Generally it is desirable for web based products to have a flat planar shape. Unfortunately coated and laminated products often assume a curved shape. This is a defect commonly called "Curl". The first step in solving most defect problems is an accurate, repeatable and quantifiable measurement system. This paper discusses current curl measurement standards and describes a new measurement method. This method, the Kappa Gauge, which is fast, accurate, inexpensive and eliminates many of the problems of the current measurement standards. The resultant curvature measurement (Kappa) is linear with the moment causing the curl and therefore makes solving curl problems much easier.