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We derive transformation equations between GALEX and UBV colours by using thereliable data of 556 stars. We present two sets of equations; as a function of(only) luminosity class, and as a function of both luminosity class andmetallicity. The metallicities are provided from the literature, while theluminosity classes are determined by using the PARSEC mass tracks in thisstudy. Small colour residuals and high squared correlation coefficients promiseaccurate derived colours. The application of the transformation equations to 70stars with reliable data shows that the metallicity plays an important role inestimation of more accurate colours.

Bridging the Ultraviolet and Optical Regions: Transformation Equations between {\it GALEX} and {\it UBV} Photometric Systems