What Is the Hours Calculator?
This web-based hours calculator helps you calculate hours between two times, sum two or more time periods, convert between time units (e.g., minutes to hours), calculate work hours in a week, and add or subtract time from any date and time.
It is similar to the date calculator, but it focuses on time instead of dates.
How to Use the Hours Calculator
You can use the calculator for six different tasks.
Measure time between two times
Calculate the number of hours, minutes, and seconds between two times.
- Choose Time Duration in the top menu.
- Choose Time only for less than 24 hours, or Date and time to calculate time over more than one day.
- Set a start and end time or click Now to use the current time.
- If you have a break, enter it in minutes. This will be deducted from your total hours.
- Click the button to see the duration in hours and minutes, decimal hours, total minutes, and total seconds.
Sum multiple time periods
Calculate total time spent on an activity or project, based on multiple sessions.
- Choose Sum Hours in the top menu.
- Enter the hours, minutes, and seconds in the time periods you want to sum. If you need more than two periods, click Add More Inputs to add more.
- Click See Total Time to see your sum.
Convert time units
Convert between different units of time, e.g., seconds to hours. Works with seconds, minutes, hours, days, weeks, and years.
- Choose Convert Time in the top menu.
- Enter the number and time unit you want to convert and set the target unit (the default is minutes to hours).
- Click Convert to see the result.
Calculate work hours and minutes (time card)
Calculate the number of hours worked in a week, based on daily sessions or shifts.
- Choose Work Hours in the top menu.
- Add the start and end times for each day, and optionally the time spent on break.
- The daily totals appear automatically on the right, and the weekly total shows at the bottom.
Add hours or minutes to a time
See what time a task or event will finish when you know how long it takes.
- Choose Add Hours to Time in the top menu.
- Choose Time only to show just the time in the sum, or Date and time to include a date.
- Enter your start time or use Now for the current time.
- Enter the number of hours and minutes you want to add.
- Click Calculate New Time to see the result.
Subtract hours or minutes from a time
Work backwards from a deadline or event time to see when you need to start work or leave.
- Choose Subtract Hours from Time in the top menu.
- Choose Time only to show just the time in the sum, or Date and time to include a date.
- Enter your start time or use Now for the current time.
- Enter the number of hours and minutes you want to subtract.
- Click Calculate New Time to see the result.