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 it 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.
Try these 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.
A few good questions
How is the result produced?
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.
Are my inputs sent to a server?
No. Inputs and results are processed locally and are not uploaded or included in telemetry. Copying or downloading is your choice.
What are the limits of this tool?
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.
Updated September 19, 2026