Working Hours + Business Days Combo
Total business days AND business hours between two timestamps.
These calculators are for informational purposes only and do not constitute legal, financial, or professional advice.
How the Working Hours + Business Days Combo works
The Working Hours + Business Days Combo takes two dates and counts the working days between them, then breaks the span into its parts: the business-day total, the full calendar span, the weekend days removed, and the holiday days removed. That breakdown is the point — a bare "twelve business days" is easy to distrust, but "eighteen calendar days, minus four weekends, minus two holidays" is auditable, because every day that dropped out maps back to something concrete.
Starting from a clean business-day count is what lets you convert to working hours honestly: multiply the days by the length of your working day, so twelve business days at eight hours is 96 working hours. Anchoring the hours figure to the business-day count keeps both numbers describing the same real, workable time — the same reason SLAs are written in business hours rather than calendar hours, which would charge you for nights, weekends, and holidays nobody was going to work. Read both off one span with one holiday calendar and a capacity plan built on the hours cannot drift from a deadline built on the days.
As with any span calculation, whether the first and last day count is a genuine decision. Measuring a task from its start through its due date may call for both endpoints in; measuring the gap between two events may call for neither. The tool toggles each endpoint independently, and on a short span a single off-by-one day is a meaningful fraction of the total — the difference between an estimate that lands and one that is a day over.
Worked example
Take a project window from Monday, July 6 through Friday, July 24. The raw span is 19 calendar days. Strip out three weekends — six days — and the working count is already down to 13; drop one public holiday inside the window and it falls to 12 business days, or 96 working hours at an eight-hour day. Quote a client "about three weeks" and you have described 19 days; plan the work against 12 and you have described what the team can actually do. Same span, two very different numbers — and only one is safe to promise against.
Frequently asked questions
Does the calculator return business hours as well as business days?
It returns the business-day count and the full breakdown — calendar days, weekend days, and holiday days. To express that as working hours, multiply the business days by your own working-day length (eight hours, 7.5, whatever your team uses). Anchoring the hours to the counted business days keeps both figures describing the same workable time rather than drifting apart.
Why not just count calendar days and multiply by 24?
Because calendar hours include nights, weekends, and holidays no one works, so they overstate real capacity badly. Measuring in business days first — then converting to hours — is why service-level agreements are written in business hours: it ties the number to time work can actually happen in, which is the only figure safe to plan or promise against.
How do the endpoint toggles change the result?
They decide whether the start date and the end date each count toward the span. Include both when you are measuring a task that runs from its start through its due date; exclude them when you are measuring the gap between two separate events. On a short window that single day is a real slice of the total, so set the toggles to match what the span represents before you rely on the number.
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