Time Calculator

Calculators:

These time calculation tools are designed to help you work with hours and minutes for various purposes: you can add or subtract time, as well as calculate the difference between two time points. They are useful for planning your daily schedule, creating timetables, tracking work hours, or managing tasks. To get started, choose the tool you need and enter your values.

Adding and Subtracting Hours and Minutes

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Result:

hh : mm

00 : 00

0 hours
0 minutes

This calculator allows you to add and subtract hours and minutes. It's useful for determining event end times, calculating task durations, planning schedules, and more. Simply enter the required values in the fields provided. Each time entry has an operation symbol in front of it — click it to switch between plus and minus. Once you're done, click "Calculate" and the result will be displayed.

Time Difference Between Two Time Points

Start Time
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End Time
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Result: 00:00

Start Time
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End Time
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Result: 00:00

This tool is designed to calculate the time difference between two points in hours and minutes. Simply enter the start and end times, select your preferred format, and the calculator will show the duration between them.

How to Use the Calculators

Adding and Subtracting Hours and Minutes

  • Entering Values: Enter the desired number of hours and minutes into the appropriate fields. Values from 0 to 999 are supported.
  • Input via dropdown menu or manually: You can input values using the dropdown menu or by typing the numbers manually.
  • Select Operation: Select the "+" sign to add time or the "-" sign to subtract it. Click the sign to toggle between operations.
  • Automatic Minute Conversion: If the "minutes" field contains a value greater than 60, it will automatically convert into hours and remaining minutes in the final result.
  • Add Rows: Use the "Add Rows" button to include additional time entries, allowing you to calculate a total for multiple time periods.
  • Clear and Move Result: The "Clear and Move Result to First Row" button resets all rows while keeping the total result in the first row for new calculations.
  • Clear All Data: The "Clear" button will erase all operations and input data, letting you start a fresh calculation.
  • Calculate the Result: Press the "Calculate" button to see the final time result based on all entered data and selected operations.

Time Difference Between Two Time Points

Enter the start and end times to calculate the difference between them. You can use the dropdown menu or manually input the values. Select your preferred time format — 12-hour or 24-hour. Click the "Calculate" button to see the result.

Features and Use Cases

Adding Time: The calculator allows you to add two or more time values together. For example, if you want to know how much time two tasks will take — one lasting 1 hour 25 minutes and the other 2 hours 45 minutes — you can simply add these values together to get the total: 4 hours 10 minutes.

Subtracting Time: You can subtract lunch breaks or other pauses from the total time to get the actual working hours.

Using Multiple Values with Different Operations (+ and -): The calculator allows you to add and subtract multiple time values in a single calculation, with each value assigned to either an addition or subtraction operation. This makes it easy to factor in all time changes in one calculation. For example, when creating a schedule, you can set up a sequence of operations (adding work time and subtracting breaks) to get the total time.

Minute Conversion: In the "minutes" field, you can enter a value greater than 60, which can be useful for certain calculations.

Using as a Work Time Calculator: If you have time intervals assigned to different tasks, you can calculate the time spent on each task and get the total for the workday, week, or sprint. The time difference calculator is also useful for calculating the time spent on a task. For example, if you started working at 8:40 AM and finished at 11:15 AM, enter these values, and the calculator will show that you spent 2 hours and 35 minutes on the task.

Planning: By entering the departure and arrival times, you can find out the duration of a trip. Or, if you know your flight will take 8 hours and 45 minutes, and you depart at 2:30 AM, you can use the time calculator to figure out your arrival time (without considering time zone changes).

How the Time Calculator Works

The time addition / subtraction calculator works based on mathematical operations with time data. The operations include converting time into a single format (minutes), performing calculations, and then converting the result back into hours and minutes.

For example, let's say we want to add 1 hour 45 minutes and 2 hours 30 minutes.

Values:

h1 = 1, m1 = 45

h2 = 2, m2 = 30

Conversion to minutes:

tm1 = 1 × 60 + 45 = 105

tm2 = 2 × 60 + 30 = 150

Addition:

tm = tm1 + tm2 = 105 + 150 = 255

Conversion back:

hr = tm / 60 = 255 / 60 = 4.25 (4 without remainder)

mr = tm - hr × 60 = 255 - 4 × 60 = 15

Result:

4 hours 15 minutes

You can use these formulas to calculate the time manually. If you want to subtract hours and minutes, subtract tm2 from tm1 during the calculation, then proceed to the next step to get the result.

Calculating time when finding the difference between two time points in both 12-hour and 24-hour formats also works based on converting the entered time data into a single format, performing arithmetic operations, and converting the result back into hours and minutes. Here's a step-by-step explanation of how our calculator works with the corresponding formulas.

Start Time: 09:15

End Time: 15:45

Conversion to minutes:

Start Time: 9 × 60 + 15 = 555 minutes

End Time: 15 × 60 + 45 = 945 minutes

Calculating the difference:

tm = 945 - 555 = 390 minutes

Conversion back to hours and minutes:

h = 390 / 60 = 6 (without remainder)

m = 390 - 6 × 60 = 30

Result:

6 hours 30 minutes


If the start time is later than the end time (the difference spans over midnight):

Start Time: 22:30

End Time: 03:15 (next day)

Conversion to minutes:

Start Time: 22 × 60 + 30 = 1350 minutes

End Time: 3 × 60 + 15 = 195 minutes

Calculating the difference (since the end time falls on the next day, add 24 hours = 1440 minutes):

tm = 195 + 1440 - 1350 = 285 minutes

Convert tm back to hours and minutes:

h = 285 / 60 = 4 (without remainder)

m = 285 - 4 × 60 = 45

Result:

4 hours 45 minutes


12-hour format:

To correctly convert time in 12-hour format, we need to account for whether the time is AM or PM.

If AM and h1 < 12, then h1 × 60 + m1

If PM and h1 < 12, then (h1 + 12) × 60 + m1

If PM and h1 = 12, then 12 × 60 + m1

Next, as shown in the example above, we calculate the difference. If the difference is negative, it means the end time is earlier than the start time, in which case we add 1440 minutes to the end time.

We convert the result to hours and minutes and format the result:

If h ≥ 12, then h = h - 12 (indicate PM if the final time is greater than or equal to 12:00, otherwise AM)

For example, if we need to calculate the difference between 9:15 AM and 3:45 PM:

Start Time (AM):

h1 = 9, m1 = 15

End Time (PM):

h2 = 3, m2 = 45

Conversion:

For the start time:
tm1 = 9 × 60 + 15 = 555 minutes

For the end time:
tm2 = (3 + 12) × 60 + 45 = 945 minutes

Calculating the difference:

tm = 945 - 555 = 390 minutes

Conversion back:

h = 390 / 60 = 6 (without remainder)

m = 390 - 6 × 60 = 30

Final result:

6:30 PM



Our online time calculators will help you perform calculations quickly and accurately.

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