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SAG Calculator

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Radius of Curvature (mm): Diameter (mm):

Sag (mm): --     

Focal Length Calculator
$$ \text{SAG} = \left| R \right| - \sqrt{R^2 - \left( \frac{D}{2} \right)^2} \approx \frac{D^2}{8 R} $$
R Radius of Curvature
D Diameter
  Paraxial approximation is good for $ \tfrac{D}{2}<<R $
Notes:
  • Please use the American standard for number formatting rather than the European standard (i.e. for "two and a half," enter "2.5" rather than "2,5").

Description

Determine the sag of a surface based on radius of curvature and diameter.

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