Time Duration Calculator
Calculate the total duration between two times. Get the result in hours, minutes, and seconds. Works for same-day and overnight durations.
Part of our Date & Time Calculators collection.
Time Duration Calculator
Free online calculator
Results update automatically as you type
How to Use This Calculator
- 1
Enter the start time.
- 2
Enter the end time.
- 3
See the total duration in hours and minutes.
How Duration is Calculated
Duration = End Time − Start Time Converted to hours and minutes. Overnight durations (end time before start time) automatically add 24 hours.
Example Calculation
Example: 9:00 AM to 5:30 PM
Inputs
startTime: 9:00 AMendTime: 5:30 PM
Result
8 hours 30 minutes
From 9:00 AM to 5:30 PM = 8.5 hours = 8 hours 30 minutes.
Frequently Asked Questions
Does this work for overnight durations?
Yes — if the end time is before the start time, the calculator assumes the end time is the following day.