Defence Science and Technology Laboratory (Dstl) 1 article published in JoVE Engineering Blast Quantification Using Hopkinson Pressure Bars Samuel D. Clarke1, Stephen D. Fay1,2, Samuel E. Rigby1, Andrew Tyas1,2, James A. Warren1,2, Jonathan J. Reay2, Benjamin J. Fuller1, Matthew T. A. Gant3, Ian D. Elgy3 1Department of Civil & Structural Engineering, University of Sheffield, 2Blastech Ltd., 3Blast and IED Protection, Physical Sciences Department, Defence Science and Technology Laboratory (Dstl) This protocol details the use of Hopkinson pressure bars to measure reflected blast loading from near-field explosive events. It is capable of interpolating a pressure-time history at any point on a reflective boundary and as such can be used to fully characterize the spatial and temporal variations in loading produced.