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Hours Calculator

Calculate time duration between two times

Calculate Time Duration

Enter start and end times to calculate hours and minutes between them.

Times should be in 12-hour format (e.g., 11:00 PM). Overnight durations are automatically calculated.

Time Calculation Results

How many hours between 12:00 PM to 9:00 PM?

9 hours

There are 9 hours from 12:00 PM to 9:00 PM

How many minutes between 12:00 PM to 9:00 PM?

540 minutes

There are 540 minutes from 12:00 PM to 9:00 PM

Common Time Calculations

Quickly calculate these common time durations:

11pm to 1am 4pm to 12pm 5pm to 3am 2am to 3pm 7pm to 3pm 11am to 9pm 5pm to 2pm 4am to 12am 7pm to 1pm 6pm to 12am 4pm to 8pm 4pm to 2am 5pm to 2pm 4pm to 10am 6pm to 3am 7am to 9pm 12am to 2pm 6am to 5am 12pm to 9pm 5pm to 2am 10pm to 9pm

How to Calculate Hours Between Two Times

Calculating time duration between two times is simple when you understand the process. Here's how to calculate the hours between 12pm and 9pm:

  1. Convert both times to 24-hour format: 12pm becomes 12:00, 9pm becomes 21:00
  2. Calculate the time difference: 21:00 - 12:00
  3. Account for overnight durations: Both times are on the same day, so no adjustment needed
  4. Convert to hours and minutes: Total minutes: 540 minutes = 9 hours and 0 minutes

Time Calculation Formula

The mathematical formula for calculating time duration is:

Total Minutes = (End Time in Minutes) - (Start Time in Minutes)

If result is negative, add 1440 minutes (24 hours)

Practical Applications

Our hours calculator is useful for:

  • Calculating work hours and overtime
  • Determining school class durations
  • Planning meetings and appointments
  • Tracking time between events
  • Calculating parking or rental durations

Tips for Accurate Time Calculation

  • Always specify AM/PM to avoid confusion
  • For overnight durations, the calculator automatically adds 24 hours
  • Use 12-hour format with colon (e.g., 11:30 PM)
  • Double-check times around midnight (12:00 AM) and noon (12:00 PM)

How to Use the Calculator

  • Enter start time in 12-hour format (e.g., 11:00 PM)
  • Enter end time in same format
  • Click "Calculate Hours" to see results
  • Use common time links for quick calculations
  • Overnight durations are automatically handled
Time Conversion Examples
  • 12:00 AM Midnight
  • 12:00 PM Noon
  • 11:00 PM 23:00
  • 1:00 AM 01:00
  • 3:00 PM 15:00
Did You Know?

The 12-hour time format dates back to ancient Egypt and Mesopotamia where sundials were used to measure time.

Midnight is the transition point between one day and the next - 12:00 AM refers to midnight at the start of the day.

Time Conversion Tools

Frequently Asked Questions About Time Calculation

To calculate hours between two times: 1) Convert both times to 24-hour format, 2) Subtract start time from end time, 3) If the result is negative, add 24 hours, 4) Convert the result to hours and minutes. Our calculator automates this process.

Yes, our calculator automatically detects when the end time is earlier than the start time (indicating an overnight duration) and adds 24 hours to the end time to calculate correctly.

12:00 AM is midnight (the start of the day), while 12:00 PM is noon (midday). This distinction is crucial for accurate time calculations.

Our calculator automatically shows total minutes in addition to hours. You can also multiply hours by 60 and add remaining minutes.

Our calculator currently handles single-day and overnight durations. For multi-day calculations, you would need to add 24 hours for each full day between the times.

There are 12 hours from 12:00 AM to 12:00 PM.

There are 8 hours from 11:00 AM to 7:00 PM.