How to calculate crystallites (grain) size using scherrer equation from XRD data

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How to calculate crystallite size and average crystallites size from XRD data
The crystallite size, D, has been calculated by applying Scherrer’s equation as:
D=kλ/βcos⁡θ
Where
k =0.95-0.98 shape factor
λ=0.154 nm (X-ray wavelength
β= half-width of the diffraction band (FWHM) (radians
θ = Bragg- diffraction angle (peak position in radians