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Statistical PERT®  (SPERT®) is a freely licensed, probabilistic, estimation technique that uses the built-in statistical functions of Microsoft Excel.  Use Statistical PERT to estimate uncertainties with bell-shaped risk properties, like:  task duration, work effort, revenue, expenses, agile story points, project portfolios, event attendance, and more.

There is nothing to install.  Just download a Statistical PERT example workbook or template, then open the downloaded files with Microsoft Excel 2010, Excel 2013 or Excel 2016.

All Statistical PERT downloads are FREE to use, modify and share!  No registration, no macros, no adware, no cost, and no hassle!

Important note:  All SPERT download files are distributed under the GNU General Public License published by the Free Software Foundation.  You may redistribute SPERT files and/or modify them under the terms of version 3 of that license, or (at your option) any later version.  These files are freely available for downloading in the hope that they will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Statistical PERT® Normal Edition, Version 2.2 adds a new Beginners worksheet to help users learn how to easily create probabilistic estimates.  This edition of Statistical PERT uses Excel’s two normal distribution functions, NORM.DIST and NORM.INV to create probabilistic estimates.

Statistical PERT® Beta Edition, Version 1 is a brand-new edition of Statistical PERT that uses Excel’s two beta distribution functions, BETA.DIST and BETA.INV, to create probabilistic estimates for a wider range of bell-shaped uncertainties, including very skewed uncertainties.

SPECIAL RELEASE for smartphone users – SPERT® Mobile!  Download this special version of Statistical PERT Normal Edition that makes it easy to create probabilistic estimates right on your iPhone or Android smartphone.  You must have Excel Mobile installed on your device to use Statistical PERT.  Excel Mobile is a free download on iTunes and Google Play.

Are you using an iPhone, but don’t have the free Microsoft Excel app for iPhone?  Download it from Microsoft now.

Are you using an Android smartphone, but don’t have Excel installed?  Download it from Google Play now.

Statistical PERT® Normal Edition

Statistical PERT® Normal Edition uses Excel’s two normal distribution functions, NORM.DIST and NORM.INV.

Download the SPERT® Normal Edition example workbook

Download the SPERT® Normal Edition (macro-free) template

Download the Quick Start guide for Statistical PERT® Normal Edition to learn how to use Statistical PERT Normal Edition.

Statistical PERT® Beta Edition

Statistical PERT® Beta Edition uses Excel’s two beta distribution functions, BETA.DIST and BETA.INV.

Download the SPERT® Beta Edition example workbook

Download the SPERT® Beta Edition (macro-free) template

Download the Quick Start guide for the Statistical PERT® Beta Edition to learn how to use Statistical PERT Beta Edition.

Bonus Downloads

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