Business Day Deadline Calculator
Add or subtract business days (working days) from any date, or count business days between two dates. Exclude weekends and public holidays (UK/US), add custom holiday dates, and share your exact settings using a link.
Add business days to a date
Quick answers: weekends are excluded by default · choose UK/US holidays or none · share a settings link in one click.
How this was calculated
Advanced options
This free business day (working day) calculator runs entirely in your browser—no login required. Use it for invoice due dates, contract deadlines, notice periods, SLAs, school/work planning and delivery estimates. Exclude weekends, include UK or US public holidays, add custom holiday dates, and copy/share a link that keeps your exact settings.
Shortcuts: T Today · A Advanced · C Copy date · L Copy link · 1/2 switch tabs
Planning tool only — for contracts/legal deadlines, always verify the applicable rules and calendars.
Count working days between dates
Uses your current weekend + holiday settings (from Advanced options).
Breakdown
Tip: Adjust weekend/holiday settings in Advanced options (on the Add/Subtract tab) and come back here — the settings are shared.
FAQ
What is a business day (working day)?
A business day usually means Monday–Friday, excluding public holidays. Use Advanced options to decide whether Saturdays/Sundays are excluded and whether holidays are included.
Does this include public holidays?
Yes — choose a holiday calendar (UK or US) in Advanced options, or select “None” to ignore holidays. You can also add custom holiday dates.
Why did my deadline “move”?
If the calculated date lands on a weekend/holiday, you can choose what happens: roll forward, roll backward, or keep the date.
Can I share the exact settings?
Yes. Use “Copy link”. The URL contains your mode, days, dates, weekend rules, holiday set and roll rule.
Do you store my data?
No accounts and no server storage. If you add custom holidays, they are stored locally on your device (in your browser).