Crude Calculations charts a ground-breaking link between autocratic regime stability and economic liberalization amid the global transition to lower-carbon energy sources. It introduces the rent-conditional reform theory to explain how preserving regime stability constrains economic liberalization in resource-wealthy autocracies and hybrid-regimes. Using comparative case studies of Nigeria and Saudi Arabia, the book traces almost one hundred years of political and legal history to provide a framework for understanding the future of economic liberalization in fossil fuel-rich autocracies. Drawing from archival documents and contemporary interviews, this book explains how natural resource rents are needed to placate threats to regime stability and argues that, contrary to conventional literature, non-democratic, resource-wealthy regimes liberalize their economies during commodity booms and avoid liberalization during downturns. Amid the global energy transition, Crude Calculations details the future political challenges to economic liberalization in fossil fuel-rich autocracies—and why autocracies rich in battery minerals may pursue economic liberalization.