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Programme calculator
Working Days and Construction Programme Calculator
Plan site programmes from a start date and working-day duration, or count working days between two dates. Set Mon–Fri or six-day weeks, include England & Wales bank holidays, and exclude site shutdowns.
Read the guide: Working Days and Construction Programme Calculator.
Free to use. No registration required.
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Read articleFrequently asked questions
How do working days differ from calendar days?
Calendar days count every day on the clock. Working days skip weekends (or other non-working weekdays), bank holidays and any excluded dates you enter. A 20-working-day task on a Mon–Fri calendar usually spans more than 20 calendar days.
How does the finish-date calculation work?
Starting from the start date, the calculator moves forward day by day, counting only valid working days, until it has N of them. The Nth working day is the finish date. If the start date itself is not a working day, counting begins on the next working day.
Which bank holidays are included?
With the England & Wales option on, the tool adds New Year’s Day, Good Friday, Easter Monday, Early May, Spring and Summer bank holidays, Christmas Day and Boxing Day, including weekend substitute days. Add Scotland, Northern Ireland or site-specific days in the extra holidays box.
What are excluded dates for?
Use them for site shutdowns, client closures, industry shutdown weeks or any other non-working dates that are not public holidays. They are treated the same as bank holidays when counting the programme.
Can I count working days between two dates?
Yes, switch to “Start + finish → working days”. The count includes both the start and finish dates when they are working days.
Can I run a six-day site week?
Yes. Choose Mon–Sat, every day, or custom weekdays (for example Tue–Sat). The programme then treats only those weekdays as working, still skipping holidays and exclusions.