  We measure the bolometric luminosity of a complete and unbiased 12
micron-selected sample of active galactic nuclei (AGN) in the local Universe.
For each galaxy we used a 10-band radio-to-X-ray Spectral Energy Distribution
(SED) to isolate the genuine AGN continuum in each band, including
sub-arcsecond measurements where available, and correcting those contaminated
by the host galaxy. We derive the median SED of Seyfert type 1 AGN, Seyferts
with hidden broad-lines (HBL), Seyferts of type 2, and LINER nuclei in our
sample. The median Seyfert 1 SED shows the characteristic blue bump feature in
the UV, but nevertheless the largest contribution to the bolometric luminosity
comes from the IR and X-ray continua. The median SEDs of both HBL and type 2
AGN are affected by starlight contamination in the optical/UV. The median SED
of HBL AGN is consistent with that of Seyfert 1's, when an extinction of Av =
1.2 mag is applied. The comprehensive SEDs allowed us to measure accurate
bolometric luminosities and derive robust bolometric corrections for the
different tracers. The 12 micron and the K-band nuclear luminosities have good
linear correlations with the bolometric luminosity, similar to those in the
X-rays. We derive bolometric corrections for either continuum bands (K-band, 12
micron, 2-10 keV and 14-195 keV) and narrow emission lines (mid-IR high
ionization lines of [OIV] and [NeV] and optical [OIII]5007A) as well as for
combinations of IR continuum and line emission. A combination of continuum plus
line emission accurately predicts the bolometric luminosity up to quasar
luminosities.
