Working Days Calculator UK | Business Days Between Dates

How to Use This Working Days Calculator

Our working days calculator is designed to make it quick and straightforward to count business days between any two dates in the UK. Whether you are calculating a notice period, planning a project timeline, or working out payroll dates, here is how to get accurate results in seconds.

Step 1: Choose Your Calculation Type

Select from four tabs at the top of the calculator. Between Dates counts working days between two dates. Add Working Days finds a future date by adding business days. Subtract Days works backwards from a deadline. Deadline Finder calculates end dates for standard UK notice periods.

Step 2: Enter Your Dates

Click the date fields to select your start and end dates using the calendar picker. You can also type dates directly in the format shown. For the "Between Dates" tab, tick "Include start date" if the first day itself should be counted as a working day. Many employment contracts, for example, start counting from the day after notice is given.

Step 3: Configure Bank Holiday Settings

By default, the calculator excludes UK bank holidays. You can untick "Exclude bank holidays" if you only want to exclude weekends. Choose your Bank Holiday Region from the dropdown — England & Wales, Scotland, or Northern Ireland — as each nation has different bank holiday dates. This is particularly important for cross-border businesses and remote workers.

Step 4: View Your Results

Click the calculate button and your results will appear instantly. The breakdown shows total working days, calendar days, weekend days, and bank holidays that fall within your selected period. You will also see the number of working weeks and the percentage of days that are business days — useful for project planning and resource allocation.

Worked Examples: Working Days Calculations

Here are some practical examples showing how working day calculations apply to common UK scenarios. These will help you understand how bank holidays and weekends affect the count.

UK Bank Holidays 2025–2026: Complete Reference

Planning ahead requires knowing bank holidays for both the current and previous year. Below is the complete list of bank holidays for England & Wales across 2025 and 2026. Our calculator automatically accounts for all of these dates.

England & Wales Bank Holidays 2025

Total 2025: 8 bank holidays (England & Wales) — 253 working days in the year

England & Wales Bank Holidays 2026

Total 2026: 8 bank holidays (England & Wales) — 253 working days in the year

Understanding Working Days in the UK

The terms "working days," "business days," and "weekdays" are often used interchangeably, but they have distinct meanings in different UK legal and professional contexts. Understanding the differences is essential for accurate planning.

Working Days vs Calendar Days vs Business Days

A calendar day is any day of the year, including weekends and bank holidays. A weekday refers to Monday through Friday, regardless of bank holidays. A working day (also called a business day) is a weekday that is not a UK bank holiday.

This distinction matters because many UK deadlines, contracts, and regulations specify which type of day to use. For example, a "30 calendar day" deadline includes weekends, whereas a "30 working day" deadline does not.

Legal and Employment Requirements

UK employment law uses working days for several key calculations. Statutory notice periods under the Employment Rights Act 1996 are defined in weeks, where a week means seven consecutive days. However, most employment contracts specify notice in working days or calendar months.

Employment tribunal claims must be filed within strict time limits, often calculated in calendar days. HMRC deadlines for Self Assessment, VAT returns, and PAYE submissions are typically set using calendar dates, but processing times are quoted in working days. Understanding which type of day applies can be the difference between meeting a deadline and missing it.

Project Management and Business Planning

For project managers, resource planning, and scheduling, working days are the standard unit. A project estimated at 20 working days will take approximately one calendar month, but this varies depending on which month you are in and whether bank holidays fall within the period. May, for instance, has only 19 working days in 2026 due to two bank holidays, compared to July with 23. Agile sprints, delivery timelines, and service level agreements (SLAs) are almost always measured in working days.

Impact on Payroll and Deadlines

Payroll teams need to know the exact number of working days each month to calculate daily pay rates, pro-rata salaries for starters and leavers, and overtime payments. If an employee starts mid-month, their pay is typically calculated as their monthly salary divided by the number of working days in that month, multiplied by the days they actually worked. Bank holidays that fall on weekends can create complications — the substitute day still reduces the working day count. Our calculator handles all of these scenarios, including substitute bank holiday dates, to give you an accurate count every time.