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We present an absolute magnitude calibration for red giants with the colourmagnitude diagrams of six Galactic clusters with different metallicities i.e.M92, M13, M3, M71, NGC 6791 and NGC 2158. The combination of the absolutemagnitudes of the red giant sequences with the corresponding metallicitiesprovides calibration for absolute magnitude estimation for red giants for agiven $(g-r)_{0}$ colour. The calibration is defined in the colour interval0.45 $\leq(g-r)_{0}\leq$ 1.30 mag and it covers the metallicity interval$-2.15\leq \lbrack Fe/H \rbrack \leq$ +0.37 dex. The absolute magnituderesiduals obtained by the application of the procedure to another set ofGalactic clusters lie in the interval $-0.28< \Delta M \leq +0.43$ mag.However, the range of 94% of the residuals is shorter, $-0.1<\Delta M \leq+0.4$mag. The mean and the standard deviation of (all) residuals are 0.169 and 0.140mag, respectively. The derived relations are applicable to stars older than 2Gyr, the age of the youngest calibrating cluster.

Absolute Magnitude Calibration for Giants based on the Colour-Magnitude Diagrams of Galactic Clusters. II-Calibration with SDSS