The Add Business Days calculator finds the date that falls a given number of working days before or after a start date, automatically skipping weekends. It is built for the everyday questions that calendar arithmetic gets wrong: when a 30-day notice period ends in working days, when a payment is due, or when a parcel quoted in business days should arrive.
How it works
Starting from your chosen date, the tool steps one calendar day at a time toward the target. Each day is checked: if it lands on a weekend (Saturday or Sunday by default) it is skipped and does not reduce the remaining count. Only working days decrement the counter, so the result always lands on a business day. Enter a negative number to count backwards. If your week differs, you can toggle Saturday or Sunday to count as working days. Public holidays are not included — adjust for those manually.
Example
Start date: Thursday, 1 January 2026. Add 10 business days.
Counting forward and skipping the weekends of 3–4 January and 10–11 January, the 10th working day lands on Thursday, 15 January 2026.
| Input | Value |
|---|---|
| Start date | Thu 1 Jan 2026 |
| Business days to add | 10 |
| Weekends skipped | Sat & Sun |
| Result | Thu 15 Jan 2026 |
Everything runs entirely in your browser — no dates are uploaded.