A business days calculator helps you count working days between two dates, add business days to a start date, or subtract working days from a deadline.
Use the tools below for your specific calculation. Each one handles a different working day task.
Use these tools for specific calculations:
Business days between two dates Add business days to a date Subtract business days from a date Notice period calculator Deadline calculator
What Is a Business Days Calculator?
A business days calculator counts working days between two dates, adds working days to a start date, or subtracts working days from a deadline.
It excludes Saturdays, Sundays, and public holidays in your selected country. This makes it more accurate than counting calendar days by hand, especially when a date range crosses weekends, public holidays, or a year-end.
Business days and calendar days are not the same. A 30-business-day deadline takes around six calendar weeks. A 30-calendar-day deadline takes exactly one month. Always check which one your contract, invoice, or policy refers to before you calculate.
Who Uses a Business Days Calculator?
Business day calculations come up in almost every industry and role.
You are likely using a business days calculator because a deadline, notice period, payment date, or delivery window is measured in working days, not calendar days.
Common users include:
- Anyone who needs to avoid manually counting days on a calendar
- HR and payroll teams calculating notice periods, probation periods, and payroll dates
- Project managers planning delivery milestones and review windows
- Legal and compliance teams tracking court filing deadlines and contractual obligations
- Finance teams calculating invoice due dates and payment settlement periods
- Logistics teams estimating shipping and delivery windows
The 5 Business Day Calculators on This Site
This site gives you five separate tools. Each one handles a different type of working day calculation.
Business Days Between Two Dates
This calculator counts the number of working days between a start date and an end date. It excludes weekends and public holidays in your selected country.
Use this when you need to know how many working days fall between two specific dates. Common uses include project planning, contract timelines, and payment term verification.
Use the business days between dates calculator
Add Business Days to a Date
This calculator adds a set number of working days to a start date and returns the resulting business date.
Use this when a deadline is expressed as a number of business days from today, or from a specific start date. Common uses include delivery estimates, client response deadlines, and payment due dates.
Use the add business days calculator
Subtract Business Days from a Date
This calculator subtracts a set number of working days from a deadline and returns an earlier business date.
Use this when you need to plan backwards from a fixed deadline. Common uses include document preparation windows, submission cutoffs, and backwards project scheduling.
Use the subtract business days calculator
Notice Period Calculator
This calculator finds your last working day based on a resignation or notice date and a notice period length.
Use this when you or an employee needs to confirm a final working day. It accounts for weekends and public holidays so the result reflects actual working days, not calendar days.
Use the notice period calculator
Deadline Calculator
This calculator finds a business day deadline by adding a set number of working days to a start date.
Use this when a legal, contractual, or project deadline is measured in business days. It excludes weekends and public holidays in your selected country to give you an accurate final date.
What Counts as a Business Day?
A business day is a weekday that is not a public holiday.
In most countries, this means Monday through Friday. Saturdays and Sundays are never counted. Public holidays are excluded when you select your country from the dropdown.
For example, a 10-business-day deadline does not include the weekends inside that period. If a public holiday falls within the range, it does not count either. The final date moves forward to the next working day.
Business Days vs Calendar Days
Business days and calendar days are not the same. Business days count Monday to Friday and exclude public holidays. Calendar days count every day, including weekends and holidays. A 30-business-day deadline usually takes about six calendar weeks, while a 30-calendar-day deadline ends after exactly one month.
Read the full business days vs calendar days comparison for contract terms, shipping windows, and legal deadline examples.
Common Business Day Questions
These are the most common business days calculator questions we get asked.
| Question | Answer |
|---|---|
| How long is 5 business days? | Five business days is one standard working week, Monday to Friday, with no public holidays. |
| How long is 10 business days? | Ten business days is two working weeks. If no public holidays fall in the period, it covers two Monday-to-Friday spans. |
| How long is 30 business days? | Thirty business days is around six calendar weeks. Public holidays extend the period. |
| How long is 60 business days? | Sixty business days is around twelve calendar weeks, or approximately three months. |
| How long is 90 business days? | Ninety business days is around eighteen calendar weeks, or just over four months. |
How the Calculator Works
Each business days calculator on this site checks every date in your selected range.
A date counts as a business day only when it falls on a weekday and is not a public holiday in your selected country. Saturdays and Sundays are always skipped. Public holidays are skipped when holiday support is available for your country.
These calculators are designed for standard Monday-to-Friday working patterns. They are useful for planning and estimation. For high-risk legal, payroll, employment, or court deadlines, confirm the final date with the relevant authority, your contract, or a qualified adviser.
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
Why Use a Business Days Calculator Instead of Counting Manually
Manual counting of business days looks simple until the date range crosses 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 in the date range
- Counting the start date when it should be excluded
- Using the wrong country holiday calendar
- Assuming all deadlines follow the same rules
A business days calculator applies the same rules consistently every time and removes the risk of a counting error.
Business Days by Country
Business days are not identical in every country.
Most countries use a Monday-to-Friday working week, but public holidays differ significantly. A date that counts as a business day in one country is often a public holiday in another.
These calculators support public holiday exclusions for over 100 countries, including the United States, United Kingdom, Canada, Australia, South Africa, Singapore, New Zealand, Japan, Germany, and Brazil.
You can verify official public holidays for your country on your government’s official website.
Select your country before calculating to make sure public holidays are excluded correctly from your result.
When Not to Rely on a Standard Calculator
These tools are designed for standard business day planning. Check the specific rules that apply before relying on a result for:
- Court and tribunal deadlines
- Tax filing deadlines
- Employment disputes and termination dates
- Contractual penalty clauses
- Regional or local holidays not covered by the selected country
- Company-specific shutdown days
- Non-standard working patterns such as four-day workweeks or shift work
For high-risk deadlines, use these calculators as a planning aid and confirm the final date with the relevant contract, employer, legal professional, or authority.
Frequently Asked Questions
These frequently asked questions cover how the business days calculator works and when to use it.
| Question | Answer |
|---|---|
| What is a business day? | A business day is usually Monday to Friday, excluding public holidays. Saturdays and Sundays are not counted as business days. |
| Are business days and working days the same? | In most everyday use, yes. Both terms refer to Monday to Friday, excluding public holidays. |
| Does Saturday count as a business day? | No. Saturday is not counted as a business day unless a specific contract or country rule states otherwise. |
| Does Sunday count as a business day? | No. Sunday is not counted as a business day. |
| Do public holidays count as business days? | No. Public holidays are excluded when the selected country holiday calendar applies. |
| What is the difference between business days and calendar days? | Calendar days count every day. Business days count only weekdays and exclude public holidays where applicable. |
| How many business days are in a week? | A standard working week has five business days: Monday, Tuesday, Wednesday, Thursday, and Friday. |
| How many business days are in a month? | Most months have between 19 and 23 business days before public holidays are removed. The exact number depends on the month, the year, and the country. See the full month-by-month breakdown for the US, UK, South Africa, and Australia. |
| How accurate is this calculator? | These calculators are designed for standard Monday to Friday workweeks with selected country public holidays. They are suitable for general planning. High-risk deadlines should always be confirmed against the official rules that apply. |
| Can I use this for notice periods? | Yes. Use the dedicated notice period calculator at https://workingdayscalc.com/notice-period-calculator/ to find a last working day. |
| Can I calculate a business day deadline? | Yes. Use the deadline calculator at https://workingdayscalc.com/deadline-calculator/ to find a business day deadline from any start date. |