About this work hours calculator
Add up hours worked across one or more shifts, subtracting break time, right in your browser. Enter each shift on its own line as "start,end" or "start,end,break minutes" using 24-hour times — for example "09:00,17:30,30" — and this tool calculates each shift's worked time and totals them, automatically handling a shift that crosses midnight. Use this workspace to prepare a result you can review before putting it to use. All processing takes place on your device, without an account or an upload of your inputs. Check the examples to understand the expected output, read the limitations for the supported scope, and reset the form when you want to start a separate task.
How the work hours calculator works
For each line, worked minutes = end time − start time (adding 24 hours if end is not after start, to handle overnight shifts) − break minutes; all shifts' worked minutes are summed and converted to hours.
Work Hours Calculator examples
"09:00,17:30,30" and "09:00,18:00,60"
16 total hours across 2 shifts
"22:00,06:00,30"
7.5 total hours (overnight shift)
Limitations & privacy
Up to 31 shift lines per run. Break minutes can't exceed 12 hours or the shift's own length, and times must be valid 24-hour clock values.
Inputs and results stay in this browser. Only tool identifiers are stored for your recently used tools. You can clear that history from the directory.
Work Hours Calculator: frequently asked questions
How does the work hours calculator work?
For each line, worked minutes = end time − start time (adding 24 hours if end is not after start, to handle overnight shifts) − break minutes; all shifts' worked minutes are summed and converted to hours.
What can I inspect in the work hours calculator result?
The shift-by-shift timesheet helps you check the result before using it. Up to 31 shift lines per run. Break minutes can't exceed 12 hours or the shift's own length, and times must be valid 24-hour clock values.
Does the work hours calculator upload my input?
Processing happens in your browser. No tool input or output is uploaded to a server. Use Reset to clear the current workspace before starting a separate task.
Updated September 20, 2026