As a tool to help customers with FIT calculations, KEMET offers a free tool called the KEMET FIT Calculator. This calculator is based on the formulas defined in the MIL-HDBK-217F.
The KEMET FIT Calculator has sections: User Inputs, Factors and FIT Results. This document provides of overview of the controls in each of those sections. While MIL-HDBK-217F describes many capacitor types, the KEMET FIT Calculator focuses only on capacitor types manufactured previously or currently by KEMET.
For an application example of how to use the KEMET FIT Calculator for commercial grade products, please see the KEMET Application Note: “AN1002 – Calculating Failure In Time.”