Business Days Calculator

If a contract says "payment is due within 10 business days," that is not the same as 10 days on the calendar. Starting on a Monday, 10 business days reaches all the way to the Friday two weeks later - 14 calendar days - because the two weekends in between do not count. Add a single holiday and it slips to the following Monday. A business days calculator turns those vague "X working days" promises into a real date you can put on a calendar, and counts the working days inside any range you choose.

This tool does two jobs. The "Days between" mode counts how many working days fall between two dates. The "Add / subtract days" mode takes a start date and a number of business days and tells you the exact date you land on. Both modes skip Saturdays and Sundays automatically, and both let you exclude a custom list of holidays so the answer matches your company, bank, or country.

What counts as a business day

A business day (also called a working day) is a day on which businesses, banks, and government offices are normally open. In the United States and most of the world that means Monday through Friday. Saturdays and Sundays are excluded by default, and public holidays are usually excluded too - though which holidays apply depends entirely on who you are dealing with. A federal office, a private employer, and a bank can all observe different days off, so this calculator never assumes holidays for you. You add the ones that matter.

The formula behind the count

Counting business days is a filter, not a single equation, but it can be written compactly:

A quick approximation for a span is calendar days × 5 ÷ 7, but that only works cleanly for whole weeks. This calculator does the exact thing instead: it inspects every day in the range, keeps the ones that are weekdays, and removes any that match your holiday list. That is why it stays accurate even when a range starts mid-week or straddles a holiday.

How to use this business days calculator

1. Pick a mode: "Days between" to count working days in a range, or "Add / subtract days" to find a deadline.
2. Enter your dates: in "Days between," set a start and end date. In "Add / subtract," set a start date and a number of business days (use a negative number to count backward).
3. Decide on endpoints: in "Days between," use the checkboxes to include or exclude the start and end dates themselves.
4. List your holidays (optional): open the holidays box and enter each closure on its own line as YYYY-MM-DD. The tool skips any that fall on a weekday.
5. Read the result: the big number is your business-day total or resulting date, with a breakdown of weekend days and excluded holidays underneath.

The result updates instantly as you type - there is no submit button to press.

Who this calculator is for

• Project managers mapping "10 working days" into a real milestone date.
• HR and payroll teams counting working days in a pay period or onboarding window.
• Shoppers and shippers estimating when a "5-7 business day" delivery actually arrives.
• Legal and finance staff tracking notice periods, payment terms, and filing deadlines stated in business days.
• Freelancers and contractors setting realistic turnaround dates that skip weekends and holidays.
• Anyone who needs to translate a "within X business days" promise into a date on the calendar.

Worked example 1: counting days in a range

Suppose you want the working days from Monday, June 1, 2026 to Friday, June 12, 2026, with both endpoints included and no holidays. That span has 12 calendar days. Two of them fall on the weekend of June 6-7, leaving 10 business days. If you then exclude one holiday that lands on a Thursday inside the range, the count drops to 9 business days. The breakdown card shows all three figures - 10 business days, 2 weekend days, 1 holiday excluded - so you can see exactly where the number came from.

Worked example 2: finding a deadline

Now say an order ships in 5 business days starting Wednesday. Counting Thursday, Friday, then skipping the weekend, then Monday, Tuesday, Wednesday gives a delivery date of the following Wednesday - 7 calendar days later, not 5. Drop in a Monday holiday and the same 5 business days push the arrival to Thursday. This is the single most common reason "5 business days" feels slower than people expect: every weekend and holiday inside the window quietly adds calendar time.

Worked example 3: counting backward

Deadlines work in reverse too. If a filing is due on a fixed date and you must act 3 business days before it, enter the due date as your start and -3 as the number of days. The calculator steps backward, skipping weekends and holidays, and returns the latest weekday you can still act on. This is handy for notice periods, "respond no later than" clauses, and scheduling work so it finishes ahead of a hard date.

Calendar days vs. business days at a glance

Because the gap between calendar and business days grows with the length of the span, it helps to see typical conversions. The table below assumes a Monday start and no holidays:

A handy rule of thumb: a typical month holds about 21-23 business days, and a full work year is roughly 260 weekdays before holidays and paid time off are removed.

Key terms explained

• Business day / working day: a weekday (Mon-Fri) when offices and banks are normally open.
• Calendar day: any day, including weekends and holidays.
• Bank day: a business day on which banks process transactions; used for payment and clearing deadlines.
• Inclusive count: a count that includes both the start and end dates.
• Net working days: business days in a range after weekends and holidays are removed - what spreadsheet functions like NETWORKDAYS return.
• Observed holiday: when a holiday falls on a weekend, the day off may shift to the adjacent Friday or Monday; enter the observed date you actually get off.

Tips for accurate results

• Use the right holiday list. Banks, employers, and government offices observe different days. Enter the schedule that governs your deadline, not a generic one.
• Enter observed dates. If a holiday on a Saturday is observed the prior Friday, list the Friday - that is the day actually closed.
• Mind the endpoints. "From Monday to Friday" is 5 days inclusive but 3 days if you exclude both ends. Match the checkboxes to how your deadline is worded.
• Check the start weekday. The same number of business days lands on a different date depending on whether you start on a Monday or a Thursday.
• Confirm cutoff times. An order placed after a daily cutoff often counts as starting the next business day.

How business-day deadlines are used in real life

"Business days" appear everywhere money and paperwork move. Shipping carriers quote transit in business days, so a "3-5 business day" package ordered Thursday may not arrive until the middle of the next week. Banks describe ACH transfers, check holds, and refund timelines in business days. Employers measure notice periods, probation windows, and response deadlines the same way. Courts and agencies frequently set filing deadlines in business days, and many consumer-protection rules - such as the right to cancel certain contracts - are written that way too. In every case, converting the business-day count to a calendar date up front prevents missed deadlines. If your deadline is instead stated in plain calendar days, switch to the Date Calculator, which counts every day including weekends.

Limitations and assumptions

• It assumes a standard Monday-Friday work week. Some industries and countries use different working days (for example, a Sunday-Thursday week), which this tool does not model.
• It does not add holidays for you - you must enter them - and it does not know regional or one-off closures.
• It counts whole days only; it cannot represent half-days, early closures, or business hours.
• It ignores time zones and daily cutoff times, which can shift the effective start by a day.
• Results are a planning estimate. For binding deadlines, confirm the exact rule and holiday schedule with the organization involved.

Counting business days in a spreadsheet (NETWORKDAYS)

If you would rather work in a spreadsheet, Excel and Google Sheets both have functions that mirror what this calculator does. NETWORKDAYS(start, end, [holidays]) returns the number of whole working days between two dates, counting both endpoints and skipping Saturdays and Sundays. Pass a range of holiday cells as the third argument and it removes those too - exactly the "days between" mode on this page. To go the other direction and find a date, WORKDAY(start, days, [holidays]) adds a number of business days to a start date and returns the resulting date, which matches the "add / subtract days" mode. Two cautions carry over from those functions to this tool: NETWORKDAYS always includes both ends (so "Monday to Friday" returns 5, not 4), and both functions assume a fixed Saturday-Sunday weekend unless you use the .INTL variants. This calculator gives you the same result without a formula, and the endpoint checkboxes let you match counts that exclude one or both ends.

Business days around the world

The Monday-to-Friday work week is standard across the United States, Canada, the United Kingdom, and most of Europe, Latin America, and East Asia - but it is not universal. Several countries in the Middle East run a Sunday-to-Thursday week, with Friday and Saturday as the weekend, and a few use a Saturday-to-Wednesday or split arrangement. Because this calculator is built around a Monday-Friday week, it will not match a deadline measured against one of those alternative calendars. The same applies to industries that operate on non-standard schedules, such as retail, hospitality, and healthcare, where "working days" may include weekends. If your counterpart follows a different week, treat the result here as an approximation and confirm the exact working days that govern the deadline. For domestic US deadlines - shipping, banking, payroll, and most contracts - the Monday-Friday assumption is correct.

Why companies measure in business days at all

Stating a timeline in business days rather than calendar days is a deliberate choice: it sets an expectation that does not depend on which day of the week a request comes in. A bank that promises a refund "within 5 business days" can give the same answer whether you call on a Monday or a Saturday, because the count only ticks on days the bank actually processes transactions. The trade-off is that customers routinely underestimate the wait, since a weekend or a holiday silently stretches the calendar gap. Reading the timeline back as a concrete date - which is what this tool produces - closes that expectation gap and is the single most useful thing you can do when a deadline is stated in working days. It is also why the breakdown card here shows the weekend and holiday counts alongside the total: seeing that "10 business days" hides two weekends makes the real wait obvious at a glance.

How it compares to related calculators

This page answers "how many working days, or what date is X business days out?" For other date and time questions, a sister tool fits better:

• To add or subtract calendar days (weekends included), use the Date Calculator.
• To find your exact age in years, months, and days, use the Age Calculator.
• To add and convert hours, minutes, and seconds, use the Time Calculator.
• To total the hours worked in a shift or timecard, use the Hours Calculator.
• To count down to a future event in days, use the Countdown Calculator, or find the ISO week number for any date.

Sources

• U.S. Office of Personnel Management (OPM) - Federal Holidays (the federal calendar many US offices observe).
• Federal Reserve - Holidays Observed by the Federal Reserve System (bank-day closures for transfers and clearing).
• International Organization for Standardization - ISO 8601 date format (the YYYY-MM-DD format used for the holiday list).