Excel Add Weekdays

What this does

WORKDAY returns the date a given number of working days from a start date, skipping Saturdays, Sundays and any holidays you list. It is the counterpart to NETWORKDAYS, which counts the days between two dates rather than projecting forward. The holidays argument is what makes it trustworthy in practice: without a holiday range it will happily land a deadline on Christmas Day. Its sibling WORKDAY.INTL takes a weekend-pattern argument, which matters for regions where the weekend is not Saturday and Sunday. Keep the inputs visible and clearly labelled and the whole thing stays auditable — anyone who opens the file later, including you, can see at a glance exactly what feeds the result and change one assumption without hunting through the formula. Treat “excel add weekdays” as a small repeatable workflow rather than a one-off click you hope to remember next time. Use a small test block before the live file, so any surprise in the affected cells shows up while it is still harmless. When a formula is involved, keep the inputs labelled beside it, reference cells instead of typing values, and apply number formatting only after the result checks out. That turns a calculation you can defend to a CFO or an auditor into a method you can reuse, explain, and defend when the workbook leaves your screen.

A worked example

A ten-working-day SLA from a ticket date, with public holidays listed in H2:H20: =WORKDAY(A2, 10, $H$2:$H$20). Counting backwards to find when work must start: =WORKDAY(deadline, -5, $H$2:$H$20). A Friday-Saturday weekend: =WORKDAY.INTL(A2, 10, 7, $H$2:$H$20). WORKDAY turns an SLA or lead time into a real calendar date, which is the number a customer actually gets told. If there is any chance you will reuse this, drop it into a small template tab right now: a labelled input area on the left and the formula beside it, checked once against the tool above. Next time the same question comes up, the answer is a single paste away instead of a rebuild from memory.

In Google Sheets

Google Sheets handles this almost identically to Excel. The formula syntax above is the same, and the menu lives under a slightly different label rather than a ribbon tab. Use the platform toggle at the top of the page to switch every keyboard shortcut between Windows and Mac, and expect at most cosmetic differences in naming. Nothing on this page is behind a login: the tool runs entirely in your browser, the formula is shown in full with one-click copy, and the steps work the same on Windows and Mac. That is the whole promise here — the exact answer, a way to prove it on your own numbers, and just enough context to make it stick. Treat “excel add weekdays” as a small building block rather than a chore. Once the inputs sit in their own cells and the formula reads from them, the same setup answers a dozen related questions with a tweak, and Excel keeps every dependent figure current as the data changes. The tool above is there so you can rehearse and verify before committing anything to a real workbook; the steps and worked example are there so the logic sticks. Get it right once and it stops costing you time — it starts saving it, every time the question comes back around.

Common mistakes

• Omitting the holidays range, which lets a deadline land on a public holiday.
• Forgetting to anchor the holiday range before filling down, so later rows check a shrinking list.
• Expecting the start date to count as day one; it does not — counting begins the following working day.

Frequently asked questions