An apparatus for estimating a concentration of an analyte may include a processor configured to measure a first scattering coefficient of an object at a first wavelength and a second scattering coefficient of the object at a second wavelength, obtain a third scattering coefficient of the object at the third wavelength based on the first scattering coefficient and the second scattering coefficient, measure reflectance of the object at a third wavelength, and estimate the concentration of the analyte based on the obtained third scattering coefficient and the measured reflectance.
