How do I calculate worked hours from start and end times?

Subtract the start time from the end time to get the shift length, then deduct any unpaid break. This tool does it for every day and adds up the week for you.

How are overnight shifts handled?

If a day's end time is earlier than its start time, the tool assumes the shift crosses midnight and adds 24 hours, so a 22:00 to 06:00 shift is counted as 8 hours.

How are unpaid breaks deducted?

Enter the break in minutes for each day and it is subtracted from that day's shift length. A 9-hour shift with a 60-minute unpaid break counts as 8 worked hours.

How is overtime worked out?

If you set an overtime threshold (in weekly hours) and a multiplier, hours up to the threshold are paid at your normal rate and hours above it at the rate times the multiplier, such as 1.5 for time-and-a-half.

What are decimal hours?

Decimal hours express time as a fraction rather than minutes — 7 hours 30 minutes is 7.5 decimal hours. Payroll systems usually want decimal hours, which is why the tool shows both.

How accurate is the pay estimate?

The pay figure is a straightforward estimate — worked hours times your rate, with hours over the overtime threshold paid at the multiplier. It does not deduct tax, pensions or other withholdings, so treat it as gross-pay guidance only.

Are my hours or pay rate sent anywhere?

No. The calculator is privacy-first — all times, breaks and pay figures stay in your browser and are never uploaded or stored on a server.

Work Hours Calculator

Work hours calculator

This calculator adds up a full week of shifts in one place. Enter the start time, end time, and any unpaid break for each day, and it tallies the daily and weekly totals in hours, minutes, and decimal hours — with an optional gross-pay estimate. It is built for timesheets, shift work, and freelancers logging billable time.

How it works

For each day, the tool subtracts the start time from the end time to get the shift length, then deducts the unpaid break:

daily hours = (end − start) − break

If the end time is earlier than the start time, it adds 24 hours so overnight shifts count correctly. The daily figures are summed into a weekly total shown as hours-and-minutes and as decimal hours. If you expand the pay section and set an hourly rate, an overtime threshold (weekly hours), and a multiplier, hours above the threshold are paid at the higher rate for a gross-pay estimate.

Input	Purpose
Start / End time	Defines each shift
Break (minutes)	Unpaid time subtracted
Hourly rate	Optional gross-pay basis
OT threshold / multiplier	Pays excess hours at a higher rate

Example

A shift from 09:00 to 17:30 with a 30-minute unpaid break is 8.5 − 0.5 = 8 hours. Five such days give 40 hours for the week. At a £12 rate with a 37.5-hour overtime threshold and a 1.5 multiplier, the first 37.5 hours pay £450 and the extra 2.5 hours pay £45 (2.5 × 12 × 1.5), for £495 gross.

It is privacy-first: your hours, breaks and pay rate never leave your browser.