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We present precise photometric estimates of stellar parameters, includingeffective temperature, metallicity, luminosity classification, distance, andstellar age, for nearly 26 million stars using the methodology developed in thefirst paper of this series, based on the stellar colors from the StellarAbundances and Galactic Evolution Survey (SAGES) DR1 and Gaia EDR3. The optimaldesign of stellar-parameter sensitive $uv$ filters by SAGES has enabled us todetermine photometric-metallicity estimates down to $-3.5$, similar to ourprevious results with the SkyMapper Southern Survey (SMSS), yielding a largesample of over five million metal-poor (MP; [Fe/H]$\le -1.0$) stars and nearlyone million very metal-poor (VMP; [Fe/H]$\le -2.0$) stars. The typicalprecision is around $0.1$ dex for both dwarf and giant stars with[Fe/H]$>-1.0$, and 0.15-0.25/0.3-0.4 dex for dwarf/giant stars with[Fe/H]$<-1.0$. Using the precise parallax measurements and stellar colors fromGaia, effective temperature, luminosity classification, distance and stellarage are further derived for our sample stars. This huge data set in theNorthern sky from SAGES, together with similar data in the Southern sky fromSMSS, will greatly advance our understanding of the Milky Way, in particularits formation and evolution.

Beyond spectroscopy. II. Stellar parameters for over twenty million stars in the northern sky from SAGES DR1 and Gaia DR3