Free Project Timeline Calculator
Estimate how many weeks a project will take based on total effort hours and weekly available time.
hrs
hrs/week
%
Weeks Needed
8 weeks
Months (approx)1.7 months
Total Hours (with buffer)144 hrs
Weeks Needed vs Total Effort (Hours)
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
Example Calculation
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
Frequently Asked Questions
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