Hours between Two Times Calculator
Calculate the duration between any two times with precision down to seconds
Calculate Hours Between Times
Start Time
Start Time: 09:00
End Time
End Time: 17:00
Time Duration
Calculation Method: End time - Start time
Formula: Convert to seconds, subtract, then convert back to hours/minutes/seconds
Times (24h format): 09:00 → 17:00
Example Calculations
Standard Work Day: 9:00 AM to 5:00 PM
Start Time: 09:00 (9:00 AM)
End Time: 17:00 (5:00 PM)
Calculation: 17:00 - 09:00 = 8 hours
Result: 8 hours exactly
Night Shift: 10:30 PM to 6:15 AM
Start Time: 22:30 (10:30 PM)
End Time: 06:15 (6:15 AM next day)
Calculation: (24:00 - 22:30) + 06:15 = 1:30 + 6:15 = 7:45
Result: 7 hours and 45 minutes
Quick Presets
Time Conversion Guide
Tip: To convert decimal hours to minutes, multiply the decimal part by 60.
How to Calculate Hours Between Two Times
Step-by-Step Method
- 1.Convert both times to 24-hour format if using 12-hour format
- 2.Convert each time to total seconds: hours × 3600 + minutes × 60 + seconds
- 3.Subtract start time from end time in seconds
- 4.If result is negative, add 24 hours (86,400 seconds) for next-day calculation
- 5.Convert result back to hours, minutes, and seconds
Common Use Cases
- •Work shift duration and overtime calculation
- •Meeting and event duration planning
- •Travel time and schedule coordination
- •Timesheet and payroll calculations
Calculation Examples
Example 1: Same Day
Start: 9:00 AM (09:00) = 9 × 3600 = 32,400 seconds
End: 5:00 PM (17:00) = 17 × 3600 = 61,200 seconds
Difference: 61,200 - 32,400 = 28,800 seconds
Result: 28,800 ÷ 3600 = 8 hours
Example 2: Overnight
Start: 10:30 PM (22:30) = 81,000 seconds
End: 6:15 AM (06:15) = 22,500 seconds
Difference: 22,500 - 81,000 = -58,500 seconds
Add 24h: -58,500 + 86,400 = 27,900 seconds
Result: 27,900 ÷ 3600 = 7.75 hours (7h 45m)
Note: When the end time appears earlier than the start time, the calculator assumes the end time is on the following day.
Time Format Conversions
12-Hour to 24-Hour
- • 12:00 AM = 00:00 (midnight)
- • 1:00 AM = 01:00
- • 12:00 PM = 12:00 (noon)
- • 1:00 PM = 13:00
- • 11:59 PM = 23:59
Decimal Hours
- • 8.5 hours = 8 hours 30 minutes
- • 7.75 hours = 7 hours 45 minutes
- • 0.25 hours = 15 minutes
- • 0.5 hours = 30 minutes
- • 1.333 hours ≈ 1 hour 20 minutes