diff --git a/lib/models/workouts/log.dart b/lib/models/workouts/log.dart
index 18503fb29..291c41fcc 100644
--- a/lib/models/workouts/log.dart
+++ b/lib/models/workouts/log.dart
@@ -93,7 +93,9 @@ class Log {
 
     weight = setConfig.weight;
     weightTarget = setConfig.weight;
-    weightUnitId = setConfig.weightUnitId ?? WEIGHT_UNIT_KG;
+    // Fall back to the resolved unit object (set during routine hydration from
+    // the user's metric preference) when the config carries no explicit unit.
+    weightUnitId = setConfig.weightUnitId ?? setConfig.weightUnit?.id ?? WEIGHT_UNIT_KG;
     weightUnitObj = setConfig.weightUnit;
 
     repetitions = setConfig.repetitions;
diff --git a/lib/models/workouts/set_config_data.dart b/lib/models/workouts/set_config_data.dart
index 38b8e1520..47435945c 100644
--- a/lib/models/workouts/set_config_data.dart
+++ b/lib/models/workouts/set_config_data.dart
@@ -107,7 +107,7 @@ class SetConfigData {
     this.maxNrOfSets,
     this.weight,
     this.maxWeight,
-    this.weightUnitId = WEIGHT_UNIT_KG,
+    this.weightUnitId,
     this.weightRounding,
     this.repetitions,
     this.maxRepetitions,
diff --git a/lib/models/workouts/set_config_data.g.dart b/lib/models/workouts/set_config_data.g.dart
index e415005b7..eba87c76a 100644
--- a/lib/models/workouts/set_config_data.g.dart
+++ b/lib/models/workouts/set_config_data.g.dart
@@ -40,7 +40,7 @@ SetConfigData _$SetConfigDataFromJson(Map<String, dynamic> json) {
     maxNrOfSets: json['max_sets'] as num?,
     weight: stringToNumNull(json['weight'] as String?),
     maxWeight: stringToNumNull(json['max_weight'] as String?),
-    weightUnitId: (json['weight_unit'] as num?)?.toInt() ?? WEIGHT_UNIT_KG,
+    weightUnitId: (json['weight_unit'] as num?)?.toInt(),
     weightRounding: stringToNumNull(json['weight_rounding'] as String?),
     repetitions: stringToNumNull(json['repetitions'] as String?),
     maxRepetitions: stringToNumNull(json['max_repetitions'] as String?),
diff --git a/lib/providers/routines_notifier.dart b/lib/providers/routines_notifier.dart
index effe29130..bcaf133eb 100644
--- a/lib/providers/routines_notifier.dart
+++ b/lib/providers/routines_notifier.dart
@@ -19,6 +19,7 @@
 import 'package:collection/collection.dart';
 import 'package:logging/logging.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:wger/helpers/consts.dart';
 import 'package:wger/models/workouts/day.dart';
 import 'package:wger/models/workouts/day_data.dart';
 import 'package:wger/models/workouts/repetition_unit.dart';
@@ -30,6 +31,7 @@ import 'package:wger/models/workouts/weight_unit.dart';
 import 'package:wger/providers/exercises_notifier.dart';
 import 'package:wger/providers/helpers.dart';
 import 'package:wger/providers/routines_repository.dart';
+import 'package:wger/providers/user_profile_notifier.dart';
 import 'package:wger/providers/workout_session_notifier.dart';
 
 part 'routines_notifier.g.dart';
@@ -111,6 +113,9 @@ class RoutinesRiverpod extends _$RoutinesRiverpod {
     ref.listen(exercisesProvider, (_, _) => _rehydrate());
     ref.listen(routineRepetitionUnitProvider, (_, _) => _rehydrate());
     ref.listen(routineWeightUnitProvider, (_, _) => _rehydrate());
+    // The default weight unit for set configs without an explicit one depends
+    // on the user's metric preference, so re-hydrate when the profile arrives.
+    ref.listen(userProfileProvider, (_, _) => _rehydrate());
 
     return repo.watchAllDrift().map((freshRoutines) {
       final existing = state.value?.routines ?? const <Routine>[];
@@ -140,6 +145,13 @@ class RoutinesRiverpod extends _$RoutinesRiverpod {
     final repetitionUnits =
         ref.read(routineRepetitionUnitProvider).value ?? const <RepetitionUnit>[];
     final weightUnits = ref.read(routineWeightUnitProvider).value ?? const <WeightUnit>[];
+    final profile = ref.read(userProfileProvider).value;
+
+    // Used for set configs that don't carry an explicit weight unit: kg for
+    // metric users, lb otherwise. Defaults to kg while the profile is still
+    // syncing (the profile listener re-hydrates once it arrives).
+    final defaultWeightUnitId = (profile?.isMetric ?? true) ? WEIGHT_UNIT_KG : WEIGHT_UNIT_LB;
+    final defaultWeightUnit = weightUnits.firstWhereOrNull((u) => u.id == defaultWeightUnitId);
 
     routine.sessions = sessions.where((s) => s.routineId == routine.id).toList();
 
@@ -195,9 +207,9 @@ class RoutinesRiverpod extends _$RoutinesRiverpod {
             setConfig.repetitionsUnit = repetitionUnits.firstWhereOrNull(
               (u) => u.id == setConfig.repetitionsUnitId,
             );
-            setConfig.weightUnit = weightUnits.firstWhereOrNull(
-              (u) => u.id == setConfig.weightUnitId,
-            );
+            setConfig.weightUnit = setConfig.weightUnitId != null
+                ? weightUnits.firstWhereOrNull((u) => u.id == setConfig.weightUnitId)
+                : defaultWeightUnit;
           }
         }
       }
diff --git a/lib/providers/routines_notifier.g.dart b/lib/providers/routines_notifier.g.dart
index 7306e7372..d59dca64e 100644
--- a/lib/providers/routines_notifier.g.dart
+++ b/lib/providers/routines_notifier.g.dart
@@ -111,7 +111,7 @@ final class RoutinesRiverpodProvider
   RoutinesRiverpod create() => RoutinesRiverpod();
 }
 
-String _$routinesRiverpodHash() => r'9d6909b714bf367f2976a3ed68dd74ba7b4b7e89';
+String _$routinesRiverpodHash() => r'40ef025119c8a6ad5c13ae5e5d29bf0f6b660780';
 
 abstract class _$RoutinesRiverpod extends $StreamNotifier<RoutinesState> {
   Stream<RoutinesState> build();
diff --git a/test/routine/helpers/routine_form_test_overrides.dart b/test/routine/helpers/routine_form_test_overrides.dart
index 1d5c518da..5d9cf6147 100644
--- a/test/routine/helpers/routine_form_test_overrides.dart
+++ b/test/routine/helpers/routine_form_test_overrides.dart
@@ -26,14 +26,15 @@ import 'package:wger/models/workouts/weight_unit.dart';
 import 'package:wger/providers/exercise_repository.dart';
 import 'package:wger/providers/exercises_notifier.dart';
 import 'package:wger/providers/routines_notifier.dart';
+import 'package:wger/providers/user_profile_repository.dart';
 import 'package:wger/providers/workout_session_repository.dart';
 
 import 'routine_form_test_overrides.mocks.dart';
 
 export 'routine_form_test_overrides.mocks.dart'
-    show MockExerciseRepository, MockWorkoutSessionRepository;
+    show MockExerciseRepository, MockWorkoutSessionRepository, MockUserProfileRepository;
 
-@GenerateMocks([ExerciseRepository, WorkoutSessionRepository])
+@GenerateMocks([ExerciseRepository, WorkoutSessionRepository, UserProfileRepository])
 /// Repository overrides for the two reference-data notifiers that
 /// `RoutinesRiverpod.fetchAndSetRoutineFull` `awaitFirstValue`s on:
 /// `exercisesProvider` and `workoutSessionProvider`. Both notifiers read
@@ -46,15 +47,27 @@ export 'routine_form_test_overrides.mocks.dart'
 List<Override> exerciseAndSessionRepoOverrides({
   MockExerciseRepository? exercise,
   MockWorkoutSessionRepository? session,
+  MockUserProfileRepository? userProfile,
 }) {
   final exerciseRepo = exercise ?? _emptyExerciseRepoMock();
   final sessionRepo = session ?? _emptySessionRepoMock();
   return [
     exerciseRepositoryProvider.overrideWithValue(exerciseRepo),
     workoutSessionRepositoryProvider.overrideWithValue(sessionRepo),
+    // RoutinesRiverpod.build listens to the user profile to pick the default
+    // weight unit; stub it so the real Drift-backed repo isn't pulled in.
+    // Defaults to a null (metric) profile; pass [userProfile] to exercise the
+    // imperial default-unit path.
+    userProfileRepositoryProvider.overrideWithValue(userProfile ?? _emptyUserProfileRepoMock()),
   ];
 }
 
+MockUserProfileRepository _emptyUserProfileRepoMock() {
+  final mock = MockUserProfileRepository();
+  when(mock.watchDrift()).thenAnswer((_) => Stream.value(null));
+  return mock;
+}
+
 MockExerciseRepository _emptyExerciseRepoMock() {
   final mock = MockExerciseRepository();
   when(
@@ -80,10 +93,15 @@ MockWorkoutSessionRepository _emptySessionRepoMock() {
 List<Override> routineFormAmbientOverrides({
   MockExerciseRepository? exercise,
   MockWorkoutSessionRepository? session,
+  MockUserProfileRepository? userProfile,
   List<RepetitionUnit> repetitionUnits = const [],
   List<WeightUnit> weightUnits = const [],
 }) => [
-  ...exerciseAndSessionRepoOverrides(exercise: exercise, session: session),
+  ...exerciseAndSessionRepoOverrides(
+    exercise: exercise,
+    session: session,
+    userProfile: userProfile,
+  ),
   routineRepetitionUnitProvider.overrideWith(
     (ref) => Stream<List<RepetitionUnit>>.value(repetitionUnits),
   ),
diff --git a/test/routine/helpers/routine_form_test_overrides.mocks.dart b/test/routine/helpers/routine_form_test_overrides.mocks.dart
index 66755c555..a6630a98f 100644
--- a/test/routine/helpers/routine_form_test_overrides.mocks.dart
+++ b/test/routine/helpers/routine_form_test_overrides.mocks.dart
@@ -12,9 +12,11 @@ import 'package:wger/models/exercises/category.dart' as _i6;
 import 'package:wger/models/exercises/equipment.dart' as _i8;
 import 'package:wger/models/exercises/exercise_filters.dart' as _i5;
 import 'package:wger/models/exercises/muscle.dart' as _i9;
+import 'package:wger/models/user/user_profile.dart' as _i14;
 import 'package:wger/models/workouts/session.dart' as _i12;
 import 'package:wger/providers/exercise_repository.dart' as _i2;
 import 'package:wger/providers/exercises_notifier.dart' as _i7;
+import 'package:wger/providers/user_profile_repository.dart' as _i13;
 import 'package:wger/providers/workout_session_repository.dart' as _i11;
 
 // ignore_for_file: type=lint
@@ -163,3 +165,29 @@ class MockWorkoutSessionRepository extends _i1.Mock implements _i11.WorkoutSessi
           )
           as _i3.Future<void>);
 }
+
+/// A class which mocks [UserProfileRepository].
+///
+/// See the documentation for Mockito's code generation for more information.
+class MockUserProfileRepository extends _i1.Mock implements _i13.UserProfileRepository {
+  MockUserProfileRepository() {
+    _i1.throwOnMissingStub(this);
+  }
+
+  @override
+  _i3.Stream<_i14.UserProfile?> watchDrift() =>
+      (super.noSuchMethod(
+            Invocation.method(#watchDrift, []),
+            returnValue: _i3.Stream<_i14.UserProfile?>.empty(),
+          )
+          as _i3.Stream<_i14.UserProfile?>);
+
+  @override
+  _i3.Future<void> editLocalDrift(_i14.UserProfile? profile) =>
+      (super.noSuchMethod(
+            Invocation.method(#editLocalDrift, [profile]),
+            returnValue: _i3.Future<void>.value(),
+            returnValueForMissingStub: _i3.Future<void>.value(),
+          )
+          as _i3.Future<void>);
+}
diff --git a/test/routine/models/log_test.dart b/test/routine/models/log_test.dart
index c979b6ae4..f2b72c946 100644
--- a/test/routine/models/log_test.dart
+++ b/test/routine/models/log_test.dart
@@ -1,6 +1,6 @@
 /*
  * This file is part of wger Workout Manager <https://github.com/wger-project>.
- * Copyright (c) 2020, 2025 wger Team
+ * Copyright (c) 2020 - 2026 wger Team
  *
  * wger Workout Manager is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -22,6 +22,7 @@ import 'package:wger/models/exercises/category.dart';
 import 'package:wger/models/exercises/exercise.dart';
 import 'package:wger/models/workouts/log.dart';
 import 'package:wger/models/workouts/set_config_data.dart';
+import 'package:wger/models/workouts/weight_unit.dart';
 
 void main() {
   group('Log.volume', () {
@@ -178,6 +179,24 @@ void main() {
       expect(log.repetitionsUnitId, REP_UNIT_TILL_FAILURE_ID);
     });
 
+    test('derives the unit ID from the resolved unit object when no explicit ID is set', () {
+      // Imperial users: routine hydration leaves weightUnitId null and only
+      // resolves the weightUnit object (lb) from the profile. The log must pick
+      // up lb for *both* the ID and the object
+      const lb = WeightUnit(id: WEIGHT_UNIT_LB, name: 'lb');
+      final setConfig = SetConfigData(
+        exerciseId: 1,
+        slotEntryId: 1,
+        exercise: exercise,
+        weightUnit: lb,
+      );
+
+      final log = Log.fromSetConfigData(setConfig);
+
+      expect(log.weightUnitId, WEIGHT_UNIT_LB);
+      expect(log.weightUnitObj, lb);
+    });
+
     test('copies weight and repetitions values', () {
       final setConfig = SetConfigData(
         exerciseId: 1,
diff --git a/test/routine/routine_form_test.dart b/test/routine/routine_form_test.dart
index e7029be6c..516d52af9 100644
--- a/test/routine/routine_form_test.dart
+++ b/test/routine/routine_form_test.dart
@@ -36,6 +36,7 @@ import 'package:wger/providers/exercises_notifier.dart';
 import 'package:wger/providers/network_provider.dart';
 import 'package:wger/providers/routines_notifier.dart';
 import 'package:wger/providers/routines_repository.dart';
+import 'package:wger/providers/user_profile_repository.dart';
 import 'package:wger/providers/workout_session_repository.dart';
 import 'package:wger/screens/routine_edit_screen.dart';
 import 'package:wger/screens/routine_screen.dart';
@@ -46,13 +47,19 @@ import '../../test_data/routines.dart';
 import '../fake_connectivity.dart';
 import './routine_form_test.mocks.dart';
 
-@GenerateMocks([RoutinesRepository, WorkoutSessionRepository, ExerciseRepository])
+@GenerateMocks([
+  RoutinesRepository,
+  WorkoutSessionRepository,
+  ExerciseRepository,
+  UserProfileRepository,
+])
 void main() {
   installFakeConnectivity();
 
   late MockRoutinesRepository mockRoutinesRepository;
   late MockWorkoutSessionRepository mockSessionRepo;
   late MockExerciseRepository mockExerciseRepo;
+  late MockUserProfileRepository mockUserProfileRepo;
   late StreamController<List<Routine>> routineStream;
   late Routine existingRoutine;
   late Routine newRoutine;
@@ -92,6 +99,10 @@ void main() {
     when(
       mockExerciseRepo.watchAllDrift(),
     ).thenAnswer((_) => Stream.value(const ExerciseState(<Exercise>[])));
+    // RoutinesRiverpod.build() also listens to the user profile for the default
+    // weight unit; stub it so the real PowerSync DB isn't pulled in.
+    mockUserProfileRepo = MockUserProfileRepository();
+    when(mockUserProfileRepo.watchDrift()).thenAnswer((_) => Stream.value(null));
   });
 
   tearDown(() {
@@ -106,6 +117,7 @@ void main() {
         routinesRepositoryProvider.overrideWithValue(mockRoutinesRepository),
         workoutSessionRepositoryProvider.overrideWithValue(mockSessionRepo),
         exerciseRepositoryProvider.overrideWithValue(mockExerciseRepo),
+        userProfileRepositoryProvider.overrideWithValue(mockUserProfileRepo),
         networkStatusProvider.overrideWithValue(isOnline),
         routineRepetitionUnitProvider.overrideWith(
           (ref) => Stream<List<RepetitionUnit>>.value(testRepetitionUnits),
diff --git a/test/routine/routine_form_test.mocks.dart b/test/routine/routine_form_test.mocks.dart
index e4c05df24..6130e7f5b 100644
--- a/test/routine/routine_form_test.mocks.dart
+++ b/test/routine/routine_form_test.mocks.dart
@@ -12,6 +12,7 @@ import 'package:wger/models/exercises/category.dart' as _i16;
 import 'package:wger/models/exercises/equipment.dart' as _i18;
 import 'package:wger/models/exercises/exercise_filters.dart' as _i15;
 import 'package:wger/models/exercises/muscle.dart' as _i19;
+import 'package:wger/models/user/user_profile.dart' as _i22;
 import 'package:wger/models/workouts/base_config.dart' as _i6;
 import 'package:wger/models/workouts/day.dart' as _i3;
 import 'package:wger/models/workouts/repetition_unit.dart' as _i10;
@@ -23,6 +24,7 @@ import 'package:wger/models/workouts/weight_unit.dart' as _i9;
 import 'package:wger/providers/exercise_repository.dart' as _i13;
 import 'package:wger/providers/exercises_notifier.dart' as _i17;
 import 'package:wger/providers/routines_repository.dart' as _i7;
+import 'package:wger/providers/user_profile_repository.dart' as _i21;
 import 'package:wger/providers/workout_session_repository.dart' as _i11;
 
 // ignore_for_file: type=lint
@@ -409,3 +411,29 @@ class MockExerciseRepository extends _i1.Mock implements _i13.ExerciseRepository
           )
           as _i8.Stream<List<_i20.Language>>);
 }
+
+/// A class which mocks [UserProfileRepository].
+///
+/// See the documentation for Mockito's code generation for more information.
+class MockUserProfileRepository extends _i1.Mock implements _i21.UserProfileRepository {
+  MockUserProfileRepository() {
+    _i1.throwOnMissingStub(this);
+  }
+
+  @override
+  _i8.Stream<_i22.UserProfile?> watchDrift() =>
+      (super.noSuchMethod(
+            Invocation.method(#watchDrift, []),
+            returnValue: _i8.Stream<_i22.UserProfile?>.empty(),
+          )
+          as _i8.Stream<_i22.UserProfile?>);
+
+  @override
+  _i8.Future<void> editLocalDrift(_i22.UserProfile? profile) =>
+      (super.noSuchMethod(
+            Invocation.method(#editLocalDrift, [profile]),
+            returnValue: _i8.Future<void>.value(),
+            returnValueForMissingStub: _i8.Future<void>.value(),
+          )
+          as _i8.Future<void>);
+}
diff --git a/test/routine/routines_provider_test.dart b/test/routine/routines_provider_test.dart
index 5a509bc8f..61f27d65e 100644
--- a/test/routine/routines_provider_test.dart
+++ b/test/routine/routines_provider_test.dart
@@ -22,15 +22,20 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/annotations.dart';
 import 'package:mockito/mockito.dart';
 import 'package:wger/models/exercises/exercise.dart';
+import 'package:wger/models/user/user_profile.dart';
 import 'package:wger/models/workouts/day.dart';
+import 'package:wger/models/workouts/day_data.dart';
 import 'package:wger/models/workouts/log.dart';
 import 'package:wger/models/workouts/routine.dart';
 import 'package:wger/models/workouts/session.dart';
+import 'package:wger/models/workouts/set_config_data.dart';
 import 'package:wger/models/workouts/slot.dart';
+import 'package:wger/models/workouts/slot_data.dart';
 import 'package:wger/models/workouts/slot_entry.dart';
 import 'package:wger/providers/exercises_notifier.dart';
 import 'package:wger/providers/routines_notifier.dart';
 import 'package:wger/providers/routines_repository.dart';
+import 'package:wger/providers/user_profile_notifier.dart';
 
 import '../../test_data/exercises.dart';
 import '../../test_data/routines.dart';
@@ -359,6 +364,60 @@ void main() {
       // Assert: `_fullFetchInFlight` collapses them into a single roundtrip.
       verify(mockRepo.fetchAndSetRoutineFullServer(101)).called(1);
     });
+
+    test('resolves the default weight unit from an imperial profile', () async {
+      // A set config without an explicit weight unit must inherit the unit
+      // implied by the profile: lb (id 2) for an imperial user, not kg.
+      overrideStreams(mockExerciseRepo);
+      final setConfig = SetConfigData(
+        exerciseId: 1,
+        slotEntryId: 1,
+        exercise: getTestExercises()[0],
+        // No weightUnit / weightUnitId: the server omits it, the default applies.
+      );
+      final routine = Routine(id: 101, name: 'Test routine')
+        ..dayDataGym = [
+          DayData(
+            iteration: 1,
+            date: DateTime(2024, 11, 1),
+            label: '',
+            day: Day(id: 1, routineId: 101, name: 'Test', order: 1),
+            slots: [
+              SlotData(comment: '', isSuperset: false, exerciseIds: [1], setConfigs: [setConfig]),
+            ],
+          ),
+        ];
+      when(mockRepo.fetchAndSetRoutineFullServer(101)).thenAnswer((_) async => routine);
+
+      final imperialProfileRepo = MockUserProfileRepository();
+      when(
+        imperialProfileRepo.watchDrift(),
+      ).thenAnswer((_) => Stream.value(UserProfile(id: 1, weightUnitStr: 'lb')));
+
+      final container = ProviderContainer.test(
+        overrides: [
+          routinesRepositoryProvider.overrideWithValue(mockRepo),
+          ...routineFormAmbientOverrides(
+            exercise: mockExerciseRepo,
+            session: mockSessionRepo,
+            userProfile: imperialProfileRepo,
+            repetitionUnits: testRepetitionUnits,
+            weightUnits: testWeightUnits,
+          ),
+        ],
+      );
+
+      // fetchAndSetRoutineFull doesn't await the profile, so keep it alive and
+      // let its stream emit before hydration reads it (post-sync steady state).
+      container.listen(userProfileProvider, (_, _) {});
+      await pumpEventQueue();
+      final notifier = container.read(routinesRiverpodProvider.notifier);
+      final result = await notifier.fetchAndSetRoutineFull(101);
+
+      // testWeightUnit2 has id 2 == WEIGHT_UNIT_LB.
+      final hydratedConfig = result.dayDataGym[0].slots[0].setConfigs[0];
+      expect(hydratedConfig.weightUnit, testWeightUnit2);
+    });
   });
 
   group('routineHydration family', () {