Work out project effort estimate instantly with clear inputs, formula shown and shareable results.
Parametric estimating multiplies a size measure by a historical productivity rate, then adds contingency for known unknowns. Dividing total effort by team capacity gives elapsed duration — but only up to a point, since adding people to a late project rarely shortens it proportionally.
Base effort
Base hours = Size units x Hours per size unit
Total effort
Total = Base hours x (1 + Contingency %)
Elapsed weeks
Weeks = Total hours / (Team size x 40)
Your own completed projects. Industry averages vary by an order of magnitude across domains and are close to useless without calibration.
Almost never. Communication overhead grows with team size, and some work is inherently sequential.