Why might the two results ever match?

If the duration and start date never actually cross a non-working day, both counting rules end up producing the exact same date.

Does the gap between the two results always grow with a longer duration?

Generally yes, since a longer duration crosses more weekends, but the exact size of the gap for any specific case depends on which weekdays the start and end points happen to land on.

Calendar vs Business Deadline Comparator

Enter one start date and one duration number, and see both counting rules applied independently, side by side. Neither is chosen for you.

Already know which rule you need? Solve it directly with Deadline Planner.

Worked example

From Monday, January 4, 2027, a stated "plus 10" means January 14 under calendar days, but January 18 under a Monday-through-Friday business-day calendar, a 4-day gap caused entirely by the two weekends the business-day rule has to skip past. Shift the same start date to a Wednesday instead, and the gap narrows to 4 days again but lands on different specific dates, since the exact weekdays crossed determine how many weekend days fall inside the span.

Common mistakes

Assuming a deadline stated as a plain number, like "net 10," always means the same 10 days regardless of which counting rule the other party actually intended.
Picking whichever result looks more convenient rather than confirming which rule the actual agreement or policy specifies.

Limitations

This shows two independent alternatives side by side. It does not decide which one applies to a specific agreement or policy, so that determination still needs to come from the actual contract or rule in question.

Frequently asked questions

Why might the two results ever match?: If the duration and start date never actually cross a non-working day, both counting rules end up producing the exact same date.
Does the gap between the two results always grow with a longer duration?: Generally yes, since a longer duration crosses more weekends, but the exact size of the gap for any specific case depends on which weekdays the start and end points happen to land on.