How bizdaycalc counts working days and which calendars are currently covered.
bizdaycalc currently supports the United Kingdom, Ireland, and United States with listed public holidays for 2026 and 2027.
Working days are counted as Monday to Friday. When public holiday exclusion is enabled, listed public holidays for the selected country are excluded from the working-day total. The calculator moves through the calendar day by day, skips Saturdays and Sundays, and then checks whether the remaining weekday is included in the selected public holiday list.
The UK calendar is intended for general business planning and uses the listed bank holidays available in the tool. Ireland uses listed public holidays relevant to common business planning. The United States option uses federal holidays. These calendars are useful for estimates, operational planning, invoice terms, delivery promises, support SLAs, and internal target dates.
Some industries and locations use rules that are more specific than a general business-day calendar. Scotland and Northern Ireland can differ from England and Wales for certain holidays. US state holidays, local court closures, company shutdown days, emergency closures, and sector-specific rules are not automatically included unless they appear in the selected public holiday list.
For low-risk planning, the calculator gives a fast and consistent answer. For legal, contractual, payroll, tax, court, complaint, or regulated deadlines, use the result as a starting point and then check the official rule, contract wording, regulator guidance, or professional advice. Pay attention to whether the start date counts, whether the end date counts, and whether a cut-off time changes the effective received date.
Use this site as a planning aid. Legal, contractual, payroll, tax, court, complaint, or regulated deadlines can have special rules, cut-off times, local calendars, and exceptions. Always verify important deadlines against the official rule or professional advice.