diff --git a/api/lib/src/models/tool.dart b/api/lib/src/models/tool.dart
index b7c4875ebf25..c6116175fb82 100644
--- a/api/lib/src/models/tool.dart
+++ b/api/lib/src/models/tool.dart
@@ -196,6 +196,7 @@ sealed class Tool with _$Tool {
     @Default('') String name,
     @Default('') String displayIcon,
     @ColorJsonConverter() SRGBColor? color,
+    @Default(100) int size,
   }) = RulerTool;
 
   factory Tool.grid({
diff --git a/api/lib/src/models/tool.freezed.dart b/api/lib/src/models/tool.freezed.dart
index b7f09f735a68..e34fc9f55cea 100644
--- a/api/lib/src/models/tool.freezed.dart
+++ b/api/lib/src/models/tool.freezed.dart
@@ -2799,7 +2799,8 @@ abstract class _$$RulerToolImplCopyWith<$Res> implements $ToolCopyWith<$Res> {
   $Res call(
       {String name,
       String displayIcon,
-      @ColorJsonConverter() SRGBColor? color});
+      @ColorJsonConverter() SRGBColor? color,
+      int size});
 }
 
 /// @nodoc
@@ -2818,6 +2819,7 @@ class __$$RulerToolImplCopyWithImpl<$Res>
     Object? name = null,
     Object? displayIcon = null,
     Object? color = freezed,
+    Object? size = null,
   }) {
     return _then(_$RulerToolImpl(
       name: null == name
@@ -2832,6 +2834,10 @@ class __$$RulerToolImplCopyWithImpl<$Res>
           ? _value.color
           : color // ignore: cast_nullable_to_non_nullable
               as SRGBColor?,
+      size: null == size
+          ? _value.size
+          : size // ignore: cast_nullable_to_non_nullable
+              as int,
     ));
   }
 }
@@ -2843,6 +2849,7 @@ class _$RulerToolImpl extends RulerTool {
       {this.name = '',
       this.displayIcon = '',
       @ColorJsonConverter() this.color,
+      this.size = 100,
       final String? $type})
       : $type = $type ?? 'ruler',
         super._();
@@ -2859,13 +2866,16 @@ class _$RulerToolImpl extends RulerTool {
   @override
   @ColorJsonConverter()
   final SRGBColor? color;
+  @override
+  @JsonKey()
+  final int size;
 
   @JsonKey(name: 'type')
   final String $type;
 
   @override
   String toString() {
-    return 'Tool.ruler(name: $name, displayIcon: $displayIcon, color: $color)';
+    return 'Tool.ruler(name: $name, displayIcon: $displayIcon, color: $color, size: $size)';
   }
 
   /// Create a copy of Tool
@@ -2888,7 +2898,8 @@ abstract class RulerTool extends Tool {
   factory RulerTool(
       {final String name,
       final String displayIcon,
-      @ColorJsonConverter() final SRGBColor? color}) = _$RulerToolImpl;
+      @ColorJsonConverter() final SRGBColor? color,
+      final int size}) = _$RulerToolImpl;
   RulerTool._() : super._();
 
   factory RulerTool.fromJson(Map<String, dynamic> json) =
@@ -2900,6 +2911,7 @@ abstract class RulerTool extends Tool {
   String get displayIcon;
   @ColorJsonConverter()
   SRGBColor? get color;
+  int get size;
 
   /// Create a copy of Tool
   /// with the given fields replaced by the non-null parameter values.
diff --git a/api/lib/src/models/tool.g.dart b/api/lib/src/models/tool.g.dart
index d8aca3cbe3fc..d53ab1358406 100644
--- a/api/lib/src/models/tool.g.dart
+++ b/api/lib/src/models/tool.g.dart
@@ -430,6 +430,7 @@ _$RulerToolImpl _$$RulerToolImplFromJson(Map json) => _$RulerToolImpl(
       displayIcon: json['displayIcon'] as String? ?? '',
       color: _$JsonConverterFromJson<int, SRGBColor>(
           json['color'], const ColorJsonConverter().fromJson),
+      size: (json['size'] as num?)?.toInt() ?? 100,
       $type: json['type'] as String?,
     );
 
@@ -439,6 +440,7 @@ Map<String, dynamic> _$$RulerToolImplToJson(_$RulerToolImpl instance) =>
       'displayIcon': instance.displayIcon,
       'color': _$JsonConverterToJson<int, SRGBColor>(
           instance.color, const ColorJsonConverter().toJson),
+      'size': instance.size,
       'type': instance.$type,
     };
 
diff --git a/app/lib/handlers/ruler.dart b/app/lib/handlers/ruler.dart
index 2021b1fdc747..898a31aff150 100644
--- a/app/lib/handlers/ruler.dart
+++ b/app/lib/handlers/ruler.dart
@@ -1,14 +1,13 @@
 part of 'handler.dart';
 
-Rect _getRulerRect(Size size, Offset position,
+Rect _getRulerRect(RulerTool ruler, Size size, Offset position,
     [CameraTransform transform = const CameraTransform()]) {
-  const rulerSize = 100.0;
   return Rect.fromLTWH(
     transform.position.dx + position.dx / transform.size,
     transform.position.dy +
-        (size.height / 2 + -rulerSize / 2 + position.dy) / transform.size,
+        (size.height / 2 + -ruler.size / 2 + position.dy) / transform.size,
     size.width * 2 / transform.size,
-    rulerSize / transform.size,
+    ruler.size / transform.size,
   );
 }
 
@@ -50,7 +49,7 @@ class RulerHandler extends Handler<RulerTool> with PointerManipulationHandler {
 
   Rect getRect(Size size,
       [CameraTransform transform = const CameraTransform()]) {
-    return _getRulerRect(size, _position, transform);
+    return _getRulerRect(data, size, _position, transform);
   }
 
   bool isPointerInside(Offset position, Size viewportSize) {
@@ -111,7 +110,7 @@ class RulerRenderer extends Renderer<RulerTool> {
     canvas.save();
     canvas.translate(transform.position.dx, transform.position.dy);
     canvas.scale(1 / transform.size, 1 / transform.size);
-    var rulerRect = _getRulerRect(size, position);
+    var rulerRect = _getRulerRect(element, size, position);
     final rulerCenter = rulerRect.center;
     canvas.translate(rulerCenter.dx, rulerCenter.dy);
     canvas.rotate(rulerRotation * pi / 180);
diff --git a/app/lib/l10n/app_en.arb b/app/lib/l10n/app_en.arb
index fdfd0819fb25..3c4397a1db5d 100644
--- a/app/lib/l10n/app_en.arb
+++ b/app/lib/l10n/app_en.arb
@@ -636,5 +636,5 @@
   "confirmPassword": "Confirm password",
   "passwordMismatch": "The passwords do not match",
   "action": "Action",
-  "svgText": "SVG text"
+  "svgText": "SVG Text"
 }
diff --git a/app/lib/selections/tools/ruler.dart b/app/lib/selections/tools/ruler.dart
index dab240fac245..f56b46fe5751 100644
--- a/app/lib/selections/tools/ruler.dart
+++ b/app/lib/selections/tools/ruler.dart
@@ -28,6 +28,18 @@ class RulerToolSelection extends ToolSelection<RulerTool> {
           selected.map((e) => e.copyWith(color: value)).toList(),
         ),
       ),
+      ExactSlider(
+        header: Text(AppLocalizations.of(context).size),
+        value: selected.first.size.toDouble(),
+        min: 1,
+        max: 500,
+        defaultValue: 100,
+        fractionDigits: 0,
+        onChangeEnd: (value) => update(
+          context,
+          selected.map((e) => e.copyWith(size: value.toInt())).toList(),
+        ),
+      )
     ];
   }