Add or subtract working days while respecting work patterns and optional public holidays. This is a free calculator built for quick repeat checks on mobile and desktop.
People usually use a working day calculator when they need to know what date lands 5, 10, or 30 business days away and they do not want weekends or public holidays to throw the answer off. In the UK, notice dates, leave dates, and business-day deadlines often depend on whether weekends count, whether bank holidays are excluded, and whether the contract sets a rule that is more specific than the default assumption.
The most common mistake is using a Monday-to-Friday assumption when the real work pattern includes weekends, part-time days, or substitute public holidays. If the date is contract-sensitive, check whether the relevant rule is calendar days, working days, or a fixed number of weeks, because those three approaches can land on different dates.
UK guidance on this page is a practical planning layer, not legal advice. If the answer affects pay, dismissal, leave entitlement, or a formal workplace process, verify it against the contract, policy, collective rule, or official guidance that applies to your role.