It is ideal for shift lengths, flight times, study sessions, server outages or anything else you need to total precisely. Because it accepts full dates as well as times, overnight and multi-day spans are handled correctly - a shift from 22:00 to 06:00 correctly returns 8 hours rather than a negative number. For calendar-day counts without times, use the Date Calculator.
Calculator
How to use the Time Duration Calculator
- Set the start date and time.
- Set the end date and time.
- Read the duration broken into days, hours, minutes.
- Copy the decimal-hours figure for timesheets or invoices.
About this tool
The Time Duration Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Calculating shift length for payroll.
- Measuring flight or travel time.
- Totaling study or workout sessions.
- Logging incident or downtime duration.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Does it handle overnight times?
Yes, because both fields include a date. Set the end date to the following day for an overnight span.
Can I get decimal hours for invoicing?
Yes. The "Total hours" result is decimal, so you can multiply it directly by your hourly rate.
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