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We present extensive tables of bolometric corrections and interstellarextinction coefficients for the WFPC2 and ACS (both WFC and HRC) photometricsystems. They are derived from synthetic photometry applied to a database ofspectral energy distributions covering a large range of effective temperatures,surface gravity, and metal content. Carbon stars are also considered. Thezero-points take into consideration the new high-accuracy Vega fluxes fromBohlin. These tables are employed to transform Padova isochrones into WFPC2 andACS photometric systems using interstellar extinction coefficients on astar-to-star basis. All data are available either in tabular form or via aninteractive web interface in the case of the isochrones. Preliminary tables forthe WFC3 camera are also included in the database.

Revised bolometric corrections and interstellar extinction coefficients for the ACS and WFPC2 photometric systems