Calculate the optical power of a lens in diopters from its focal length. Optical power is widely used in optometry and eyeglass prescriptions.
Enter your values below
Focal length in meters. 1/f gives power in diopters.
Converging lenses have positive power; diverging have negative.
How this calculator works
Optical power P is the reciprocal of focal length f (in meters). Positive power indicates a converging lens; negative power indicates a diverging lens. Unit is diopter (m^-1).
Common questions about this calculator
These calculators are for educational and informational purposes only. While we strive for accuracy, results should be verified for critical applications. Always consult authoritative sources for engineering or scientific work.
