This document provides definitions and formulas for over 500 metrics related to staffing, recruitment, retention, training, compensation, benefits, and other human resources topics. The metrics are organized into categories including staffing, internal movement, staffing effectiveness, turnover, employee engagement, cost of turnover, performance management, education and development, management and leadership, training, compensation, benefits, equity, absence/attendance, employee relations, health and safety, HR profile, HR expense, HRIT, contact center, payroll, workforce demographics, and workforce structure. For each metric, a formula is provided to define how it is calculated.