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Business Days Calculator

Count weekdays between two calendar dates excluding weekends.

About Business Days Calculator

Contracts, legal filings, HR processes, and supply-chain commitments frequently specify timelines in business days rather than calendar days. The difference matters: a 10-business-day window that starts on a Thursday spans at least two calendar weeks once weekends are excluded, and far longer if public holidays fall within it. Manually counting forward on a wall calendar is error-prone, especially across month boundaries or when you need to account for regional holidays. This business days calculator solves both halves of the problem. In add mode, enter a start date and a number of business days and the tool returns the exact end date, skipping Saturdays, Sundays, and any holidays in your list. In count mode, enter two dates and it tells you how many business days lie between them.

Why use Business Days Calculator

Automatic Weekend Exclusion

Saturdays and Sundays are excluded from every calculation automatically. You never need to manually skip them when counting forward — the tool handles every week boundary correctly regardless of how many weeks the span crosses.

Holiday-aware Calculation

A country holiday preset fills in standard public holidays for major markets. Custom dates let you add company-specific shutdowns, regional bank holidays, or bridge days that the preset does not include.

Add or Count Mode

The calculator works in both directions: add N business days to a start date to find the deadline, or enter two dates to count how many working days fall between them. Both modes apply the same holiday and workweek rules.

Configurable Workweek

The standard workweek is Monday–Friday, but organisations in the Middle East use Sunday–Thursday, and some industries use a six-day week. You can toggle which days are working days to match your actual schedule.

Weekday Confirmation

The result date is always accompanied by the day-of-week name. This lets you immediately verify that a calculated delivery date or deadline does not fall on an unexpected non-working day that was missed in the settings.

On-device Privacy

Business dates often relate to sensitive contractual or employment matters. All calculation happens locally in the browser; no dates or holiday lists are ever sent to a server.

How to use Business Days Calculator

  1. Choose a mode: Add Business Days (to get an end date) or Count Business Days (between two dates)
  2. Enter the start date — and for count mode, the end date as well
  3. Select a country holiday preset from the dropdown or leave it blank for weekends-only exclusion
  4. Add any custom holiday dates for company shutdowns or regional observances not covered by the preset
  5. Adjust the workweek if your organisation does not use the standard Monday–Friday schedule
  6. Read the resulting end date and weekday, or the business-day count, and copy it for your records

When to use Business Days Calculator

  • When a contract specifies that payment or delivery is due within a set number of business days from signing
  • When calculating a legal filing deadline that must be received within a statutory number of working days
  • When HR needs to determine the end of a notice period or probationary period excluding non-working days
  • When supply-chain planning requires knowing the last working day before a production cutoff
  • When project management SLAs guarantee response or resolution within a defined number of business days
  • When counting working days between two dates to verify invoiced billable days or consultant time

Examples

Add 10 business days

Input: Start: 2026-05-07 (Thursday), Add: 10 business days

Output: Result: 2026-05-21 (Thursday)

Count between two dates

Input: Start: 2026-05-01, End: 2026-05-31 (US holidays)

Output: 21 business days (30 calendar days minus 8 weekend days, 1 Memorial Day)

Custom Sunday–Thursday workweek

Input: Workweek: Sun–Thu, Start: 2026-05-07, Add: 5 BD

Output: Result: 2026-05-14 (Thursday)

Tips

  • Verify high-stakes legal or immigration deadlines against an official calendar — always treat the result as a strong estimate to confirm manually
  • Most SLA contracts specify whether the start date counts as day one or day zero — clarify this before relying on the result
  • For Middle Eastern organisations using a Sunday–Thursday workweek, toggle the workweek settings explicitly to get correct results
  • Add company-specific shutdown days (factory holidays, bridge days) as custom holidays to get accurate inter-office delivery estimates
  • Bookmark the tool URL after configuring your country preset and custom holidays so the settings persist between sessions

Frequently Asked Questions

What counts as a business day?▾
A business day is any weekday (Monday through Friday by default) that is not designated as a public holiday. The exact definition can vary by jurisdiction and contract, but the calculator's default matches the most common international standard.
Are public holidays included automatically?▾
Not by default — the base calculation skips only weekends. To include public holidays, select a country preset from the dropdown or manually enter specific holiday dates. This keeps the tool accurate for any country or company calendar.
How do I enter a custom holiday list?▾
Use the custom holidays input to add individual dates in YYYY-MM-DD format. These are added on top of any country preset you select, so you can combine a standard national holiday list with company-specific closure days.
Does this support workweeks other than Saturday–Sunday weekend?▾
Yes. The workweek configuration lets you toggle each day of the week as working or non-working. Sunday–Thursday is a common preset for Middle Eastern markets; six-day weeks can also be configured.
How are half-day holidays handled?▾
The calculator works at the whole-day level and treats a day as either fully working or fully non-working. For half-day holidays, you can add a note or adjust your count by 0.5 manually after getting the result.
What if my country uses a Sunday–Thursday workweek?▾
Toggle the workweek settings to mark Sunday through Thursday as working days and Friday and Saturday as non-working days. The calculator will then exclude Fridays and Saturdays instead of Saturdays and Sundays.
Is the start date counted as day one or day zero?▾
By default, the start date is day zero and the first business day added is the following working day. This matches the most common SLA convention, where 'within 5 business days' means by the end of the fifth working day after the triggering event.
What is the difference between this and the date-diff tool?▾
Date-diff counts all calendar days between two dates, including weekends and holidays. Business days calculator counts only working days, applying your configured weekend and holiday exclusions. Use this tool whenever an SLA or contract uses working-day language.

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Glossary

Business Day
A day on which normal business operations occur, typically Monday through Friday excluding public holidays. The exact definition can vary by country, industry, and contractual agreement.
Working Day
Synonymous with business day in most contexts, though some jurisdictions distinguish them. Working day often refers to any day an employee is expected to work, which can include Saturdays in certain industries.
Bank Holiday / Public Holiday
A government-designated day on which banks and most businesses are closed. Public holidays vary by country and region and must be explicitly excluded from business-day calculations to get accurate results.
Workweek
The set of days in a calendar week that are considered working days. The standard in most of the world is Monday–Friday, but Sunday–Thursday is common in the Middle East and other regional variations exist.
Calendar Day vs Working Day
A calendar day counts every day from midnight to midnight regardless of whether it is a weekend or holiday. A working day counts only days on which business is conducted. The gap between the two grows with weekends and holidays.
SLA (Service Level Agreement)
A contractual commitment defining the maximum time allowed to complete a service or respond to a request. SLAs frequently specify durations in business days, making accurate working-day calculation essential for compliance.