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Aims. Provide a transformation from the standard photometric filters to  Gaia G, G BP  and G RP passbands. Methods. The relations between the standard photometric filters in the Johnson-Cousins  UBV R C  I C photometric system, the SDSS  ugriz  system, and the  Gaia  passbands were fitted with up to third order polynomials for dwarfs and giants individually. Results. At least for the  Gaia G BP passband the Johnson-Cousins filter are better suited for a reliable prediction. No improvement is seen for higher than third order polynomial fits for any of the performed transformations. Conclusions. The provided dependencies amongst colours can be used to transform the apparent magnitudes in the  B, V, R C , and SDSS  griz  passbands to  Gaia G, G BP , and  G BR photometry, allowing for a comparison of the Gaia survey to models of the Galaxy and to previous large surveys.

Transformations from standard photometric systems to the Gaia passbands