  We present new calibrations of the widely used H_alpha, [OII], and UV
luminosity vs. star formation rate (SFR) relations. Using our evolutionary
synthesis code GALEV we compute the different calibrations for 5 metallicities,
from 1/50 solar up to 2.5 solar. We find significant changes in the
calibrations for lower metallicities compared to the standard calibrations
using solar input physics.
