Project Timeline Calculator
Project Duration Estimate
Estimate project duration from total effort and team size
hours
days
%
Effort Estimator
Estimate total effort from number of tasks
hours
Formula
Duration = Total Effort / (Team Size x Hours per Day) x (1 + Buffer%) | Effort = Tasks x Avg Hours x Complexity
Frequently Asked Questions
How much buffer should I add to a project timeline?
A common rule of thumb is 15-25% buffer for well-understood projects. For projects with significant unknowns, use 30-50%. The buffer accounts for unexpected issues, scope changes, meetings, and context-switching overhead.
What are productive hours per day?
Most knowledge workers are productive for 5-6 hours in an 8-hour workday. The rest is spent on meetings, email, breaks, and context switching. Using 6 hours is a realistic estimate for planning.
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