# Calculations
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The supply chain calculations in this guide have been separated into the following categories:
+ [Forecast error](forecast-error.md) – These calculations help you evaluate the accuracy of previous forecasts.
+ [Distribution and warehousing](distribution.md) – These calculations help you evaluate the throughput of your supply chain.
+ [Inventory](inventory.md) – These calculations help you plan, manage, and control your inventory.
+ [Transportation](transportation.md) – The calculations help you evaluate the process of moving inventory in and out of your organization.