Count business days between two dates, or add/subtract business days from a date. Supports US, UK, and EU holiday calendars plus custom holidays.
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Business Days Calculator is a free, browser-based tool
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Time & Date Tools collection.
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Use the tool below, then scroll down for detailed documentation, frequently asked questions, and related resources.
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Add custom holiday dates (one per line, YYYY-MM-DD format):
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Business Days
What is Business Days Calculator?
Business Days Calculator is a free online tool that counts working days (Monday–Friday) between two dates, excluding weekends and optionally excluding public holidays. It supports three modes: count business days between two dates, add a number of business days to a date, or subtract business days from a date. The tool includes built-in holiday calendars for US Federal, UK Bank, and EU Common holidays, plus a custom holiday input for any country or organization. All calculations run entirely in your browser.
When to use it?
Use Business Days Calculator when working with deadlines measured in business days: legal notice periods, payment terms (Net 30 business days), shipping estimates, SLA calculations, contract milestones, and project planning. It is especially useful for determining delivery dates that skip weekends and holidays, calculating invoice due dates, and planning sprint or milestone timelines.
Common use cases
Project managers use Business Days Calculator to plan realistic sprint timelines and milestone dates that account for holidays. Finance professionals use it for calculating payment due dates and settlement periods measured in business days. Legal teams use it for court filing deadlines and statutory notice periods. HR departments use it for calculating probation end dates and notice periods. Logistics planners use it for estimating shipping and delivery windows based on working days.
What counts as a business day
A business day is any day that is not a Saturday, Sunday, or public holiday. This tool counts Monday–Friday by default and optionally subtracts holidays from a chosen calendar (US Federal, UK Bank, EU Common, or your own custom list). Both endpoints are inclusive — if the start and end are the same weekday, that’s 1 business day. This inclusive counting is what trips people up on deadlines, so it’s worth confirming against your specific use case.
Three operations, one tool
Mode
Answers
Count between dates
”How many working days from A to B?”
Add business days
”What date is 10 working days from now?”
Subtract business days
”When must I start to finish by a deadline?”
The add/subtract modes are the ones that save real time — for SLA deadlines, payment due dates, and legal notice periods, you need the calendar date that lands N working days away, skipping weekends and holidays automatically.
Where business-day math actually matters
This isn’t academic — entire business processes run on working-day counts:
SLAs — “resolved within 5 business days” excludes the weekend the ticket sat over.
Net terms — “Net 10 business days” payment windows.
Settlement — markets use T+2 (trade settles 2 business days later).
Legal notice — many jurisdictions count notice periods in working days.
Getting weekends and holidays right is the difference between hitting and missing a contractual deadline.
Holidays only count on weekdays
A subtle correctness point: the tool only deducts a holiday if it falls Monday–Friday within your range. A holiday on a Saturday is already excluded (it’s a weekend), so it doesn’t double-reduce the count. Click “view holidays included” to see exactly which dates were subtracted. For plain calendar-day spans (weekends included), use the Date Difference Calculator instead.
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Essential terms and definitions related to Business Days Calculator.
Business Day
A day on which normal business operations are conducted — typically Monday through Friday, excluding public holidays. Business days are used as the standard unit for deadlines in legal contracts, financial settlements (T+2), shipping estimates, and service level agreements. The exact definition can vary by country, industry, and organization.
SLA (Service Level Agreement)
A contract that defines the expected level of service, including response and resolution times measured in business hours or business days. For example, a "5 business day SLA" means the service provider has 5 working days (excluding weekends and holidays) to resolve the issue.
Net Terms
Payment terms in invoicing that specify the number of days (often business days) within which payment is due. "Net 30" means payment is due within 30 days of the invoice date. "Net 10 business days" means payment is due within 10 working days. The Business Days Calculator can determine the exact due date for any net-terms calculation.
Settlement Period
The time between a trade execution and its settlement (actual exchange of securities and cash). Most stock markets use T+2 settlement, meaning the trade settles 2 business days after the trade date. Bond and currency markets may use different settlement periods. Business day calculations are critical for determining exact settlement dates.
Frequently Asked Questions
What counts as a business day?
A business day is any day that is not a Saturday, Sunday, or a public holiday. The tool counts Monday through Friday by default, and optionally excludes public holidays from the count based on the selected holiday calendar (US Federal, UK Bank, EU Common, or custom).
Are start and end dates included in the count?
Yes. Both the start date and end date are included in the count. If the start and end dates are the same day and it is a business day, the result will be 1 business day.
How accurate are the built-in holiday calendars?
The US Federal calendar includes all 10 federal holidays with correct floating-date calculations (e.g., Thanksgiving on the 4th Thursday of November, MLK Day on the 3rd Monday of January). The UK Bank calendar includes standard bank holidays. The EU Common calendar includes holidays observed across most EU member states. For country-specific accuracy, use the Custom option to enter your exact holiday dates.
Can I calculate a deadline in business days?
Yes. Switch to the "Add Business Days" tab, enter your start date, and specify the number of business days. The tool will calculate the exact calendar date that is N business days in the future, skipping weekends and holidays. This is useful for SLA deadlines, payment terms (Net 30 business days), and legal notice periods.
What if my country's holidays are not listed?
Select the "Custom" holiday calendar option and enter your holiday dates manually in YYYY-MM-DD format, one per line. This allows you to use any combination of holidays specific to your country, state, religion, or organization.
Can I subtract business days from a date?
Yes. Switch to the "Subtract Business Days" tab, enter a date, and specify how many business days to go back. The tool will calculate the earlier date that is N business days before the given date, useful for determining when a process should have started to meet a deadline.
Why do holiday counts differ between my country and the built-in calendar?
Because public holidays are intensely regional — they vary by country, by state/province within a country, by religion, and even by year (some holidays float to different dates, and some are one-off). The built-in US Federal, UK Bank, and EU Common calendars cover the most widely-observed holidays for those regions, but they can't know your local or company-specific days off (regional holidays, religious observances, company shutdown weeks). If the count looks wrong, switch to the CUSTOM holiday option and enter your exact dates one per line in YYYY-MM-DD format. Also remember the tool only subtracts holidays that fall on a WEEKDAY — a holiday landing on a Saturday is already excluded as a weekend, so it doesn't reduce the count further.
What's the difference between 'Net 30 days' and '30 business days'?
Net 30 (calendar) days counts every day including weekends and holidays — 30 days from an invoice dated June 1 is July 1, full stop. 30 BUSINESS days counts only Monday–Friday excluding holidays, so 30 business days from June 1 lands in mid-July — roughly 6 calendar weeks, because each week contributes only 5 business days. The gap is significant: 30 business days is about 42 calendar days. This matters a lot for payment terms, SLAs, and legal notice periods — always confirm which one a contract means, because 'Net 30' almost always means calendar days while service-level agreements ('resolve within 5 business days') almost always mean working days.
Troubleshooting & Technical Tips
Common errors developers encounter and how to resolve them.
Result shows 0 business days
If both dates fall on the same weekend or holiday, or the date range contains only non-business days, the result will be 0. Expand the date range or check that your dates are correct.
Holiday count seems incorrect
The tool only counts holidays that fall on weekdays (Monday–Friday) within the selected date range. Holidays that fall on weekends are not counted because those days are already excluded as weekend days. Verify the date range includes the expected holidays by clicking "View holidays included" to see the full list.
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