PERT Calculator

An Alfred Workflow

Short Description

Generates accurate time estimates based on optimistic, realistic, and pessimistic expectations

Last Updated

15 May 2018


Mountain Lion
Snow Leopard
Yes Yes Yes Yes Yes



Bundle ID



This workflow provides a simple calculator to generate a three-point accurate time estimate. You provide the workflow with three time estimates:

  1. "optimistic" - if everything goes better than expected this could take as little as X time
  2. "realistic" - realistically I expect this task to take X time
  3. "pessimistic" - if many things go wrong, this task could take up to X time

Based on those three time amounts, given in hours and/or minutes, you will receive an accurate time estimate, as well as a “safe” or cautious time estimate.

You may want to read about three-point estimation and PERT.

Version 3.0

In this version I updated the workflow to handle the Sierra background process bug. Many thanks to deanishe for the "Fixum" workflow!

Version 2.0

In this version I've added a "Copy to clipboard" option in the results. I've also included information about the formulas in the results.