Project the end date from a start date, duration and non-working days.
Working-day durations must be walked forward because the weekends crossed depend on the start weekday. Ninety working days spans about eighteen calendar weeks rather than thirteen. Quoting a project end date from calendar arithmetic rather than working days is how deadlines end up roughly 40 per cent too optimistic.
Project End Date
Step forward from the start date, counting only working days until the duration is met
Step forward from the start date, counting only working days until the duration is met Working-day durations must be walked forward because the weekends crossed depend on the start weekday. Ninety working days spans about eighteen calendar weeks rather than thirteen.
Quoting a project end date from calendar arithmetic rather than working days is how deadlines end up roughly 40 per cent too optimistic.
This calculator takes 5 inputs: Start date year, Start date month, Start date day, Duration in working days, Public holidays in the period. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.