Date & Time
Workday Add Calculator (Add Business Days to Date)
Add a number of business days (skipping weekends) to a start date.
What this calculates
Need to know what date is 10 business days out? This calculator skips Saturdays and Sundays as it counts forward (or backward) from a starting date. Public holidays aren't included — adjust manually if needed.
Formula & how it works
Iterate from start, adding ±1 day at a time, only decrementing the counter on weekdays (Mon-Fri). Stop when counter reaches zero.
Worked example
Start Mon May 11, add 10 business days → Mon May 25 (skips two weekends).
Frequently asked questions
Negative days?
Counts backward — useful for 'what date was 10 business days ago'.
Public holidays?
Not included — holidays vary by country/region. Subtract them manually.
Use case?
Contract deadlines, project milestones, mailing delivery estimates, SLA windows.
Related calculators
- Business DaysCount business days (Mon-Fri) between two dates, or add a number of business days to a start date.
- Date Add / SubtractAdd or subtract any number of days, weeks, months, or years to a starting date. Returns the resulting date.
- Days BetweenCalculate exact days, weeks, months, and years between any two dates. Optionally exclude weekends to get business days.