Date & Time
Time Calculator
Time — time Calculator adds and subtracts times and durations, carrying minutes and hours correctly. This page runs that same calculation on your numbers, in your browser: no signup, no uploads, nothing stored.
Time Calculator is a browser-based way to add up or measure time. Feed it your from time and to time and it computes the total duration on the spot, keeping your data local.
About this calculator
Time Calculator adds and subtracts times and durations, carrying minutes and hours correctly. That is the whole of the calculation — the mistakes happen in the inputs. It matters whenever spans between dates, times or zones drive a plan, a deadline or a record. Worked example: Adding 2 h 45 min to 10:30 gives 13:15 . Use the calculator with your own figures; it runs entirely on your device.
How to use
- Enter the starting time.
- Enter the ending time.
- Press Calculate to total the time.
- Read the elapsed time in hours, minutes, and decimal hours.
Why use Time 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 a quick hours-and-minutes total
Use it for elapsed-time checks
Use it for a travel-leg or commute duration
Use it for billable-hours logging
Use it when measuring the hours between two times
Use it when logging start and end times
Technical notes
Time Calculator adds and subtracts times and durations, carrying minutes and hours correctly.
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
What does this time calculator do?
It finds the duration between a start time and an end time, including spans that cross midnight.
What time format is expected?
Use 24-hour HH:MM, such as 09:00 or 17:30.
What if the end is before the start?
It treats the span as overnight and adds 24 hours so the duration stays positive.
Does the Time Calculator send my data to a server?
No. The Time Calculator runs entirely in your browser — your inputs never leave your device, and nothing is uploaded or stored.
Worked example
Adding 2 h 45 min to 10:30 gives 13:15.