Business Days Calculator
Count or add working days using weekend patterns and holiday dates you control.
Runs in your browser · No sign-up required
How this calculator works
Business Days Calculator performs its core arithmetic in the browser. The page is designed to show the result together with the assumptions and edge-case behavior that can materially change the answer.
Example
Enter a realistic set of values, calculate, and review the primary result plus the supporting metrics before using the result for planning.
Accuracy & data
This static launch build uses weekend rules and user-entered holiday dates; it does not claim an official national holiday dataset.
This static launch build uses weekend rules and user-entered holiday dates; it does not claim an official national holiday dataset.
Frequently asked questions
Are my calculator inputs stored on a server?
No account or calculation database is used in this static V1. D-Day saved events are stored only in your browser.
Does it work on mobile?
Yes. The layout is designed for narrow mobile screens through desktop widths.