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Free Elapsed Time Calculator

24-hour format (HH:MM)

24-hour format (HH:MM)

Enter start and end times, then click Calculate

What Is Time Duration?

Duration, or elapsed time, measures the amount of time that passes from the beginning to the end of an event. For example, if a meeting runs from 2 PM to 4:30 PM, the elapsed duration is 2 hours and 30 minutes. This free online time duration calculator instantly computes such intervals, helping you solve word problems and plan schedules efficiently.

How to Use This Free Time Duration Calculator

The calculator adapts to three common situations, depending on which values you already have. Enter times in 24-hour format (e.g., 14:00 for 2 PM) for accurate results.

Find the End Time When You Know the Start and Duration

  • Enter the start time in the Start field.
  • Enter the event duration (hours and minutes) in the Duration field.
  • The tool calculates the finish time automatically.

Find the Start Time When You Know the End and Duration

  • Enter the end time in the End field.
  • Enter the event duration.
  • The calculator works backward to show the starting time.

Calculate Hours Between Two Times

  • Enter both the start and end clock times.
  • The time difference calculator displays the interval between them.
  • If the end time is earlier than the start time (e.g., overnight), the tool correctly handles the rollover.

Practical Examples of Elapsed Time Calculation

  • Work shift tracking: A shift starts at 9 AM and ends at 5 PM; the duration is 8 hours.
  • Travel planning: A flight departs at 10:20 AM and arrives at 1:45 PM; the elapsed time is 3 hours 25 minutes.
  • Overnight events: A party starts at 11 PM and ends at 3 AM the next day; the tool accounts for the date change and returns 4 hours.

Why Use This Online Time Duration Calculator?

  • Free and instant – no sign‑up required.
  • Supports both AM/PM and 24‑hour input – the converter handles the conversion for you.
  • Accurate for any interval – minutes, hours, or cross‑midnight events work without manual subtraction.
  • Ideal for students solving elapsed time word problems, professionals tracking billable hours, or anyone wanting to quickly find the time gap between two moments.

FAQ

1. How do I calculate the elapsed time between two times?

Enter the start and end times in 24-hour format (the calculator also accepts AM/PM) into the corresponding fields. The tool subtracts the start time from the end time and displays the duration. If the minutes in the subtraction are negative, it automatically borrows one hour (60 minutes) to produce a valid result.

2. Can this free time duration calculator handle overnight intervals?

Yes. When the end time is earlier than the start time (e.g., 11 PM to 3 AM), the calculator recognizes that the event crosses midnight and correctly adds the appropriate number of hours to compute the total elapsed time.

3. What is the formula for elapsed time?

Elapsed time equals the difference between the end time and the start time: \( \text{duration} = \text{end} - \text{start} \). When subtracting, if the minutes are insufficient, convert one hour to 60 minutes and adjust the hour accordingly.

How to Use

  1. Enter the start time in 24-hour HH:MM format (e.g., 09:00 for 9 AM).
  2. Enter the end time in 24-hour HH:MM format (e.g., 17:30 for 5:30 PM).
  3. Click Calculate to see the elapsed time in hours, minutes, and seconds.