Is there any formula to get reflectance from transmittance?

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Bernard Dudley

You also need to know absorptance, which is how much light is absorbed by the material. I believe that these three should add to 1 for a particular wavelength of light on a particular surface. This should be in a physics textbook somewhere.

Sri Rama Koti Ainavarapu

For a non-absorbing and non-magnetic surface, the reflectance = (1- transmittance).

Balaram Mohapatra

for a completely non absorbing material, reflectance= 1-transmittance

Anu Makela

Depends on your material and which wavelengths you are talking about. Visible light, X-rays? As it is check Fresnel equations and Schlick's approximation.