Project Timeline Calculator
Estimate how many weeks a project will take based on total effort hours and weekly available time.
Weeks Needed
8 weeks
Weeks Needed vs Total Effort (Hours)
公式
## How to Estimate a Project Timeline Divide total effort by weekly available hours, then add a buffer for unknowns and scope changes. ### Formula **Buffered Hours = Effort x (1 + Buffer %)** **Weeks = Buffered Hours / Hours Per Week**
计算示例
120-hour project, working 20 hours/week, with 20% buffer.
- 01Buffered hours = 120 x 1.20 = 144 hours
- 02Weeks needed = ceil(144 / 20) = 8 weeks
- 03Months = 8 / 4.33 = 1.8 months
常见问题
How much buffer should I add?
10-20% for well-defined projects, 30-50% for projects with significant unknowns. Buffer absorbs scope creep, debugging, and unexpected delays.
Why use available hours instead of total work hours?
Not all work hours go to a single project. Account for meetings, email, admin, and other projects when estimating available time.
How do I estimate total effort hours?
Break the project into tasks, estimate each one, and sum them. Use past projects as benchmarks. When in doubt, triple your initial gut estimate.
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