diff --git a/spoolman/database/spool.py b/spoolman/database/spool.py
index ab3bc12..2192b72 100644
--- a/spoolman/database/spool.py
+++ b/spoolman/database/spool.py
@@ -176,6 +176,12 @@ async def find(  # noqa: C901
                     / models.Filament.density
                     / (models.Filament.diameter * models.Filament.diameter),
                 )
+            elif fieldstr == "used_length":
+                sorts.append(
+                    models.Spool.used_weight
+                    / models.Filament.density
+                    / (models.Filament.diameter * models.Filament.diameter),
+                )
             elif fieldstr == "filament.combined_name":
                 sorts.append(models.Vendor.name)
                 sorts.append(models.Filament.name)
diff --git a/tests_integration/tests/spool/test_find.py b/tests_integration/tests/spool/test_find.py
index 22d0be7..51a2758 100644
--- a/tests_integration/tests/spool/test_find.py
+++ b/tests_integration/tests/spool/test_find.py
@@ -223,6 +223,8 @@ def test_find_all_spools_limit_asc_offset_outside_range(spools: Fixture):  # noq
         "filament_id",
         "used_weight",
         "remaining_weight",
+        "used_length",
+        "remaining_length",
         "location",
         "lot_nr",
         "comment",