Business Days Calculator

Use this working days calculator to easily calculate the number of business days (exluding weekeends) between any two given dates. Don't forget to account local and official holidays on top of that to get a correct number of total working days.

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  1. How to calculate working days / business days?
  2. The business day and the week

    How to calculate working days / business days?

This working days calculator counts as business days all days between Monday and Friday, regardless of whether they are holidays in some regions. Therefore, you need to be aware of your country’s holiday calendar and subtract the said amount of days from the final result.

If you wish to know how many work days you have until a job deadline, until retirement or even until your wedding, you simply need to enter the start date and the end date of the period you are interested in. The result will show you all days until the said date excluding the weekends. You can also choose whether to include the last day of the period in the final calculation.

For example, if you have to deliver a project by Dec 1, 2021, enter that date in the "end date" field, and if you are starting from today, leave the "start date" field as it is by default. Click "Calculate" and you will get the number of work days you will have. This way you will know how many business days are available for you to complete the job. If you will only be available to work on that project from Nov 1 onwards, just enter that as a starting date instead.

Our business days calculator does not account for country-specific holidays, so if there are official holidays particular to your country or region, you need to account for that by manually subtracting the number of days with such holidays from the result you get from our calculator.

    The business day and the week

A business day, also known as a working day, is any official work day. In most regions this includes the days between Monday and Friday (including). It excludes the weekend and official holidays in the given country; these can be religious or national holidays. There are about 20 business days in a month.

But why do we work from Monday to Friday in Western countries? And why is a week seven days?

Although it is widely believed that the idea of a seven day week comes from Babylon and is based on the Moon cycles, there are those who disagree. Some claim that the Jewish people had their own completely separate reasons for creating a similar way of dividing the month. In defense of the latter theory there seem to be evidence to suggest that Judaists used such seven days based cycles unrelated to the moon no later than the 6th century BC.

While we might never have a straight answer to how weeks were invented, where, when, and why; one thing is obvious – a large part of the world today uses weeks comprised of seven days, which also mark when the work days (also school days) and when the rest days are. This is usually applied alongside the Gregorian calendar, although not exclusively. What is also common between most countries is having two rest days in the week, although in different cultures it varies which days exactly those would be. In most of Western cultures the rest days are Saturday and Sunday, and the working days - Monday through Friday.

working days business

The two-day weekend was applied in the UK, US, and Canada by 1955. Multiple factors led to that and it took decades for the idea to be accepted by employers. The 40-hour work week only became the rule throughout Europe in the 70s, followed by the Middle East.

This calculator is not suitable for some countries, where the weekend starts on Friday and ends on Saturday, or where there is a one-day weekend.

Cite this calculator & page

If you'd like to cite this online calculator resource and information as provided on the page, you can use the following citation:
Georgiev G.Z., "Business Days Calculator", [online] Available at: URL [Accessed Date: 27 Sep, 2021].