Work hours calculator

Add up your shifts and work out your pay. Hours are typed as on a clock. Free, nothing to install, no sign-up.

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This calculator adds up your shifts and, if you tell it your hourly rate, works out what you are owed. Hours are typed the way a clock shows them — 9:00 to 17:30 — and it handles the conversion for the sum. You can add as many shifts as you like with the add button. It runs inside your browser and downloads as a PDF, which is what you need if you have to show it to someone.

Hours do not add up like ordinary numbers

One day is 7 hours 45 minutes and another is 6 hours 30. Add them as decimals and you get 14.15, which is nothing at all: 45 plus 30 is 75 minutes, that is an hour and a quarter, so the total is 14 hours 15 minutes. The clock counts in sixties and an ordinary calculator counts in tens, and that is the whole problem.

To get paid, you have to convert to decimals

The hourly rate multiplies DECIMAL hours, not clock time. To convert, divide the minutes by sixty: 45 ÷ 60 = 0.75, so 7 hours 45 minutes is 7.75 hours. Half an hour is 0.5 and a quarter is 0.25, which nearly everyone knows; it is the others that catch people out: 20 minutes is 0.33 and 10 minutes is 0.17.

The mistake that costs you money

Typing 7.45 instead of 7.75 when you multiply by the rate. It looks the same because the clock says "seven forty-five", but 0.45 of an hour is 27 minutes, not 45. At 12 an hour that is 3.60 short in ONE day; over twenty working days it is 72 missing. That is why this calculator asks for clock times and does the conversion itself: so that slip cannot happen.

Shifts that run past midnight

Clock on at 22:00 and off at 6:00 and a straight subtraction gives you minus eight hours. What you do instead is count up to midnight and carry on: 22:00 to 00:00 is 2 hours, and 00:00 to 06:00 is 6, so 8 altogether. The calculator works this out by itself whenever the finish time is earlier than the start, so you can enter the shift exactly as you worked it.

How to check the total

Add the hours in one column and the minutes in another, then convert the leftover minutes: every 60 minutes is one more hour. If you have five shifts of around eight hours, the total has to be somewhere near forty: 40.5 may well be right, but 4.5 or 405 means a decimal point in the wrong place. And the amount always has to be the total decimal hours times the rate.

Common questions

Do I type hours with a colon or a decimal point?

With a colon, the way a clock shows them: 8:30 is eight and a half hours. Typing 8.30 would mean 8 hours 18 minutes, which is something else entirely. The calculator converts to decimal by itself when it works out the money.

What is half an hour as a decimal?

0.5. A quarter of an hour is 0.25, three quarters is 0.75, twenty minutes is 0.33 and ten minutes is 0.17. The general rule is to divide the minutes by sixty.

Can I take the lunch break off?

The cleanest way is to split the day into two shifts, morning and afternoon, each with its own start and finish. The break then falls out on its own, and you also have a record of when each stretch was, which is what counts if you ever have to account for it.

Does it work for overtime or night shifts?

It adds the hours the same way, including shifts that run past midnight. What it does not do is apply premium rates: if your overtime or night hours are paid differently, work those shifts out separately at their own rate, because premiums depend on your contract and your country.

Are my times stored anywhere?

No. Everything happens inside your browser: the times you type never leave your device and are not stored anywhere. No account, no email address.

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