โฐ Time Duration Calculator
Calculate hours, minutes, and seconds between times
Common Uses
๐ผ Work Hours
Track your daily work time for timesheets
๐ด Sleep Duration
Calculate how much sleep you got
โ๏ธ Flight Duration
Calculate travel time between cities
๐ณ Cooking Time
Time recipes and meal prep
About Time Duration
This calculator finds the exact time difference between any two times. It handles overnight calculations automatically when you check "End time is next day".
The decimal hours format (e.g., 8.5 hours instead of 8:30) is commonly used for billing, timesheets, and payroll calculations.
For work hours, remember to subtract break time. Most full-time jobs are 8 hours with a 30-60 minute unpaid lunch break.
Frequently Asked Questions
How do I calculate hours worked?
Enter your clock-in time as Start and clock-out time as End. Subtract any unpaid break time from the result. Example: 9:00 AM to 5:30 PM = 8.5 hours, minus 30 min lunch = 8 hours worked.
How do I calculate overnight duration?
Check the "End time is next day" box. For example, 11:00 PM to 7:00 AM (next day) = 8 hours. This is useful for night shifts and sleep tracking.
What is decimal time?
Decimal time expresses minutes as a fraction of an hour. 30 minutes = 0.5 hours, 15 minutes = 0.25 hours, 45 minutes = 0.75 hours. It's used for billing and payroll.
How much sleep do I need?
Adults need 7-9 hours per night. Teenagers need 8-10 hours. Children need 9-12 hours. Use this calculator to track if you're getting enough sleep.
How do I calculate flight duration?
Use departure and arrival times. Remember to account for time zones! A flight departing NYC at 6 PM arriving London at 6 AM is 8 hours (not 12), due to the 5-hour time difference.
How do I convert minutes to decimal hours?
Divide minutes by 60. Examples: 15 min = 0.25 hr, 30 min = 0.5 hr, 45 min = 0.75 hr, 20 min = 0.33 hr, 40 min = 0.67 hr.
What's the difference between 8:30 and 8.5 hours?
They're the same! 8:30 means 8 hours and 30 minutes. 8.5 means 8 and a half hours. Both equal 510 minutes or 30,600 seconds.
How do I calculate overtime?
First calculate total hours worked. Overtime is typically hours over 8/day or 40/week. Example: 10 hours worked = 8 regular + 2 overtime hours.