Count business days between two dates, or add/subtract business days from a date. Supports US, UK, and EU holiday calendars plus custom holidays.
Add custom holiday dates (one per line, YYYY-MM-DD format):
Business Days
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.
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.
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.
Essential terms and definitions related to Business Days Calculator.
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.
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.
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.
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.
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).
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.
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.
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.
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.
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.
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.