Project Deadline Countdown Calculator
Compute a project due date by adding N working days to a start date, skipping weekends and US federal holidays automatically.
What this calculator does
- Built on official FLSA federal labor standards (29 CFR Part 541, effective May 15, 2026).
- Results include a plain-English interpretation of what the numbers mean for your situation.
- All math happens locally — your data never leaves your device.
Deadline Inputs
Projected Due Date
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How this calculation works
A project deadline in "business days" excludes weekends and federal holidays.
Counting starts on the business day after your start date.
How this Project Deadline Countdown Calculator works — 2026 guide
When a client says "15 business days," they mean 15 working days — weekends and federal holidays don't count. This project deadline calculator adds N working days to a start date, skipping Saturdays, Sundays, and the 11 federal holidays observed in 2026, so a Monday + 5 work days lands on the following Monday, not the weekend. It is the same math project managers use in every US schedule tool, without the spreadsheet.
How to use it in 3 steps
- Enter your start date.
- Enter the number of working days to add (or a target date to count backward).
- Read the resulting deadline, with each skipped holiday listed so the logic is transparent.
Who this is for
Freelancers quoting delivery dates, PMs building schedules, and anyone signing a contract with "business days" in it. Read the [how to estimate a project deadline guide](/blog/how-to-estimate-project-deadline/), the [deadline excluding weekends guide](/blog/how-to-calculate-a-project-deadline-excluding-weekends/), and the [work day counter](/tools/work-day-counter/) for count-between-dates questions.
Data sources & authoritative references
This calculator is built on official U.S. rules and published statistics. Key sources:
Frequently Asked Questions
How are weekends and holidays handled?
Does the start day count as a work day?
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Data sources & methodology
- Standard formulas Amortization, compound interest, and retirement projection equations per finance practice.
- Public reference rates Savings/investment assumptions stated as planning estimates; no live market rates.
- Internal editorial Calculators reviewed by the AllMoneyCalc editorial team before publication.
Methodology and citations are maintained by the AllMoneyCalc editorial team. Where an official schedule is not yet loaded, results are shown as model estimates and the source is stated as a reference.