Research on flame spread and mass burning rate is relevant not only for the improvement our understanding of fire but also for the control of unwanted fires. In flame spread studies, fuel samples are generally burnt and the leading edge is tracked by the researcher to determine how far the flame propagates over the duration of the experiment. In burning rate studies, regression of the surface and mass loss is quantitatively measured and recorded to be related to burning rate with constants associated with the field. Spread rate is generally not considered in burning rate experiments, however there are few studies that correlate the two. This thesis proposes a simplified relationship between the laminar flame spread rate and the burning rate. For this thesis, downwards spread flame experiments are performed in ambient conditions for a variety of thicknesses of flat PMMA. In one geometry, ceramic plates are used to minimize heat losses to the sides and permit buoyancy driven opposed flow of ambient gases to two open faces. In the second geometry, samples are burnt while all four sides are exposed to the ambient conditions while the bottom is pinched by ceramic plates to elevate the sample and prevent the entrainment of air caused from being held too close to the floor. Experiments are analyzed using a MATLAB tool called the Flame Analyzer, and compared to previous spread rate experiments. A conservation of mass analysis is performed to relate the spread rate and the burn angle, defined as half of the angle subtended by the thickness length from the tip of the pyrolysis region, to the burning rate. The burning rate, spread rate, and burn angle vary inversely as thickness increases approaching an asymptotic limit. This trend persists in open and closed geometries though the thick limit changes between the two. A brief study with cylindrical samples confirms the same trends as the closed geometry. Finally, a study with a forced counter flow is discussed, although only thin fuel is studied in this configuration.