Diopters to focal length converter
Enter the known value (diopters or focal length) to calculate the other parameter.
Focal Length and Diopters
The optical power of a lens is measured in diopters (or dioptres, in British English).
Optical power is a very useful parameter because when several thin lenses are combined together, the total optical power can be approximately
calculated adding up the optical power of each lens.
To calculate the optical power you only need to divide the focal length in meters by one.