diff --git a/pycraf/conversions/__init__.py b/pycraf/conversions/__init__.py
index b9f51b280..854e9b1d4 100644
--- a/pycraf/conversions/__init__.py
+++ b/pycraf/conversions/__init__.py
@@ -12,7 +12,7 @@
       Unit             Alias         Definition
 ================ ============== ======================================
 |dimless|        dimless        |u|.dimensionless_unscaled
-|dB| = |dBi|     dB = dBi       |u|.dB(dimless)
+|dB|,|dBi|,|dBc| dB, dBi, dBc   |u|.dB(dimless)
 |dBW|            dB_W           |u|.dB(|u|.W)
 |dBW_Hz|         dB_W_Hz        |u|.dB(|u|.W / |u|.Hz)
 |dBW_m2|         dB_W_m2        |u|.dB(|u|.W / |u|.m ** 2)
@@ -30,6 +30,7 @@
 .. |dimless| replace:: :math:`1`
 .. |dB| replace:: :math:`\mathrm{dB}`
 .. |dBi| replace:: :math:`\mathrm{dBi}`
+.. |dBc| replace:: :math:`\mathrm{dBc}`
 .. |dBW| replace:: :math:`\mathrm{dB}[\mathrm{W}]`
 .. |dBW_Hz| replace:: :math:`\mathrm{dB}[\mathrm{W} / \mathrm{Hz}]`
 .. |dBW_m2| replace:: :math:`\mathrm{dB}[\mathrm{W} / \mathrm{m}^2]`
diff --git a/pycraf/conversions/conversions.py b/pycraf/conversions/conversions.py
index 858f81441..c63257283 100644
--- a/pycraf/conversions/conversions.py
+++ b/pycraf/conversions/conversions.py
@@ -15,8 +15,7 @@
 
 UNITS = [
     'dimless',
-    'dB',
-    'dBi',
+    'dB', 'dBi', 'dBc',
     'dB_W',
     'dB_W_Hz',
     'dB_W_m2',
@@ -46,7 +45,7 @@
 # define some useful dB-Scales
 # dimless = apu.Unit(1)
 dimless = apu.dimensionless_unscaled
-dB = dBi = apu.dB(dimless)
+dB = dBi = dBc = apu.dB(dimless)
 dB_W = apu.dB(apu.W)
 dB_W_Hz = apu.dB(apu.W / apu.Hz)
 dB_W_m2 = apu.dB(apu.W / apu.m ** 2)