Business Days Calculator
Calculate business days between two dates.
How to use Business Days Calculator
Enter Your Start Date
Click the 'Start Date' field and select or type the beginning date. The calendar picker shows on the left side—navigate months using arrow buttons or type directly in MM/DD/YYYY format.
Enter Your End Date
Click the 'End Date' field below and select the ending date using the same calendar picker. Both dates must be filled before calculation runs.
Exclude Holidays (Optional)
Check the 'Exclude Holidays' checkbox to remove standard US holidays from the count. Click 'Add Holiday' button to manually add custom dates you want excluded from business days.
View Your Results
The results display instantly below the input fields showing: Total Days, Business Days (Monday-Friday), Weekend Days, and Holidays Excluded. Results update automatically as you change dates.
Copy or Download Results
Click the 'Copy' button to copy results to clipboard, or select 'Download as CSV' to export the calculation with detailed breakdown for your records.
Related Tools
Business days calculator: count working days between dates
Business days calculator: count working days between dates
Need to know how many business days remain until a deadline, or what date falls 15 working days from today? Use the free business days calculator on ToolHQ to count working days between two dates, excluding weekends and optionally excluding holidays.
A business days calculator counts only Monday through Friday when calculating a span of time, skipping Saturday and Sunday (and public holidays when specified). The result is the number of actual working days, not calendar days.
This distinction matters in legal, financial, and professional contexts where "30 business days" means something very different from "30 calendar days." A 30-calendar-day window from January 1 ends January 31. A 30-business-day window from the same start date ends February 12, accounting for the weekends in between. Getting this wrong can mean missing payment deadlines, legal notice periods, or compliance windows.
Key Takeaways
- Business days = weekdays only (Monday to Friday), excluding weekends and public holidays
- 30 business days is approximately 6 calendar weeks; 50 business days is about 10 calendar weeks
- The US has approximately 250 working days per year (365 minus weekends minus 11 federal holidays)
- "Net 30" invoicing means payment is due 30 calendar days from invoice date, but some contracts specify business days
- No data is stored or transmitted, all calculations run in your browser
Why business days differ from calendar days
Calendar days include every day of the week: Monday through Sunday. Business days include only Monday through Friday, skipping weekends. When you also exclude public holidays, the gap widens further.
A simple example: a 20-business-day project that starts on a Monday spans exactly four calendar weeks (20 weekdays across four Monday-Friday blocks). But if any of those weeks contain a public holiday, the actual calendar span extends by one additional day per holiday.
According to Wikipedia's workweek and weekend article, the Monday-to-Friday workweek is standard across most of North America, Europe, and Australia, though some regions use a Sunday-to-Thursday workweek (common in Middle Eastern countries) or other variations.
The key time conversions to keep in mind:
| Business day window | Approximate calendar time | Equivalent calendar weeks |
|---|---|---|
| 5 business days | ~7 calendar days | ~1 week |
| 10 business days | ~14 calendar days | ~2 weeks |
| 15 business days | ~21 calendar days | ~3 weeks |
| 20 business days | ~28 calendar days | ~4 weeks |
| 30 business days | ~42 calendar days | ~6 weeks |
| 45 business days | ~63 calendar days | ~9 weeks |
| 60 business days | ~84 calendar days | ~12 weeks |
The exact calendar date will vary depending on which specific days are weekends within your window and whether any holidays fall in that period.
When you need a business days calculator
Project and contract deadlines. A statement of work gives you "45 business days to deliver." Starting on a Monday, that deadline falls about 9 weeks and 3 days later in calendar time.
Invoice payment terms. "Net 30" typically means 30 calendar days from invoice date. But some contracts, especially in government and legal contexts, specify "30 business days," which is nearly two calendar months. The difference can significantly affect cash flow planning.
Legal notice periods. Legal processes often specify notice periods in business days. A "5 business day" right-to-cure notice in a lease means the tenant has one calendar week, not five days. A "10 business day" protest period in a contract dispute is two full calendar weeks.
Payroll and HR timelines. Many HR processes (background checks, onboarding paperwork, leave approvals) have business-day turnaround times. Calculating the exact calendar date prevents scheduling confusion.
Shipping and delivery. "Ships within 7 business days" from a Monday order means delivery by the following Wednesday, not the following Monday.
Take Sandra, a procurement manager at a mid-size manufacturing company. She received a supplier invoice with Net 30 payment terms dated March 1. She assumed the due date was March 31. Her finance team processed payment on April 2 and the supplier charged a late fee. When she re-read the contract, it said "30 business days," not "30 calendar days." Thirty business days from March 1 (starting the count on March 2) fell on April 10. She had paid early, not late. She documented the correct date using the business days calculator and updated her team's accounting workflow to always verify whether payment terms specified calendar or business days.
How to use the ToolHQ business days calculator
The calculator offers two modes.
Count business days between two dates:
- Enter your start date.
- Enter your end date.
- Choose whether to exclude weekends only, or weekends plus public holidays.
- The calculator shows the total number of business days between the two dates.
Find a date N business days from a start date:
- Enter your start date.
- Enter the number of business days to add (or subtract).
- Choose your holiday preference.
- The resulting business date appears instantly.
No data is stored or transmitted. All calculations run in your browser.
The date calculator handles calendar-day calculations when you need the full date including weekends. The countdown timer lets you count down to a deadline in real time once you know the exact date.
Working days in a year and common business day scenarios
Working days in a year
In the United States, a standard calendar year contains approximately 250-252 working days, depending on how weekends align. The exact count:
- 365 days per year
- Minus 104 weekend days (52 Saturdays + 52 Sundays)
- Minus approximately 11 federal holidays
- Total: approximately 250 business days
2026 has 250 business days in the US after accounting for federal holidays.
Common Net payment term deadlines
| Payment terms | Calendar days | Business days | Notes |
|---|---|---|---|
| Net 7 | 7 days | 7 days (usually calendar) | Short-cycle invoicing |
| Net 15 | 15 days | 15 days (usually calendar) | Semi-monthly billing |
| Net 30 | 30 days | ~42 calendar days if specified as business | Most common invoice term |
| Net 45 | 45 days | ~63 calendar days if specified as business | Extended terms |
| Net 60 | 60 days | ~84 calendar days if specified as business | Large supplier agreements |
| Net 90 | 90 days | ~126 calendar days if specified as business | Government/enterprise |
Always check your contract: "30 days" and "30 business days" have entirely different deadlines.
James was a freelance developer who sent invoices with Net 30 terms. A client's accounts payable team kept paying on day 40-45. When he called, they said "Net 30 business days is our policy." James had not specified in his contract, so he had no recourse. He updated his invoice template to explicitly say "Net 30 calendar days from invoice date" and the late payments stopped. The business days calculator helped him figure out the corresponding calendar deadline for each invoice at a glance.
For related tools, the age calculator calculates exact age in years, months, and days from a birth date, and the countdown timer helps you visualize how much time remains until a business deadline.
Frequently asked questions
What counts as a business day?
A business day is any weekday (Monday through Friday) that is not a public holiday. In the US, the 11 federal holidays (New Year's Day, MLK Day, Presidents Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, Christmas) are typically excluded.
Is "Net 30" calendar days or business days?
By default, "Net 30" in most business contexts means 30 calendar days from the invoice date. However, some contracts, particularly in government contracting and legal matters, specify "30 business days." Always check your contract's exact wording.
How many business days are in a year?
In the US, approximately 250-252 business days per year, depending on how weekends fall and the exact holiday calendar. 2026 has approximately 250 business days.
Can I calculate business days excluding specific holidays?
Yes. The business days calculator lets you choose to exclude standard country holiday sets. For custom holidays specific to your organization, subtract them manually from the result.
What is the difference between 5 business days and 1 week?
Five business days is Monday through Friday. One week is 7 calendar days. If you start on a Wednesday, 5 business days lands on the following Tuesday. Seven calendar days lands on the following Wednesday.
The short version
Business days and calendar days are not the same, and using the wrong one can mean missing deadlines, paying invoices late, or misunderstanding contract terms. ToolHQ's business days calculator counts only working weekdays, excludes weekends automatically, and optionally excludes public holidays.
Whether you are calculating a project deadline, an invoice due date, or a legal notice period, knowing the exact working-day count prevents the kind of miscalculation that has real consequences.
Use the free business days calculator now
For calendar-day calculations (including weekends), use the date calculator. For counting down to a deadline in real time, try the countdown timer.