Deadline Calculator Widget

How it works

A deadline calculator works backwards from a start date, adding a specified number of business days to determine a due date. It automatically skips weekends – so if you add 5 business days to a Friday, the result is the following Thursday, not Monday.

This is different from a simple date calculator, which would include weekends in the count. For any process that operates on working days only, a deadline calculator gives the right answer.

Common uses:

• Project management: work out when a phase or deliverable is due based on available working days
• HR processes: grievance response deadlines, disciplinary hearing notices, right-to-respond periods
• Legal and compliance: response deadlines for complaints, appeals or regulatory submissions
• Client services: set realistic delivery milestones for clients based on working days, not calendar days

Deadline calculator vs business day calculator: a business day calculator tells you how many business days fall between two dates. A deadline calculator tells you when a deadline falls, given a start date and a number of business days to add. Use the business day calculator when you have both dates and want the count. Use the deadline calculator when you have a start date and need the end date.

Note on public holidays: this calculator skips weekends but does not account for UK or international public holidays. For processes where holidays affect the deadline, you'd need to manually adjust or use a calendar that supports holiday exclusion.

How to add it