Project Timeline Calculator

1. Estimate total effort

Enter the combined labor hours required across all project work.

2. Set active team capacity

Use the number of people who will contribute regularly, not everyone listed as a stakeholder.

3. Choose productive daily hours

Exclude routine meetings, administration, and other work that reduces project capacity.

4. Set the workweek

Enter the number of project working days in a typical week.

5. Add contingency

Apply a buffer for rework, uncertainty, and minor delays, then review the working-day and week estimates.

Base working days = Total effort ÷ (Team members × Productive hours per day) Contingency days = Base working days × Contingency rate Total working days = Base working days + Contingency days Calendar weeks = Total working days ÷ Working days per week

Where:

• Total effort — sum of estimated labor hours
• Team members — people contributing at the assumed daily capacity
• Contingency rate — percentage added for uncertainty

Assumptions: Capacity is treated as constant and work is assumed to be divisible across team members. Dependencies and fixed waiting periods are not modeled.

What the result means

The output highlights base working days, contingency days, and total calendar weeks. It is most useful for early planning and scenario comparisons; dependencies, approval delays, holidays, and uneven staffing should still be added to a formal project plan.

Timeline estimates exclude dependencies and fixed external delays unless reflected in the inputs.

Given:

• Total effort: 720 hours
• Active team members: 5
• Productive time: 6 hours per person per day
• Working days: 5 per week
• Contingency: 20%

Calculation:
Base days = 720 ÷ (5 × 6) = 24. Contingency = 24 × 20% = 4.8 days. Total = 28.8 working days. Calendar weeks = 28.8 ÷ 5 = 5.76.

Result: 28.8 working days, or about 5.76 weeks

Interpretation: With steady capacity, the work fits into roughly six workweeks before adding fixed review or approval delays.