diff --git a/extensions/emmet/npm-shrinkwrap.json b/extensions/emmet/npm-shrinkwrap.json
index 17c7ae2718b..eaf2e9b641c 100644
--- a/extensions/emmet/npm-shrinkwrap.json
+++ b/extensions/emmet/npm-shrinkwrap.json
@@ -67,6 +67,11 @@
       "from": "@emmetio/markup-formatters@>=0.3.3 <0.4.0",
       "resolved": "https://registry.npmjs.org/@emmetio/markup-formatters/-/markup-formatters-0.3.3.tgz"
     },
+    "@emmetio/math-expression": {
+      "version": "0.1.1",
+      "from": "@emmetio/math-expression@>=0.1.1 <0.2.0",
+      "resolved": "https://registry.npmjs.org/@emmetio/math-expression/-/math-expression-0.1.1.tgz"
+    },
     "@emmetio/node": {
       "version": "0.1.2",
       "from": "@emmetio/node@>=0.1.2 <0.2.0",
diff --git a/extensions/emmet/package.json b/extensions/emmet/package.json
index f6a6a2f462b..1ae8a6d0ea8 100644
--- a/extensions/emmet/package.json
+++ b/extensions/emmet/package.json
@@ -74,6 +74,7 @@
         "@emmetio/extract-abbreviation": "^0.1.1",
         "@emmetio/html-matcher": "^0.3.1",
         "@emmetio/css-parser": "^0.3.0",
+        "@emmetio/math-expression": "^0.1.1",
         "vscode-emmet-helper":"0.0.6"
     }
 }
\ No newline at end of file
diff --git a/extensions/emmet/src/bufferStream.ts b/extensions/emmet/src/bufferStream.ts
index 923c7d04d0d..261b844c608 100644
--- a/extensions/emmet/src/bufferStream.ts
+++ b/extensions/emmet/src/bufferStream.ts
@@ -15,7 +15,7 @@ export class DocumentStreamReader {
 	private document: TextDocument;
 	private start: Position;
 	private _eof: Position;
-	private pos: Position;
+	public pos: Position;
 	private _eol: string;
 
 	/**
diff --git a/extensions/emmet/src/evaluateMathExpression.ts b/extensions/emmet/src/evaluateMathExpression.ts
new file mode 100644
index 00000000000..b01b6327965
--- /dev/null
+++ b/extensions/emmet/src/evaluateMathExpression.ts
@@ -0,0 +1,32 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import evaluate from '@emmetio/math-expression';
+import { DocumentStreamReader } from './bufferStream';
+
+export function evaluateMathExpression() {
+	let editor = vscode.window.activeTextEditor;
+	if (!editor) {
+		vscode.window.showInformationMessage('No editor is active');
+		return;
+	}
+	const stream = new DocumentStreamReader(editor.document);
+	editor.edit(editBuilder => {
+		editor.selections.forEach(selection => {
+			const pos = selection.isReversed ? selection.anchor : selection.active;
+			stream.pos = pos;
+
+			try {
+				const result = String(evaluate(stream, true));
+				editBuilder.replace(new vscode.Range(stream.pos, pos), result);
+			} catch (err) {
+				// Ignore error since most likely it’s because of non-math expression
+				console.warn('Math evaluation error', err);
+			}
+		});
+	});
+
+}
diff --git a/extensions/emmet/src/extension.ts b/extensions/emmet/src/extension.ts
index fdd0507cbb3..7598f3ccd28 100644
--- a/extensions/emmet/src/extension.ts
+++ b/extensions/emmet/src/extension.ts
@@ -15,6 +15,7 @@ import { mergeLines } from './mergeLines';
 import { toggleComment } from './toggleComment';
 import { fetchEditPoint } from './editPoint';
 import { fetchSelectItem } from './selectItem';
+import { evaluateMathExpression } from './evaluateMathExpression';
 import { LANGUAGE_MODES, getMappedModes } from './util';
 import { updateExtensionsPath } from 'vscode-emmet-helper';
 
@@ -91,6 +92,10 @@ export function activate(context: vscode.ExtensionContext) {
 		fetchSelectItem('prev');
 	}));
 
+	context.subscriptions.push(vscode.commands.registerCommand('emmet.evaluateMathExpression', () => {
+		evaluateMathExpression();
+	}));
+
 	updateExtensionsPath();
 	context.subscriptions.push(vscode.workspace.onDidChangeConfiguration(() => {
 		updateExtensionsPath();
diff --git a/src/vs/workbench/parts/emmet/electron-browser/emmetActions.ts b/src/vs/workbench/parts/emmet/electron-browser/emmetActions.ts
index d136af8f1fa..f048e7c36ed 100644
--- a/src/vs/workbench/parts/emmet/electron-browser/emmetActions.ts
+++ b/src/vs/workbench/parts/emmet/electron-browser/emmetActions.ts
@@ -250,7 +250,8 @@ export abstract class EmmetEditorAction extends EditorAction {
 		'editor.emmet.action.selectPreviousItem': 'emmet.selectPrevItem',
 		'editor.emmet.action.selectNextItem': 'emmet.selectNextItem',
 		'editor.emmet.action.splitJoinTag': 'emmet.splitJoinTag',
-		'editor.emmet.action.toggleComment': 'emmet.toggleComment'
+		'editor.emmet.action.toggleComment': 'emmet.toggleComment',
+		'editor.emmet.action.evaluateMath': 'emmet.evaluateMathExpression'
 	};
 
 	protected emmetActionName: string;