We describe the design, construction, and characterization of paper-based devices to perform spirometry, a standard test for lung function assessment. In this device, the instantaneous flowrate of the incoming breath from a person gets transformed to a specific acoustic frequency. In this manner, the time-course of the person's breath profile is mapped to a timevarying acoustic signal. The captured acoustic signal can be converted to standard spirometry curves and relevant parameters can be extracted as we describe in this paper. We compared our device with commercially available devices and showed that these paper-based devices provide similar performance. These devices have the advantage of low-cost, and simplicity of operation compared to currently available commercial products.