Total your work hours from shift start and end times, subtract unpaid breaks, and multiply across multiple days — with decimal hours for payroll. This free hours calculator needs no signup and runs entirely in your browser.
What is the Hours Calculator?
An hours calculator turns shift times into totals: enter when you started, when you finished, how long your unpaid break was, and how many identical days to count — and get back the exact total in hours and minutes plus the decimal figure payroll systems expect.
The math sounds trivial until overnight shifts, unpaid breaks and multi-day rosters get involved. This free calculator handles all of it: shifts that cross midnight are detected automatically, break minutes are subtracted per day, and a ‘number of days’ multiplier totals a whole week of identical shifts in one click. Results show the plain hours-and-minutes total, the decimal-hours figure (7.5 instead of 7:30) and a per-day breakdown for verification.
It runs entirely in your browser with no signup and no data sent anywhere, and it works on phones and desktops. Use it for timesheets, invoices, overtime checks, roster planning, or any situation where ‘roughly eight hours’ isn’t precise enough.
How to use the Hours Calculator
- Enter your shift start and end times using the time pickers.
- Enter your unpaid break in minutes (or 0 if you take none).
- Enter how many identical days this applies to — 1 for a single shift, 5 for a working week.
- Press Calculate to see the total in hours and minutes, as decimal hours, and the per-day breakdown.
- Overnight shifts are handled automatically: if the end time is earlier than the start, the tool assumes the shift crosses midnight.
Hours Calculator use cases
Filling in timesheets
Employees total a week’s shifts — including unpaid lunches — into one decimal figure for timesheets, avoiding the arithmetic errors that cause pay disputes.
Freelancers billing hours
Contractors convert irregular hours into billable decimal hours for invoices: 6 hours 45 minutes becomes 6.75, ready to multiply by the hourly rate.
Managers planning rosters
Managers sanity-check scheduled rosters: multiply the daily shift by headcount days to verify total labor hours stay within budget.
Tracking overtime
Overtime is simply total hours minus contracted hours. Run the calculator, subtract your standard week, and the remainder is overtime due.
Tips
- Break time is subtracted per day, so a 30-minute lunch over 5 days removes 2.5 hours from the weekly total.
- Decimal hours (e.g. 7.5) are what payroll systems want — use the decimal figure when submitting timesheets.
- For shifts that vary day to day, run the calculation once per shift and add the totals together.
- Crossing midnight? Just enter the real start and end times — the tool detects overnight spans automatically.