Context : The ever-growing number of large spectroscopic survey programs has increased the importance of fast and reliable methods with which to determine precise stellar parameters .
Some of these methods are highly dependent on correct spectroscopic calibrations .

Aims : The goal of this work is to obtain a new spectroscopic calibration for a fast estimate of T _ { eff } and [ Fe/H ] for a wide range of stellar spectral types .

Methods : We used spectra from a joint sample of 708 stars , compiled from 451 FGK dwarfs and 257 GK-giant stars .
We used homogeneously determined spectroscopic stellar parameters to derive temperature calibrations using a set of selected EW line-ratios , and [ Fe/H ] calibrations using a set of selected Fe i lines .

Results : We have derived 322 EW line-ratios and 100 Fe i lines that can be used to compute T _ { eff } and [ Fe/H ] , respectively .
We show that these calibrations are effective for FGK dwarfs and GK-giant stars in the following ranges : 4500 K < \mbox { $T _ { eff } $ } < 6500 K , 2.5 < \log g < 4.9 dex , and -0.8 < [ Fe / H ] < 0.5 dex .
The new calibration has a standard deviation of 74 K for T _ { eff } and 0.07 dex for [ Fe/H ] .
We use four independent samples of stars to test and verify the new calibration , a sample of 56 giant stars , a sample composed of Gaia FGK benchmark stars , a sample of 36 GK-giant stars of the DR1 of the Gaia-ESO survey , and a sample of 582 FGK-dwarf stars .
We also provide a new computer code , GeTCal , for automatically producing new calibration files based on any new sample of stars .

Conclusions :