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Date & Time
Business Days Calculator — Working Days Between Two Dates
Count working days between dates or add business days, skipping weekends and holidays
A business days calculator counts only the working days — Monday through Friday — between two dates, leaving out Saturdays and Sundays (and any holidays you tell it to skip). That is the number Americans actually care about when a contract promises delivery "within 10 business days," when HR measures a notice period, when a bank quotes a check-clearing window, or when a court sets a filing deadline. A plain calendar-day count overstates how long things really take, because roughly two out of every seven days aren't workdays at all.
The math is simple in principle: walk from the start date to the end date and tally every day that falls on Mon–Fri. This tool offers two modes. Count business days tells you how many working days lie between a start and an end date. Add business days does the reverse — give it a start date and a number of working days, and it lands on the date that many workdays later, automatically hopping over weekends.
The part that trips people up is inclusive vs. exclusive counting. If you start a project on Monday and it's due Friday of the same week, is that 4 business days or 5? It depends on whether you count the start day itself. By default this calculator counts both endpoints — every weekday from the start date through the end date, inclusive — which is how most "business days between two dates" questions are meant. Mon Jun 1, 2026 to Fri Jun 12, 2026 returns 10 business days: those two work weeks are counted in full and the Saturday and Sunday inside the span are excluded. If you instead want elapsed business days after the start (the reading some shippers use), set "count the start date" to No and the start day is dropped.
Holidays are the second wrinkle. Federal holidays like New Year's Day, Independence Day, Labor Day, Thanksgiving and Christmas usually fall on a weekday, so a "5 business days" promise can quietly stretch when one lands in the window. Enter the number of holidays inside your date range and they're subtracted from the working-day total.
Keep in mind this is general scheduling guidance, not legal advice: courts, agencies and contracts each define "business day" their own way. Use it to plan deadlines, estimate delivery, or sanity-check a "within X business days" promise — then confirm the exact rule for anything with legal weight.
Need only a plain weekday count between two dates with no holiday list? The Date Difference Calculator shows that alongside total days — this tool is built for the two jobs it does not: excluding specific holidays and adding a number of business days forward from a date.
📖 See also: How to Calculate a Tip (and Split the Bill)
Calculator
Fill in the fields and click "Calculate" for instant results.
📰 Formula
• Business days = count of every date from start to end that falls on Mon–Fri • Weekends (Saturday, Sunday) are always excluded • Optional: subtract the number of holidays that fall on weekdays inside the range • Default count is inclusive of both endpoints (the start and end dates are both counted); set "count the start date" to No for elapsed business days after the start • Add mode: step forward from the start, counting only Mon–Fri, until N business days have passed
📰 Formula
• Business days = count of every date from start to end that falls on Mon–Fri • Weekends (Saturday, Sunday) are always excluded • Optional: subtract the number of holidays that fall on weekdays inside the range • Default count is inclusive of both endpoints (the start and end dates are both counted); set "count the start date" to No for elapsed business days after the start • Add mode: step forward from the start, counting only Mon–Fri, until N business days have passed
🧪 Worked examples
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Example 2
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Example 3
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Example 4
⚠️ Common mistakes
- Confusing business days with calendar days — a 10-business-day window is about 14 calendar days.
- Forgetting holidays: a federal holiday on a weekday adds a day to delivery or processing.
- Mixing up inclusive and exclusive counting (whether the start date itself counts).
- Assuming Saturday is a business day — standard US business days are Monday through Friday only.
- Entering a holiday that actually falls on a weekend (it shouldn't be subtracted).
💡 Tips
- For elapsed shipping or bank timelines where the start day doesn't count, set "count the start date" to No.
- Only subtract holidays that land on a weekday inside your range; weekend holidays are already excluded.
- Ten business days is two full work weeks — a quick mental check for the 10-day promise.
- When a deadline says "by" a date, the end date itself is normally included.
- If a contract or court rule defines business days differently, follow that definition over the default.
Embed this calculator on your site
Copy the code below and paste it into the HTML of your site or blog.
<iframe src="https://www.calcnimbus.com/embed/business-days-calculator" width="100%" height="500" frameborder="0" style="border:1px solid #eee;border-radius:12px"></iframe>
❓ Frequently asked questions
How many business days are between two dates?
Count every Monday-through-Friday date in the range and skip Saturdays and Sundays. From Mon Jun 1, 2026 to Fri Jun 12, 2026 there are 10 business days, because the two weekends (4 days) are excluded.
What counts as a business day in the US?
A business day is any weekday — Monday through Friday — that is not a recognized holiday. Saturdays, Sundays and federal holidays are not business days for most banks, shippers and offices.
How long is 10 business days in calendar days?
Usually 14 calendar days (two full weeks), because each week of 5 business days includes a 2-day weekend. If a federal holiday falls in the window, the calendar span stretches by another day.
Does the calculator subtract holidays automatically?
It subtracts the number of holidays you enter. Federal holidays vary by year and by state, so you tell it how many weekday holidays fall inside your date range and they're removed from the total.
Is the start date included in the business-day count?
By default yes — the calculator counts both the start and end dates, the usual reading for 'business days between two dates.' Set 'count the start date' to No if you want elapsed business days after the start, as some shippers measure.
How do I add 5 business days to a date?
Switch to "add business days," enter your start date and 5. The tool steps forward one weekday at a time, skipping Saturday and Sunday, and shows the date 5 working days later.
Are weekends ever counted as business days?
Not in the standard US convention. Some industries treat Saturday as a half or full working day, but banks, courts and most carriers count only Monday through Friday.
How many business days are in a typical month?
Most US months have 20 to 23 business days, depending on how the weekends fall and whether any federal holidays land on a weekday that month.
Why does my delivery take longer than the business days quoted?
Weekends and holidays inside the window don't count, so 5 business days can span a full week or more on the calendar. A holiday landing mid-window pushes the calendar date out by an extra day.