# Working days calculator: how to count business days between two dates and why holidays change the answer

> Calendar days and working days are not the same. This guide shows how to count business days between two dates, what changes when the end date is included or the week has a different day off, and how to subtract public holidays by hand.

Published 2026-10-09 by Toolcloak. 3 minute read. Original: https://toolcloak.pages.dev/articles/working-days-calculator-how-to-count-business-days-between-two-dates-and-why-holidays-change-the-answer
Related free tool: [Working Days Calculator](https://toolcloak.pages.dev/tools/working-days-calculator)

A deadline in **calendar days** and a deadline in **working days** can be weeks apart. Delivery promises, notice periods, payment terms and project plans all depend on which one they mean. Counting working days is simple once you decide three things: which days are off each week, whether the end date counts, and which public holidays to remove.

> **In short**
> - From **1 November 2026** to **30 November 2026**, counting both dates, there are **30 calendar days** and **21 working days** with a Saturday and Sunday off.
> - With only Sunday off the same month has **25 working days**. With no weekly off it has **30**.
> - If the end date is left out, the count becomes **20 working days** over 29 days.
> - The tool does **not** remove public holidays. Subtract the ones that fall on a working day yourself.

## How the count works

**Example: 1 to 30 November 2026, Saturday and Sunday off**

1. **Count every day in the range.** 1 November to 30 November, both included, is **30 days**.
2. **Find the weekly off days.** November 2026 has 4 Saturdays and 5 Sundays, so **9 days** are off.
3. **Subtract.** 30 − 9 = **21 working days**.
4. **Convert to work weeks.** 21 ÷ 5 = **4.2 work weeks**.

*The tool also shows total days counted, weekly off days and work weeks.*

Try it: [Working Days Calculator](https://toolcloak.pages.dev/tools/working-days-calculator). Pick a start date, an end date and the weekly off to count the working days between them.

## The weekly off changes the result

| Weekly off | Working days in November 2026 | Work week used |
| --- | --- | --- |
| Saturday and Sunday | 21 | 5 days |
| Sunday only | 25 | 6 days |
| No weekly off | 30 | 7 days |

*Same dates, 1 to 30 November 2026, both days counted. Many offices work a Monday to Friday week, while shops, factories and some services work six days.*

**Working days in November 2026 by weekly off**

|  | Value |
| --- | --- |
| Sat + Sun off | 21 |
| Sun off | 25 |
| No off | 30 |

*A six-day week gives about four more working days in this month than a five-day week.*

## Is the end date included?

The tool lets you choose. If you include the end date, a range from Monday 12 October to Friday 23 October 2026 has **10 working days**. If you leave the end date out, it has 9. Use the first when both days are worked days, such as a project that starts and finishes on the dates given. Use the second when the end date is the day something is due and the work should be finished before it.

> **Read the wording:** 'Within 10 working days' and 'by the 10th working day' can mean the same date or a different one, depending on whether the first day counts. Check how your contract or notice describes it.

## Public holidays are not removed

Public holidays differ by country, state and employer, so the tool counts only the weekly off. Look up the holidays in your range, keep the ones that fall on a working day, and subtract them. A holiday that lands on a Saturday or Sunday has already been taken out and must not be subtracted twice.

**A quarter, 1 October to 31 December 2026**

|  | Value | Note |
| --- | --- | --- |
| Calendar days | 92 | Both dates counted |
| Working days | 66 | Saturday and Sunday off |
| Work weeks | 13.2 | 66 ÷ 5 |
| Days off | 26 | Weekends only, no holidays |

*Subtract public holidays and your own leave from the working days to see the time you really have.*

## Where working-day counts are used

- **Delivery and shipping,** where a promise of 5 to 7 working days skips weekends.
- **Notice periods and payment terms,** which may be written in working days or in calendar days.
- **Project plans,** where tasks are estimated in working days and then laid on the calendar.
- **Pay and leave,** where a month's pay or a leave balance is worked out per working day.

## A simple method for your own count

1. **Count the calendar days** between the two dates, and decide if the end date counts.
2. **Choose the weekly off** that applies to you: two days, one day or none.
3. **Run the calculator** for the working days.
4. **List the public holidays** in the range and remove the ones on working days.
5. **Remove your own leave** to get the days you can actually work.

## Frequently asked questions

### How do I count working days between two dates?

Count all the days in the range, then remove the weekly off days. With Saturday and Sunday off, 1 to 30 November 2026 has 30 days and 21 working days.

### Does the calculator exclude public holidays?

No. It removes only the weekly off. Subtract the public holidays that fall on a working day yourself.

### Is the start date counted?

Yes. The count starts on the start date. You can choose whether the end date is included.

### What if my week has only Sunday off?

Choose Sunday only as the weekly off. The same November 2026 range then has 25 working days.

### How many working days are in a month?

Most months with a Saturday and Sunday off have 20 to 23 working days. It depends on the month's length and the day of the week it starts on.

### How is this different from counting calendar days?

Calendar days count every date. For a plain count of days between two dates, use the [Days Until Date Calculator](https://toolcloak.pages.dev/tools/days-until-date-calculator) or the [Date Difference Calculator](https://toolcloak.pages.dev/tools/date-difference-calculator).