Return on Assets measures how efficiently a company uses its total asset base to generate profit. It divides trailing twelve-month net income by average total assets, producing a percentage that represents the return earned per dollar of assets deployed in the business.
ROA is most useful for comparing companies within the same industry because asset intensity varies enormously across sectors. A software company with few physical assets and a 20% ROA is not necessarily better managed than a utility with massive infrastructure and a 3% ROA — they simply have different business models. Within a peer group, however, a higher ROA generally indicates better management of the asset base.
ROA uses average total assets (the average of the beginning and ending balance) rather than the ending balance to more accurately reflect the assets that were actually deployed throughout the measurement period.