Business Days Calculator Guide: Count Working Days & Deadlines (2026)

What Counts as a Business Day?

The standard definition of a business day is any weekday — Monday through Friday — that does not fall on a federal holiday. This definition applies across most US industries, government agencies, courts, and financial institutions.

The Monday–Friday Rule

Saturday and Sunday are never counted as business days under US law or standard business practice. This is consistent across the Uniform Commercial Code (UCC), IRS filing rules, and most employment contracts. If a deadline falls on a weekend, it typically shifts to the following Monday.

The US Office of Personnel Management (OPM) administers the federal holiday schedule, which applies directly to federal employees and serves as the reference point for most commercial and legal contexts. OPM designates 11 federal holidays per year.

Federal Holiday Exclusions

Federal holidays are non-working days for government operations and are excluded from business day counts. When a federal holiday falls on a Saturday, it is observed on the preceding Friday. When it falls on a Sunday, it shifts to the following Monday.

Regional and State Differences

Some states recognize additional holidays beyond the federal 11. For example, California observes Presidents' Day as a state holiday with slightly different rules for certain courts. States like Massachusetts observe Patriots' Day in April, which can affect local deadlines. Always check state-specific rules if you're calculating deadlines under state law.

International Variations

Outside the US, “business days” still means weekdays excluding public holidays — but the specific holidays differ dramatically. The UK, Canada, and Australia each have their own sets of bank holidays. Cross-border contracts often specify which country's holiday schedule governs the agreement to avoid ambiguity.

US Federal Holidays 2026

The following 11 days are designated federal holidays in 2026 by the US Office of Personnel Management. These dates exclude weekends and holidays from any business day count.

Note: Independence Day falls on a Saturday in 2026, so the observed holiday is Friday, July 3. This means you lose both Friday July 3 and the weekend, creating a 3-day gap in business days around the Fourth of July.

Columbus Day and Veterans Day are sometimes called “lesser-observed” federal holidays because many private businesses remain open. Banks chartered by the Federal Reserve do observe these days, so check with your financial institution before assuming they're open.

How to Count Business Days Manually

Counting business days manually is straightforward once you know the rules. Here is the step-by-step method.

Step-by-Step Method

1. Identify your start date. Do not count the start date itself — counting begins on the next day.
2. Move forward one day at a time. For each day, check: is it a weekend? Is it a federal holiday? If yes to either, skip it.
3. Count only Monday–Friday non-holidays. Each qualifying day increments your count by one.
4. Stop when you reach your target count. The day you land on is your deadline.

Example: You need to find 5 business days from Monday, March 30, 2026.

Handling Month and Year Boundaries

Month boundaries add no complexity — just keep counting. The trickier part is knowing how many days each month has (28–31) and remembering February has 28 days in 2026 (not a leap year). Year boundaries work the same way: December 31 is followed by January 1, which is a federal holiday, so your first business day of 2026 was January 2.

The Formula for Counting Weekdays Between Two Dates

For programmers or those doing bulk calculations, the mathematical formula for counting weekdays between two dates (ignoring holidays) is:

Weekdays = (Total days × 5/7) – adjustment for partial weeks

More precisely: calculate the number of complete weeks between dates (multiply by 5), then add the remaining days while checking whether they fall on weekdays. Most spreadsheet tools handle this with the NETWORKDAYS() function in Excel or Google Sheets, which also accepts a list of holiday dates to exclude.

Business Day Deadlines in Contracts and Legal Contexts

Business day definitions carry real legal weight in contracts and regulations. Getting this wrong costs money.

Net 30/60/90 Payment Terms

Under UCC Article 2, which governs the sale of goods in the US, “net 30” means payment is due 30 calendardays from the invoice date — not 30 business days. This is the default unless your contract specifies otherwise. Net 60 and Net 90 follow the same rule.

If you want business days instead, the contract must state “net 30 business days.” That would mean roughly 6 calendar weeks, not 4. The distinction matters enormously for cash flow planning.

3-Day Right of Rescission

Under the Federal Truth in Lending Act, borrowers who use their primary home as collateral (as in a home equity loan or refinance) have a 3-business-day right to cancel the transaction. The 3 days exclude weekends and federal holidays, so signing on Thursday gives you until the following Tuesday (skipping Saturday and Sunday) to rescind.

Legal Notice Periods

Courts at both the federal and state level use business days for procedural deadlines. Under the Federal Rules of Civil Procedure, when a period is stated in days, every day counts — including intermediate Saturdays, Sundays, and legal holidays — unless the period is under 11 days, in which case only business days count. Always read the specific rule, because “days” and “business days” are not interchangeable in litigation.

Shipping Lead Times

USPS, FedEx, and UPS all express shipping estimates in business days. According to USPS service standards, Priority Mail delivers in 1–3 business days. Ground shipping from major carriers is typically 3–7 business days. These estimates exclude weekends and federal holidays, which is why packages shipped late Friday often arrive mid-week rather than the following Monday.

Business Days vs Calendar Days by Industry

Different industries have settled on different conventions, and mixing them up causes real problems.

Banking: T+2 Securities Settlement

The SEC requires that most US securities trades settle within 2 business days of the trade date (T+2). This means if you sell stock on a Friday, the proceeds settle the following Tuesday (skipping the weekend). The Federal Reserve also uses business days exclusively for wire transfers and ACH transactions — same-day ACH cutoff times are based on business day schedules.

Legal: Court Deadlines

Court deadlines are highly sensitive to the business day vs. calendar day distinction. IRS deadlines are a clear example: if a tax filing deadline falls on a weekend or federal holiday, it shifts to the next business day. The IRS confirmed this rule applies to returns, extensions, and estimated payments. Always verify whether a court or agency uses calendar days or business days before calculating a deadline.

HR: Payroll Cycles

Payroll is processed on business days. If your normal payday falls on a federal holiday (like Christmas on a Friday), most employers process payroll a day early — Thursday — so employees receive funds before the holiday. The American Payroll Association advises employers to notify employees in advance when holidays shift pay dates.

Real Estate: Closing Windows

Real estate purchase contracts typically give buyers a certain number of business days to complete inspections, secure financing, and clear contingencies. A “10-business-day inspection contingency” starting on a Thursday in late November (near Thanksgiving) could run into multiple holiday interruptions and stretch well into the following month. Real estate agents routinely have to walk clients through exactly this calculation.

Frequently Asked Questions

What counts as a business day?

A business day is any weekday — Monday through Friday — that is not a federal holiday. Weekends are never business days. The US Office of Personnel Management publishes the official list of 11 federal holidays each year that are excluded from business day counts.

Does “net 30” mean 30 business days or 30 calendar days?

Net 30 means 30 calendar days by default under UCC Article 2, which governs commercial transactions in the US. If your contract says “net 30 business days,” that's approximately 6 calendar weeks. Always read the exact contract language — the distinction has real cash flow implications.

How do I count 5 business days from today?

Start the count on the day after today. Skip any Saturdays, Sundays, and federal holidays as you count forward. Stop when you reach 5 qualifying weekdays. Our Business Days Calculator handles this automatically, including 2026 federal holidays.

Are bank holidays the same as federal holidays?

Mostly. The Federal Reserve observes all 11 federal holidays, and most banks follow suit. However, Columbus Day and Veterans Day are sometimes skipped by private banks, which may stay open. Always check your specific bank's holiday calendar for anything time-sensitive.

What is T+2 settlement in business days?

T+2 means a stock or ETF trade settles 2 business days after the trade date. Sell on Monday, and your cash settles Wednesday. Sell on Thursday, and it settles Monday (skipping the weekend). This is the SEC-mandated standard settlement cycle for most US equity securities.

Do USPS shipping estimates count business days or calendar days?

USPS estimates like “2–3 business days” exclude weekends and federal holidays. A package shipped Friday using 2-day Priority Mail will typically arrive Tuesday, not Sunday. USPS does not deliver standard mail on Sundays, and delivery halts on all 11 federal holidays.