Add Business Days Calculator (Date After N Working Days)
Enter a start date and a number of working days to find the due date.
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Add Business Days Calculator (Date After N Working Days) by TheCalcTools
How the Add Business Days Calculator (Date After N Working Days) works
Business days are Monday to Friday. The count starts on the next business day after the start date, so 1 business day after a Friday is the following Monday.
Public holidays are not known for every country, so enter how many fall on weekdays in the period and the calculator extends the date by that many business days.
The formula
Worked example
Using the default values shown in the calculator:
| Start date | 2026-10-16 |
|---|---|
| Business days to add | 10 |
| Public holidays falling in the period | 0 |
- 10 business days after Friday 16 October 2026 is Friday, 30 October 2026.
- That spans 14 calendar days, skipping 4 weekend days.
Result:
| Due date | Friday, 30 October 2026 |
|---|---|
| Calendar days from the start date | 14 |
| Weekend days skipped | 4 |
| Due date (ISO) | 2026-10-30 |
Frequently asked questions
Does it count the start date?
No. Day 1 is the first business day after the start date, the usual convention for delivery times and legal deadlines.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.