diff --git a/msg/json/en.json b/msg/json/en.json
index 2ad462e2e8..0cdefd8b4e 100644
--- a/msg/json/en.json
+++ b/msg/json/en.json
@@ -171,6 +171,9 @@
   "OPERATORS_MATHOP_LOG": "log",
   "OPERATORS_MATHOP_EEXP": "e ^",
   "OPERATORS_MATHOP_10EXP": "10 ^",
+  "OPERATORS_CONVERT": "convert %1 to %2",
+  "OPERATORS_CONVERT_DECIMAL": "decimal",
+  "OPERATORS_CONVERT_PERCENT": "percent",
   "PROCEDURES_DEFINITION": "define %1",
   "SENSING_TOUCHINGOBJECT": "touching %1?",
   "SENSING_TOUCHINGOBJECT_POINTER": "mouse-pointer",
diff --git a/src/blocks/math.ts b/src/blocks/math.ts
index efecdf1289..87b4f2e481 100644
--- a/src/blocks/math.ts
+++ b/src/blocks/math.ts
@@ -128,3 +128,32 @@ Blockly.Blocks.math_angle = {
     })
   },
 }
+
+Blockly.Blocks.math_number_convert = {
+  /**
+   * Block for converting a number to a decimal or percentage.
+   */
+  init: function (this: Blockly.Block) {
+    this.jsonInit({
+      message0: 'convert %1 to %2',
+      args0: [
+        {
+          type: 'input_value',
+          name: 'NUM',
+          check: 'Number',
+        },
+        {
+          type: 'field_dropdown',
+          name: 'CONVERT_TYPE',
+          options: [
+            ['decimal', 'DECIMAL'],
+            ['percent', 'PERCENT'],
+          ],
+        },
+      ],
+      output: 'Number',
+      outputShape: Constants.OUTPUT_SHAPE_ROUND,
+      extensions: ['colours_textfield'],
+    })
+  },
+}
diff --git a/src/blocks/operators.ts b/src/blocks/operators.ts
index b54161f496..2f6bf1e04d 100644
--- a/src/blocks/operators.ts
+++ b/src/blocks/operators.ts
@@ -422,3 +422,29 @@ Blockly.Blocks.operator_mathop = {
     })
   },
 }
+
+Blockly.Blocks.operator_convert = {
+  /**
+   * Block for converting a number to a decimal or percentage.
+   */
+  init: function (this: Blockly.Block) {
+    this.jsonInit({
+      message0: Blockly.Msg.OPERATORS_CONVERT,
+      args0: [
+        {
+          type: 'input_value',
+          name: 'NUM',
+        },
+        {
+          type: 'field_dropdown',
+          name: 'CONVERT_TYPE',
+          options: [
+            [Blockly.Msg.OPERATORS_CONVERT_DECIMAL, 'DECIMAL'],
+            [Blockly.Msg.OPERATORS_CONVERT_PERCENT, 'PERCENT'],
+          ],
+        },
+      ],
+      extensions: ['colours_operators', 'output_number'],
+    })
+  },
+}