The Windchill Sizing Calculator is a tool that can be used to evaluate the size of a global Windchill deployment. The tool is an interactive spreadsheet that allows you to quantify users and come up with an estimated size for your Windchill server hardware. Use this tool in conjunction with the hardware sizing guide for your platform to calculate the necessary Weighted Active User Ratio. In the sizing guides, PTC identifies the Weighted Active User Ratio as a minimum recommendation for your system.