Business Day Calculator
Add business days to a start date to find the end date — weekends are skipped automatically.
Business Day and Working Time Calculation
Knowing the exact number of business days is essential for setting project deadlines, calculating annual leave, or planning salary payments. Our business day calculator delivers accurate results by excluding weekends and optionally public holidays.
Public Holidays and Regional Differences
When calculating, it is important to consider not only Saturdays and Sundays but also the national and religious holidays for that year. Our tool offers options aligned with the 2026 official holiday calendar to minimise the margin of error.
Leave and Project Management
For example, when you take 10 days off, how many of those days fall on weekends? Or when a task is said to be completed in '20 business days', which date does that correspond to on the calendar? Incorporating these answers into your planning processes helps you set more accurate deadlines.
Shift Work and Non-Standard Working Systems
You can also customise settings for systems outside the standard 5-day working week (6 days or custom shifts). This allows you to generate the most suitable productivity report for your business model and optimise your working schedules.
How to Use
Inputs
Two inputs are sufficient: Start date (the day the process begins) and the number of business days to add. For best results the start date should fall on a weekday.
Example Scenario
If a project delivery period starting on 15 April 2026 is 10 business days, when is the end date?
| Parameter | Value |
|---|---|
| Start date | 15 April 2026 (Wednesday) |
| Business days to add | 10 |
| Weekends skipped | 4 days (2 weekends) |
| End date | 29 April 2026 (Wednesday) |
| Total calendar days | 14 |
Tips for Accurate Results
- 01
Select a weekday as the start date; a weekend entry starts counting from the following Monday.
- 02
Subtract public holidays from the business day count yourself; the calculator only skips weekends.
- 03
For court, enforcement or administrative deadlines, check which specific day the relevant law uses as a reference.
- 04
If you work in different countries, you may also need to account for that country's public holiday calendar.