numerical aperturetof-number calculator

The f/# and NA are calculated from the aperture size (or Gaussian 1/e² beam width) and the focal length in air. Known ratios, together with the light wavelength, allow spot size calculations. This calc is accurate to ~2 significant figures.

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f-number calculator

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Numerical aperture formula

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Numerical aperture

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F number to naformula

Results  f Number (f/#)  Numerical Aperture (NA) (um)  Airy Disk Diameter (um)  Gaussian Waist Size (um)  Gaussian FWHM (um)  Rayleigh Length VSWR

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Courtney Dryer, OD, received her doctor of optometry degree from Southern College of Optometry in 2011. She is the owner of Autarchic Spec Shop in Charlotte, NC. She has worked with Eyes on Eyecare since its founding and regularly contributes to optometric publications and vision care websites.

f-number formula

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