SAG Calculator | Edmund Optics
SAG Calculator. View All Technical Tools. Radius of Curvature (mm): Diameter (mm): Sag (mm): text{SAG} = R sqrt{R^2 left( frac{D}{2} right)^2} R : Radius of Curvature: D : Diameter: Description. Determine the sag of a surface based on radius of curvature and diameter. Related Product Category: Optical Lenses. View All Now. Was