Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Project a deadline date from a start date and a business-day duration.
2026-01-22
This calculator projects a deadline date from a start date and a stated number of business days allowed for the work -- automatically skipping weekends, so a "10 business day" turnaround correctly lands on a weekday two calendar weeks (plus a bit) out, not a raw 10-calendar-day addition.
Enter a start date and the number of business days allowed. The result shows the resulting deadline date and its day of the week.
Starting from the day after the start date, the calculator steps forward one calendar day at a time, only counting weekdays toward the total, until the requested number of business days has elapsed.
1 business day from Friday, January 9, 2026 lands on Monday, January 12, 2026.
For counting business days between two already-known dates instead, use the Business Days Calculator. This tool shares its business-day-stepping logic with the Add Business Days Calculator.
Start on Wednesday, March 4, 2026 with 5 business days allowed. Counting from the day after the start: Thursday is 1, Friday is 2, Monday is 3, Tuesday is 4, Wednesday is 5. The deadline lands on Wednesday, March 11, 2026, which is 7 calendar days later. Try 10 business days from the same start and the result is Wednesday, March 18. These dates are examples only, and the pattern is that every 5 business days advances the date by exactly one week.
The start date itself is not counted. The tool begins at the following day, so a request received on Monday with a 1 business day turnaround is due Tuesday. This matches a common convention, but some contracts count the day of receipt as day one, or say "within 5 business days after receipt" while excluding receipt time after a cutoff hour. If your agreement has a cutoff such as 5 p.m., a request submitted after the cutoff is often treated as received the next business day, so enter the next business day as the start date in that case.
If the start date falls on a Saturday or Sunday, the tool still moves forward day by day and counts only weekdays, so the first business day counted is the following Monday. A start date of Saturday with 1 business day therefore gives Monday. That may differ from a policy that treats weekend requests as received Monday, which would give Tuesday. Adjust the start date to match your policy.
Only weekends are skipped. Public holidays, company closures and regional holidays are not removed, so if one falls in the range, add another business day for each. For legal, regulatory or contract deadlines, such as court filings, tax filings or statutory response windows, the counting rules are specified by the governing document or agency and may include weekends, holidays and cutoff times. Check the official rules rather than relying on this tool, and consult a professional if a missed date would have serious consequences.
The tool only counts forward. To find when work must start to meet a fixed deadline, test a few candidate start dates until the result matches, or count back by hand skipping weekends. Add a buffer of a day or two for review and revisions when the deadline is a client deliverable.
No -- like the other business-day tools in this category, it skips weekends only; subtract known holidays manually if your deadline needs to account for them.
They perform the same underlying calculation -- this one is framed specifically around project/task deadlines, while the other is a more general-purpose date tool.
Yes -- that returns the start date itself (assuming it's a weekday), for same-day deadline scenarios.
No. Counting begins on the day after the start date, so 1 business day from a Monday is Tuesday.
The tool counts only weekdays going forward, so 1 business day from a Saturday gives Monday. Adjust the start date if your policy treats weekend requests differently.
The number is rounded to the nearest whole business day before counting.
Add one business day to the allowance for each holiday that falls on a weekday within the period, since the tool skips weekends only.
Reference: U.S. Department of Labor