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We provide three statistical model prescriptions for the bolometriccorrections appropriate for B-type stars as a function of: 1) T_eff, 2) T_eff,log g, and 3) T_eff, log g, [M/H]. These statistical models have beencalculated for 27 different filters, including those of the Gaia space mission,and were derived based on two different grids of bolometric correctionsassuming LTE and LTE+NLTE, respectively. Previous such work has mainly beenlimited to a single photometric passband without taking into account NLTEeffects on the bolometric corrections. Using these statistical models, wecalculate the luminosities of 34 slowly pulsating B-type (SPB) stars withavailable spectroscopic parameters, to place them in the Hertzsprung-Russelldiagram and compare their position to the theoretical SPB instability strip. Wefind that excluding NLTE effects has no significant impact on the derivedluminosities for the temperature range 11500-21000 K. We conclude thatspectroscopic parameters are needed in order to achieve meaningful luminositiesof B-type stars. The three prescriptions for the bolometric corrections arevalid for any galactic B-type star with effective temperatures and surfacegravities in the ranges 10000-30000 K and 2.5-4.5 dex, respectively, coveringregimes below the Eddington limit.

Recipes for bolometric corrections and Gaia luminosities of B-type stars: Application to an asteroseismic sample