Aviator's engineering efficiency calculator is designed to help measure the productivity of engineering teams by identifying "hidden pockets" of time wasted on build and test failures, flakiness, and merge conflicts. The calculator takes into account inputs such as GitHub activities and branch usage, estimating how much time is wasted weekly on managing these issues. It provides a glimpse into the impact of these inefficiencies on DORA metrics like lead time for changes and deployment frequency, highlighting opportunities to improve efficiency and reduce waste in engineering workflows. By analyzing system metrics and providing a more comprehensive view of productivity, Aviator's calculator aims to help large engineering teams optimize their processes and save hundreds of engineering hours every week.