Business Days Calculator | Free Working Days Tool  H1

Count, add or subtract working days with weekends and public holidays excluded

Use this free business days calculator to count working days between two dates, add business days to a start date, or subtract business days from a deadline.

The calculator excludes Saturdays, Sundays, and public holidays in supported countries, helping you plan deadlines, notice periods, payment dates, payroll schedules, delivery timelines, and project milestones without manually counting days.

Use these tools if you need a specific calculation:

Use the business days between dates calculator
Add business days to a date
Subtract business days from a date

Business Days Calculator Tool H2

Start date

End date or number of business days

Calculation type:

• Count business days between two dates
• Add business days to a date
• Subtract business days from a date

Country for public holidays

Calculate

Result

Print or save result

What This Business Days Calculator Does H2

This business days calculator helps you calculate working days without manually checking a calendar.

You can use it to:

• Count business days between two dates
• Add business days to a start date
• Subtract business days from a deadline
• Exclude weekends automatically
• Exclude public holidays by country
• Plan notice periods, payment terms, payroll dates, delivery windows, filing dates, and project deadlines

A business day usually means Monday to Friday, excluding public holidays. Calendar days count every day. This difference matters because 30 business days is not the same as 30 calendar days.

How to Use the Business Days Calculator H2

1. Choose your calculation type.
2. Enter your start date.
3. Enter your end date or the number of business days to add or subtract.
4. Select your country to exclude public holidays.
5. Click calculate.
6. Check your result and the excluded days.

For a simple date range, use the business days between two dates calculator.

For a future deadline, use the add business days to a date calculator.

For a deadline that needs backwards planning, use the subtract business days from a date calculator.

What Is a Business Day? H2

A business day is usually a weekday that is not a public holiday.

In most countries, this means Monday through Friday. Saturdays and Sundays are normally excluded. Public holidays are also excluded when the calculator supports the country you select.

For example, if a deadline is due in 10 business days, weekends do not count. If a public holiday falls inside the period, that date does not count either.

Business Days vs Calendar Days H2

Business days and calendar days are not the same.

Calendar days count every day on the calendar, including Saturdays, Sundays, and public holidays.

Business days count only working weekdays, usually Monday to Friday, and exclude public holidays where applicable.

This is why a 30-day calendar deadline may end after about one month, while a 30-business-day deadline usually takes around six calendar weeks. If public holidays fall inside the period, the final date may move even further.

Always check whether your contract, policy, invoice, or deadline refers to business days or calendar days before calculating.

How We Calculate Business Days H2

The calculator checks each date in your selected range.

A date is counted as a business day only when:

• It falls on a weekday
• It is not a Saturday or Sunday
• It is not a public holiday in the selected country, where holiday support is available

If a date falls on a weekend or a selected public holiday, it is skipped.

This makes the calculator useful for standard Monday-to-Friday workweeks. It is not a replacement for specialist legal, payroll, employment, or court deadline advice where custom rules apply.

Last reviewed: June 2026
Best for: Standard Monday to Friday working patterns
Useful for: HR, payroll, project planning, delivery estimates, payment terms, and deadline planning

Common Business Day Calculations H2

When Should You Use a Business Days Calculator? H2 

Use a business days calculator whenever the date matters and weekends or public holidays could change the result.

Common uses include:

• Notice periods:  Employees and HR teams use business-day calculations to verify resignation dates, notice periods, probation periods, and final working days. Use the notice period calculator to find the last working day.
• Project deadlines: Project managers use business days to plan milestones, delivery dates, review periods, and completion windows.
• Payment terms: Businesses use business days to calculate invoice due dates, payment deadlines, settlement periods, and processing times.
• Legal and filing deadlines: Legal teams often need to carefully count working days. If a deadline excludes weekends or public holidays, manual counting can lead to costly mistakes.
• Shipping and logistics: Delivery estimates often use business days instead of calendar days. A five-business-day delivery window may take longer than five calendar days if it crosses a weekend or public holiday.

Why Manual Counting Goes Wrong H2

Manual business day counting can look simple until the date range spans a weekend, a public holiday, a month-end, or a year-end.

The most common mistakes are:

• Counting calendar days instead of business days
• Forgetting to exclude weekends
• Missing a public holiday
• Counting the start date when it should be excluded
• Excluding the end date when it should be included
• Using the wrong country holiday calendar
• Assuming every deadline follows the same rule

A calculator reduces those risks by applying the same rules consistently.

Business Days by Country

Business days are not identical everywhere.

Many countries use a Monday-to-Friday working week, but public holidays differ by country. A date that counts as a business day in one country may be a public holiday in another.

This calculator supports public holiday exclusions for selected countries, including commonly searched locations such as the United States, United Kingdom, Canada, Australia, South Africa, Singapore, Japan, Germany, France, and Brazil.

Select your country before calculating whether public holidays affect your result.

Business Day Examples H2

Business Day Calculator Formula

For a standard Monday to Friday workweek, the basic idea is:

Business days = calendar days minus weekends minus public holidays

A calculator is more reliable than a simple formula because it checks the actual dates in the range. This matters when the period crosses weekends, public holidays, month boundaries, leap years, or year-end dates.

When Not to Rely on a Standard Business Days Calculator

This calculator is designed for standard business day planning. You should check specialist rules before relying on the result for:

• Court deadlines
• Tax deadlines
• Employment disputes
• Contractual penalties
• Regional holidays not covered by the selected country
• Company shutdown days
• Shift work patterns
• Four-day workweeks
• Industries with non-standard working days

For high-risk deadlines, use the calculator as a planning aid and confirm the final date with the relevant authority, the contract, the employer, the adviser, or the legal professional.

Related Calculator Tools

Use these tools for more specific business day calculations:

• Business days between two dates
• Add business days to a date
• Subtract business days from a date
• Notice period calculator
• Deadline calculator

Frequently Asked Questions