Date & Time
Time Duration Calculator
Time Duration — time Duration Calculator returns the elapsed duration between two times in hours and minutes. This page runs that same calculation on your numbers, in your browser: no signup, no uploads, nothing stored.
Use Time Duration Calculator to add up or measure time: give it your start of period and end of period, press Calculate, and read off the total duration — all worked out on your device.
About this calculator
Time Duration Calculator returns the elapsed duration between two times in hours and minutes. It matters whenever spans between dates, times or zones drive a plan, a deadline or a record. Here is the calculation on real numbers: Between 22:30 and 06:15 the next morning is 7 h 45 min (crossing midnight). For your own figures, use the calculator above — same method, your inputs, computed on-device.
How to use
- Enter the start time in HH:MM.
- Enter the end time in HH:MM.
- Press Calculate to measure the duration.
- Read the duration in hours, minutes, and decimal hours.
Why use Time Duration Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Adds and subtracts clock times to the minute, including breaks and overnight spans. Double-check shift starts, break times and rounding before relying on the result.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Use it for shift-length and work-log totals
Use it when measuring the hours between two times
Use it for elapsed-time checks
Use it when checking how long something ran
Use it for billable-hours logging
Use it for a study or practice session
Technical notes
Time Duration Calculator returns the elapsed duration between two times in hours and minutes.
Durations use the start and end times you enter and do not adjust for time zones or daylight saving unless a field asks.
Because it runs locally, results appear instantly with no server round-trip.
FAQ
Can it span midnight?
Yes. When the end time is before the start, the duration is assumed to cross midnight and 24 hours are added.
What happens if a time is blank?
Both times are required; leaving one blank returns a clear prompt rather than a zero result.
What units are returned?
You get hours and minutes, the total minutes, and the total decimal hours.
Does the Time Duration Calculator send my data to a server?
No. The Time Duration Calculator runs entirely in your browser — your inputs never leave your device, and nothing is uploaded or stored.
Worked example
Between 22:30 and 06:15 the next morning is 7 h 45 min (crossing midnight).