What does this tool do?
This tool calculates the time between a start and end time, subtracts any break minutes you enter, and shows the result as hours and minutes, total minutes, and decimal hours. It is handy for anyone measuring shift length, work hours, or the gap between two times.
How to use it
- Enter your values into the fields.
- The result is calculated instantly.
- Read or copy the result.
Net duration with breaks removed
Enter the start and end time, then add the break in minutes and the tool subtracts it from the total automatically. For example, 09:00 to 17:30 with a 60-minute break gives 7 hours 30 minutes of net working time. The result appears in three formats: readable hours and minutes, total minutes for payroll calculations, and decimal hours (such as 7.50). The decimal form makes multiplying by an hourly rate straightforward.
Shifts that cross midnight
If the end time is earlier than the start time, the tool assumes the shift rolls over into the next day and adds 24 hours to the span. This means a night shift starting at 22:00 and ending at 06:00 is correctly calculated as 8 hours. You can measure overnight work easily without adjusting the clock or entering any dates.
Frequently asked questions
What are decimal hours used for?
Decimal hours (such as 7.50) make it easy to multiply duration by an hourly rate. 7 hours 30 minutes is shown as 7.50 hours, which is ideal for payroll and invoicing.
Does it handle shifts that cross midnight?
Yes. If the end time is before the start time, the tool rolls over into the next day and adds 24 hours, so overnight shifts come out correctly.
Can I leave the break at zero?
Of course. Set the break field to 0 and no time is deducted, so the result shows the full span between the start and end times.
Is Time Duration Calculator free?
Yes. Time Duration Calculator and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. Time Duration Calculator works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.