Business Days Explained: Working Days vs Calendar Days
Understanding the difference between business days and calendar days is essential for contracts, shipping, legal deadlines, and financial transactions. This comprehensive guide explains what counts as a business day, how to calculate them, and why the distinction matters in everyday life.
- Business days = Monday through Friday, excluding federal holidays
- Calendar days = All days including weekends and holidays (7 per week)
- ~251 business days per year in the US (vs 365 calendar days)
- 30 business days = approximately 42 calendar days (6 weeks)
- 5 business days = 1 calendar week (7 days)
- Use our business days calculator for accurate counts
What is a Business Day?
A business day (also called a working day) is any day that is not a weekend or public holiday. In the United States, this typically means:
- Included: Monday, Tuesday, Wednesday, Thursday, Friday
- Excluded: Saturday, Sunday, and federal holidays
According to the Legal Information Institute, business days are formally defined by statute in many legal contexts. The concept is crucial for understanding timelines in contracts, shipping, banking, and legal proceedings.
The term "working days" is used interchangeably with "business days" in most contexts. Some industries may have specific definitions, so it's always important to clarify when exact timing matters.
Business Days vs Calendar Days Comparison
Understanding the difference between these two types of day counts is essential for accurate planning:
| Aspect | Calendar Days | Business Days |
|---|---|---|
| Days per week | 7 | 5 |
| Days per year | 365-366 | ~251-252 |
| Includes weekends | Yes | No |
| Includes holidays | Yes | No |
| 30-day period | ~4.3 weeks | ~6 weeks |
| 90-day period | ~13 weeks | ~18 weeks |
| Common uses | Age, rental periods, general dates | Shipping, legal, contracts, banking |
Common Business Day Calculations
Use this quick reference table to convert between business days and calendar days:
| Business Days | Calendar Days | Weeks | Common Uses |
|---|---|---|---|
| 1 | 1-3 | — | Next-day shipping, urgent deadlines |
| 3 | 3-5 | ~0.5 | Standard shipping, quick responses |
| 5 | 7 | 1 | Standard business shipping |
| 7 | 9-11 | 1.5 | Extended processing time |
| 10 | 14 | 2 | Standard response periods |
| 15 | 21 | 3 | Extended processing |
| 20 | 28 | 4 | Monthly business period |
| 30 | 42 | 6 | Net 30 payment terms |
| 45 | 63 | 9 | Extended contract periods |
| 60 | 84 | 12 | Net 60 payment terms |
| 90 | 126 | 18 | Quarterly business period |
Note: These are approximations. Actual calendar days may vary slightly depending on which day of the week you start and whether any federal holidays fall within the period.
US Federal Holidays 2026
These 11 federal holidays are excluded from business day calculations. According to the Office of Personnel Management (OPM):
| Holiday | 2026 Date | Day of Week |
|---|---|---|
| New Year's Day | January 1 | Thursday |
| Martin Luther King Jr. Day | January 19 | Monday |
| Presidents' Day | February 16 | Monday |
| Memorial Day | May 25 | Monday |
| Juneteenth | June 19 | Friday |
| Independence Day | July 4 (observed July 3) | Saturday |
| Labor Day | September 7 | Monday |
| Columbus Day | October 12 | Monday |
| Veterans Day | November 11 | Wednesday |
| Thanksgiving Day | November 26 | Thursday |
| Christmas Day | December 25 | Friday |
Weekend rule: When a federal holiday falls on a Saturday, the preceding Friday is observed. When it falls on a Sunday, the following Monday is observed.
Business Days Per Month (2026)
The number of business days varies by month due to the number of weekends and holidays:
| Month | Business Days | Federal Holidays |
|---|---|---|
| January | 20 | New Year's Day, MLK Day |
| February | 19 | Presidents' Day |
| March | 22 | None |
| April | 22 | None |
| May | 20 | Memorial Day |
| June | 21 | Juneteenth |
| July | 22 | Independence Day (observed) |
| August | 21 | None |
| September | 21 | Labor Day |
| October | 21 | Columbus Day |
| November | 19 | Veterans Day, Thanksgiving |
| December | 22 | Christmas Day |
| Total 2026 | 250 | 11 holidays |
When Business Days Matter
Shipping & Delivery
Most shipping carriers use business days for delivery estimates:
- "Ships in 3-5 business days" = approximately 1 week calendar time
- USPS, UPS, FedEx don't typically deliver on Sundays (some services excepted)
- International shipping may use destination country holidays
- Orders placed after cutoff time count toward the next business day
Legal Deadlines
Legal proceedings often specify deadlines in business days:
- Court filing deadlines typically count business days
- Response periods in contracts and legal notices
- Statute of limitations may use calendar or business days
- SEC filing requirements use business days
Financial Transactions
Banking and financial services operate on business days:
- ACH transfers: 1-3 business days for standard processing
- Wire transfers: Same business day or next business day
- Check clearing: 1-2 business days for most banks
- Payment terms: Net 30, Net 60, Net 90 (business days)
- Stock settlement: T+1 (trade date + 1 business day)
Government & Administrative
Government agencies use business days for processing:
- Passport processing: 6-8 weeks (business days for expedited)
- FOIA requests: 20 business days initial response
- Permit applications: Often specify business day review periods
- Tax deadlines: Extended to next business day if due date is weekend/holiday
Frequently Asked Questions
No, Saturday is not a business day in the United States. Business days are Monday through Friday only. Saturdays and Sundays are weekend days and are excluded from business day calculations. This applies to banking, shipping, legal deadlines, and most commercial transactions.
There are approximately 251-252 business days per year in the US. A year has 365 days, minus 104 weekend days (52 weeks × 2), minus 10-11 federal holidays. The exact number varies slightly each year depending on how holidays fall. In 2026, there are 250 business days.
Business days and working days are the same thing. Both terms refer to Monday through Friday, excluding federal holidays. The terms are used interchangeably in business, legal, and shipping contexts. "Working days" is more common in British English, while "business days" is preferred in American English.
Yes, 5 business days equals one calendar week (assuming no holidays fall within). Starting from Monday, 5 business days brings you to Friday of the same week. If you start on a different day, add the weekend days: starting Tuesday means ending the following Monday.
No, business days do not include federal holidays. The 11 US federal holidays are excluded from business day counts, even when they fall on a weekday. If a deadline falls on a federal holiday, it typically moves to the next business day.
30 business days equals approximately 42 calendar days (6 weeks). For precise calculations, use our business days calculator, which automatically accounts for weekends and federal holidays to give you the exact date.
Bank holidays closely align with federal holidays but aren't identical. Banks are closed on all federal holidays, and some may close on additional days (Good Friday, for example). For banking transactions, assume all federal holidays are non-business days. The Federal Reserve follows federal holiday schedules.