diff --git a/api/fair_ontology.py b/api/fair_ontology.py
index 55577a7..a883c10 100644
--- a/api/fair_ontology.py
+++ b/api/fair_ontology.py
@@ -31,6 +31,8 @@
 QUDT_UNITS: dict[str, str | None] = {
     "CentiM3-PER-MIN": "VolumeFlowRate",
     "L-PER-MIN": "VolumeFlowRate",
+    "M3-PER-SEC": "VolumeFlowRate",
+    "KiloGM-PER-SEC": "MassFlowRate",
     "W": "Power",
     "KiloW": "Power",
     "MilliW": "Power",
@@ -106,6 +108,10 @@
     "slpm": "L-PER-MIN",
     "L/min": "L-PER-MIN",
     "lpm": "L-PER-MIN",
+    "m^3/s": "M3-PER-SEC",
+    "m3/s": "M3-PER-SEC",
+    "m³/s": "M3-PER-SEC",
+    "kg/s": "KiloGM-PER-SEC",
     "W": "W",
     "watt": "W",
     "watts": "W",
diff --git a/api/tests/test_fair_ontology.py b/api/tests/test_fair_ontology.py
index 88b847c..6512fd1 100644
--- a/api/tests/test_fair_ontology.py
+++ b/api/tests/test_fair_ontology.py
@@ -66,6 +66,16 @@ def test_registration_unit_options(self):
         )
         self.assertEqual(infer_qudt("h")["qudt_unit"], QUDT_UNIT_BASE + "HR")
         self.assertEqual(infer_qudt("°")["qudt_unit"], QUDT_UNIT_BASE + "DEG")
+        self.assertEqual(
+            infer_qudt("kg/s"),
+            {"qudt_unit": QUDT_UNIT_BASE + "KiloGM-PER-SEC",
+             "qudt_quantity_kind": QUDT_QK_BASE + "MassFlowRate"},
+        )
+        self.assertEqual(
+            infer_qudt("m^3/s"),
+            {"qudt_unit": QUDT_UNIT_BASE + "M3-PER-SEC",
+             "qudt_quantity_kind": QUDT_QK_BASE + "VolumeFlowRate"},
+        )
 
     def test_ambiguous_and_unknown_units_are_not_guessed(self):
         self.assertEqual(infer_qudt("A"), {})
diff --git a/web/app/equipment/register/page.tsx b/web/app/equipment/register/page.tsx
index 84f93e6..02268c2 100644
--- a/web/app/equipment/register/page.tsx
+++ b/web/app/equipment/register/page.tsx
@@ -45,6 +45,8 @@ const UNIT_OPTIONS = [
   { value: "Pa", label: "Pa" },
   { value: "sccm", label: "sccm" },
   { value: "SLPM", label: "SLPM" },
+  { value: "kg/s", label: "kg/s" },
+  { value: "m^3/s", label: "m^3/s" },
   { value: "V", label: "V" },
   { value: "VDC", label: "VDC" },
   { value: "VRMS", label: "VRMS" },