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This document is a User’s Guide for the Project Evaluation Toolkit (PET). PET is a spreadsheet-based application that offer users a familiar and powerful data manipulation interface for evaluation of abstracted networks’ improvements and modifications. PET includes a travel demand estimation module implemented as a set of external C++ programs for destination, mode, time of day, and route choices, across multiple user classes. Other functional modules, including economic analysis, environmental impact evaluation, safety evaluation, sensitivity analysis, and budget allocation, are implemented in Microsoft Excel spreadsheets. PET can be used with or without its travel demand model (TDM) component. Users with existing TDM outputs can rely on PET’s back-end programming for estimates of traveler welfare, emissions, crashes, and travel-time reliability used to generate benefit-cost ratios, internal rates of return, and other metrics that characterize projects on any network, whether coarse or detailed, small or large. In other words, PET can play a vital role in almost any project evaluation setting. This user manual is broken into two main sections: Part 1, Using the Toolkit and Part 2, Understanding the Toolkit. Part 1 takes users through a step-by-step process showing how to load PET, develop scenarios, run the travel demand model, and understand the resulting outputs. Part 2 goes deeper into the background behind the methodologies used to develop the PET framework and many of the parameters.