Hours Calculator

Hours between two times, and the week that totals from them.

Add up hours worked from start and end times, with breaks and overtime. Shows hours and minutes alongside decimal hours, because payroll needs the second one.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Start and end times for each day of the week
Day	Start	End	Break	Worked
Monday				7:307.5
Tuesday				7:307.5
Wednesday				7:307.5
Thursday				7:307.5
Friday				7:307.5
Saturday				—
Sunday				—

Times can be written 9:00, 0900, 9am or 9.00. Leave a day blank if it was not worked. A finish time earlier than the start is read as a shift running past midnight and marked +1d.

Total for the week37:3037.5 decimal hours

Both figures say the same thing. The first is how people write hours down, the second is what payroll multiplies by a rate, and they are not interchangeable: seven hours forty-five minutes is 7.75, never 7.45.

Hourly rate, if you want the payOvertime after

Forty hours is the US federal threshold under the Fair Labor Standards Act. Plenty of places use a daily threshold instead, or a different weekly one, so check what actually applies to you.

How the Hours Calculator works

Enter start and end times for each day, take off unpaid breaks, and get the week both ways: hours and minutes as you would write them down, and decimal hours as payroll multiplies them. A finish time earlier than the start is read as a shift running past midnight rather than as a negative day, which is the thing that breaks most timesheet tools.

Also known as: time card calculator · timesheet calculator · hours between two times · work hours calculator · payroll hours calculator

Where to go next

The Hours question rarely arrives on its own. These are the ones that usually come with it:

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Frequently asked questions

Why show decimal hours as well as hours and minutes?

Because they are different numbers for the same thing and mixing them costs money. Seven hours and forty-five minutes is 7.75 decimal hours, not 7.45. Writing 7.45 on a timesheet loses eighteen minutes of pay a shift, and it happens constantly because both look like perfectly ordinary numbers.

How do I enter a night shift?

Normally. A finish time earlier than the start is taken as running past midnight, so 22:00 to 06:00 comes out as eight hours and is marked +1d. Reporting minus sixteen hours, which is what subtracting naively gives, is the behaviour that makes people abandon a timesheet tool.

What time formats can I type?

9:00, 0900, 9am, 9.00 and 09:00 all work, in either case, with or without a space before am or pm. A timesheet gets filled in quickly and refusing 9.30am helps nobody.

When does overtime start?

Forty hours a week is the US federal threshold under the Fair Labor Standards Act, and it is the default here. Plenty of places use a daily threshold instead, or a different weekly one, so the figure is adjustable and you should check what actually applies to you.

Are breaks paid?

The break minutes entered here come off the total, so they are treated as unpaid. Paid breaks simply need not be entered.

Put this calculator on your own site

Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.

The one-line version

<iframe src="https://www.thecalclibrary.com/embed/hours-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Hours Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;margin:6px 0 0;color:#64748b">Powered by <a href="https://www.thecalclibrary.com/hours-calculator" style="color:#64748b">Hours Calculator</a> from The Calc Library</p>

The only condition is that the credit line below the frame stays in place. That one line is what pays for the tool being free — it is how anyone else finds it.