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MasterMath

Work Hours Calculator

How many hours you worked this week against the ones in your contract, and what that difference turns into over a year.

Currency and number format for

Balance for the week

—

Balance for the week—
Hours worked—
Of your contracted week—
Average per day worked—
Over a year, at this rate—
Which comes to—

How this was worked out

    The formula

    balance = hours worked − contracted hours

    Where it comes from

    Time recording exists because the gap between contracted and actual hours is almost never zero, and because half an hour a day goes unnoticed at the time but not in the annual total. Recording and adding up is the whole calculation; doing it every day is the hard part.

    How to work it out by hand

    1. Note the hours actually worked each day, minus the lunch break
    2. Add them up for the week's total
    3. Subtract the hours your contract sets
    4. Multiply the result by 52 to see the effect over a year

    What is worth knowing

    The figure that changes the conversation is the annual one. Half an hour extra every day is 2.5 hours a week, 130 a year and a little over sixteen full working days: three weeks of work given away. It works the same in reverse, which is why keeping a record is worth it even when there is no dispute: it is the only way to know what is being discussed. Bear in mind that breaks which are not working time do not count, and that many agreements settle excess hours with time off rather than money.

    Frequently asked questions

    Which hours do I record, clocked or actually worked?

    The ones actually worked: real working time, minus the lunch break if you are not obliged to be present through it. If your agreement says otherwise, the agreement wins.

    Is half an hour a day a lot?

    It is 130 hours a year, more than three full working weeks. Put in weeks it lands better than put in minutes.

    Are extra hours automatically overtime?

    Not always: it depends on whether they were agreed, how your agreement classifies them and whether they are settled with time off. This calculator gives you the number; the legal status is another matter.

    Can I use it for several weeks?

    It is built for one week, which is the period the contract is compared against. For a month, run it four times, or add the hours and multiply the contract by the weeks in the period.