Date & Time
Hours Calculator
Hours: hours Calculator converts the start and end clock times to minutes, takes the difference, and formats the duration. Worked through below with real figures, and the calculator repeats the working on your own inputs — free, on-device, instant.
Give Hours Calculator your clock in and clock out and it returns the total duration straight away. Built to add up or measure time, it runs entirely on your device.
About this calculator
It matters whenever spans between dates, times or zones drive a plan, a deadline or a record. The governing relationship: Hours Calculator converts the start and end clock times to minutes, takes the difference, and formats the duration. See it on real numbers: From 09:15 to 17:45 is 8 hours 30 minutes = 8.5 hours . The calculator above applies the same steps to whatever you enter — computed locally, nothing sent anywhere.
How to use
- Enter the start time (clock-in).
- Enter the end time (clock-out).
- Press Calculate to total the hours.
- Read the duration in hours and minutes, total minutes, and decimal hours.
Why use Hours 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 when adding up hours worked
Use it for a travel-leg or commute duration
Use it for billable-hours logging
Use it when timing a meeting or session
Use it for shift-length and work-log totals
Use it when measuring the hours between two times
Technical notes
Hours Calculator converts the start and end clock times to minutes, takes the difference, and formats the duration.
Durations use the start and end times you enter and do not adjust for time zones or daylight saving unless a field asks.
All arithmetic runs in your browser using double-precision floating point, so extreme inputs may show tiny rounding differences.
FAQ
Does it handle overnight shifts?
Yes. If the end time is earlier than the start, the span is assumed to cross midnight and the hours are added accordingly.
What format should times use?
Enter times in 24-hour HH:MM format, for example 22:00 or 02:30.
What totals are shown?
The result gives hours and minutes, the total in minutes, and the total in decimal hours.
Does the Hours Calculator send my data to a server?
No. The Hours Calculator runs entirely in your browser — your inputs never leave your device, and nothing is uploaded or stored.
Worked example
From 09:15 to 17:45 is 8 hours 30 minutes = 8.5 hours.