diff --git a/src/ifcopenshell-python/ifcopenshell/util/unit.py b/src/ifcopenshell-python/ifcopenshell/util/unit.py
index 10992888b7..045facdae5 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/unit.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/unit.py
@@ -119,33 +119,34 @@ si_type_names = {
     "VOLUMEUNIT": "CUBIC_METRE",
 }
 
-# Are you good at physics? Want to help fill these in? :)
+# See IfcDimensionalExponents:
+# (Length, Mass, Time, ElectricCurrent, ThermodynamicTemperature, AmountOfSubstance, LuminousIntensity)
 named_dimensions = {
-    # "ABSORBEDDOSEUNIT": (0, 0, 0, 0, 0, 0, 0),
+    "ABSORBEDDOSEUNIT": (2, 0, -2, 0, 0, 0, 0),
     "AMOUNTOFSUBSTANCEUNIT": (0, 0, 0, 0, 0, 1, 0),
     "AREAUNIT": (2, 0, 0, 0, 0, 0, 0),
-    # "DOSEEQUIVALENTUNIT": (0, 0, 0, 0, 0, 0, 0),
-    # "ELECTRICCAPACITANCEUNIT": (0, 0, 0, 0, 0, 0, 0),
-    # "ELECTRICCHARGEUNIT": (0, 0, 0, 0, 0, 0, 0),
-    # "ELECTRICCONDUCTANCEUNIT": (0, 0, 0, 0, 0, 0, 0),
+    "DOSEEQUIVALENTUNIT": (2, 0, -2, 0, 0, 0, 0),
+    "ELECTRICCAPACITANCEUNIT": (-2, -1, 4, 2, 0, 0, 0),
+    "ELECTRICCHARGEUNIT": (0, 0, 1, 1, 0, 0, 0),
+    "ELECTRICCONDUCTANCEUNIT": (-2, -1, 3, 2, 0, 0, 0),
     "ELECTRICCURRENTUNIT": (0, 0, 0, 1, 0, 0, 0),
-    # "ELECTRICRESISTANCEUNIT": (0, 0, 0, 0, 0, 0, 0),
-    # "ELECTRICVOLTAGEUNIT": (0, 0, 0, 0, 0, 0, 0),
+    "ELECTRICRESISTANCEUNIT": (2, 1, -3, -2, 0, 0, 0),
+    "ELECTRICVOLTAGEUNIT": (2, 1, -3, -1, 0, 0, 0),
     "ENERGYUNIT": (2, 1, -2, 0, 0, 0, 0),
     "FORCEUNIT": (1, 1, -2, 0, 0, 0, 0),
     "FREQUENCYUNIT": (0, 0, -1, 0, 0, 0, 0),
-    # "ILLUMINANCEUNIT": (0, 0, 0, 0, 0, 0, 0),
-    # "INDUCTANCEUNIT": (0, 0, 0, 0, 0, 0, 0),
+    "ILLUMINANCEUNIT": (-2, 0, 0, 0, 0, 1, 1),
+    "INDUCTANCEUNIT": (2, 1, -2, -2, 0, 0, 0),
     "LENGTHUNIT": (1, 0, 0, 0, 0, 0, 0),
-    # "LUMINOUSFLUXUNIT": (0, 0, 0, 0, 0, 0, 0),
+    "LUMINOUSFLUXUNIT": (0, 0, 0, 0, 0, 1, 1),
     "LUMINOUSINTENSITYUNIT": (0, 0, 0, 0, 0, 0, 1),
-    # "MAGNETICFLUXDENSITYUNIT": (0, 0, 0, 0, 0, 0, 0),
-    # "MAGNETICFLUXUNIT": (0, 0, 0, 0, 0, 0, 0),
+    "MAGNETICFLUXDENSITYUNIT": (0, 1, -2, -1, 0, 0, 0),
+    "MAGNETICFLUXUNIT": (2, 1, -2, -1, 0, 0, 0),
     "MASSUNIT": (0, 1, 0, 0, 0, 0, 0),
     "PLANEANGLEUNIT": (0, 0, 0, 0, 0, 0, 0),
     "POWERUNIT": (2, 1, -3, 0, 0, 0, 0),
     "PRESSUREUNIT": (-1, 1, -2, 0, 0, 0, 0),
-    # "RADIOACTIVITYUNIT": (0, 0, 0, 0, 0, 0, 0),
+    "RADIOACTIVITYUNIT": (0, 0, -1, 0, 0, 0, 0),
     "SOLIDANGLEUNIT": (0, 0, 0, 0, 0, 0, 0),
     "THERMODYNAMICTEMPERATUREUNIT": (0, 0, 0, 0, 1, 0, 0),
     "TIMEUNIT": (0, 0, 1, 0, 0, 0, 0),