 06:00

End is before start, so add 24 hours: 06:00 + 24:00 = 30:00

30:00 - 22:00 = 8 hours. This is an overnight shift.

Example 3: Meeting duration

Problem: A meeting runs from 2:15 PM to 4:45 PM. How long?

Solution: 14:15 to 16:45

16:45 - 14:15 = 2 hours 30 minutes

Decimal: 2.5 hours. Total minutes: 150.

Example 4: Full day calculation

Problem: How many hours from midnight to 11:59 PM?

Solution: 00:00 to 23:59

23:59 - 00:00 = 23 hours 59 minutes

Just 1 minute short of 24 hours. Total: 1,439 minutes.

Example 5: Payroll calculation

Problem: Employee works 8:30 AM to 12:00 PM, then 1:00 PM to 5:15 PM. Total hours?

Solution: Morning: 08:30 to 12:00 = 3h 30m

Afternoon: 13:00 to 17:15 = 4h 15m

Total: 7h 45m = 7.75 hours for payroll.