This tutorial seeks to equip the learner with the ability to diagnose and quantify aortic and pulmonary valve stenosis using echocardiographic information. Particular attention is directed towards two-dimensional, color-flow and spectral Doppler (pulse and continuous wave). Discussion will include estimation of pressure gradients using the modified Bernoulli equation and calculation of aortic valve area using the continuity equation. Guidelines for grading the severity of aortic and pulmonary valve stenosis are reviewed throughout the learning experience. Finally, learning will include a brief presentation and overview of the echocardiographic assessment of patients after surgical or transcatheter intervention for aortic or pulmonary valve stenosis.