“How many working days until the deadline?” is a question that sounds simple until weekends and holidays get involved. This tool does the counting for you, with full control over which dates should be excluded.
What Is the Business Days Calculator?
Switch between two modes: Count between dates tells you how many Monday-through-Friday business days fall between a start and end date (inclusive), and Add N business days tells you what date you land on after skipping forward a given number of business days from a starting date. Both modes let you list holiday dates to exclude from the count.
How to Use It
- Open the tool at /tools/business-days-calculator.
- Pick a mode: Count between dates or Add N business days.
- Enter your start date (and end date, or number of days to add).
- Optionally list holiday dates, one per line, to exclude them from the count.
- Read the result instantly — no submit button needed.
Key Features
- Two calculation modes covering the most common business-day questions.
- Custom holiday list, entered manually so the tool stays fully offline with no live calendar API.
- Weekend exclusion (Saturday/Sunday) built in automatically.
- Fully client-side, nothing ever leaves your browser.
When to Use This Tool
- Project deadline planning, figuring out how many working days remain.
- SLA and contract calculations that specify turnaround in business days.
- Payroll and invoicing schedules that need to skip weekends and public holidays.
Try It Now
Open Business Days Calculator directly, or press ⌘K and type the tool name from anywhere on the site.
Part of the Date & Time Tools collection on WebdevToolbox — free, browser-based developer tools with no login required.