As a preemptive response to the widespread need of respiratory medical devices developing in the wake of the COVID-19 pandemic, we propose a low-cost incentive spirometer for respiratory rehabilitation in patients with coronavirus-related pulmonary symptoms. Paperometer, an incentive spirometer manufactured entirely out of paper, aims to address the multifaced problem of medical devices being expensive, not user- or environmentally-friendly, and often inaccessible to those who need them the most.