What is a business days calculator?
A business days calculator counts working days between two dates. It excludes selected weekend days and optional holidays, making it useful for deadlines, invoices, shipping windows, contracts and project timelines.
What counts as a business day?
A business day is usually Monday to Friday, excluding Saturdays, Sundays and public holidays. Some businesses use different working patterns, so this calculator lets you choose which weekdays count as weekends.
How to calculate business days between dates
The calculator loops through each calendar date in the selected range, applies your start and end date inclusion rules, excludes selected weekend days, then subtracts holidays that fall on counted business days.
How weekends are excluded
By default, Saturday and Sunday are excluded. You can select a different weekend pattern if your business operates in a country or industry with non-standard working days.
How holidays affect business days
Holidays reduce the business day count only when they fall inside the selected date range and on a day that would otherwise be counted as a business day. A holiday on a weekend is already excluded as a weekend.
Business days vs calendar days
Calendar days include every day in the range. Business days exclude weekends and holidays. For example, Monday to Friday is 5 business days, Monday to the next Monday is 6 business days, and Saturday to Sunday is 0 business days.
Common uses for invoices, shipping, contracts, and deadlines
Business-day calculations are used for invoice payment terms, delivery estimates, contract notice periods, legal deadlines and project schedules. A weekday holiday reduces the count by 1 when it falls inside the selected range.