FWHM can be determined as the distance between the curve points at the peak half maximum level. On a data graph, draw a vertical line from the peak maximum to the baseline. Measure the length of this line and divide it by 2 to find the center of the line.
The FWHM number is very important if you plan to use the structure as a sensor, specifically, to measure nearby refractive index changes. The thinner the peak the better signal to noise ratio you can achieve, allowing you to detect smaller changes.
The full width at half maximum (FWHM) for a Gaussian is found by finding the half-maximum points .
This video is on multiple peak fitting. By Peak fitting, FWHM can be found which is required for various parameter extraction in XRD, RAMAN, and XPS.

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