Project Timeline Calculator
Estimate a project's finish date from its start date and duration in working days, or check whether it fits before a deadline.
Your results
Calculation breakdown
- Finish date
- Start date + N business days, skipping weekends and entered holidays
Worked example
Starting Monday 06/07/2026 with a 20 business-day project and no holidays finishes on Friday 31/07/2026.
Assumptions
- Only weekends and manually entered holidays are excluded — task dependencies and delays are not modelled.
- This is a planning estimate, not a project management tool.
How this calculator works
Enter a project start date and duration in business days to estimate the finish date, skipping weekends. You can also enter a target deadline to see how much buffer time is left, or by how many days the project would run over.
Frequently asked questions
Does this account for public holidays?
You can enter an estimated number of public holidays within the timeline to be excluded from the working days count.
How is the finish date calculated?
The calculator counts forward from the start date, skipping Saturdays and Sundays, until the required number of business days is reached.
Can I compare against a fixed deadline?
Yes, enter your deadline date to see whether the estimated finish date falls before or after it, and by how many days.