diff --git a/lib/customEvents.js b/lib/customEvents.js
index bee44f5b4..42afb119d 100644
--- a/lib/customEvents.js
+++ b/lib/customEvents.js
@@ -77,4 +77,8 @@ function enrich(beacon: CustomEventBeacon, opts: CustomEventOptions) {
   if (typeof opts['componentStack'] === 'string') {
     beacon['cs'] = opts['componentStack'].substring(0, 4096);
   }
-}
+
+  if (typeof opts['customMetric'] === 'number') {
+    beacon['cm'] = opts['customMetric'];
+  }
+} 
diff --git a/lib/types.js b/lib/types.js
index b8b0e569d..01fa7c2bf 100644
--- a/lib/types.js
+++ b/lib/types.js
@@ -241,7 +241,10 @@ export interface CustomEventBeacon extends Beacon {
   // error stack
   st: ?string,
   // component stack
-  cs: ?string
+  cs: ?string,
+
+  //custom metric
+  cm: ?number
 }
 
 export interface CustomEventOptions {
@@ -265,7 +268,10 @@ export interface CustomEventOptions {
 
   // to permit ['foo'] based access that doesn't break
   // when pushed through the Closure compiler
-  [key: string]: any
+  [key: string]: any,
+
+  // Any custom metric that can be passed with custom events Example: 123.2342
+  customMetric: ?number
 }
 
 export interface PageChangeBeacon extends Beacon {
diff --git a/test/e2e/09_customEvents/customEvents.spec.js b/test/e2e/09_customEvents/customEvents.spec.js
index ff80e1504..17cb3d354 100644
--- a/test/e2e/09_customEvents/customEvents.spec.js
+++ b/test/e2e/09_customEvents/customEvents.spec.js
@@ -35,6 +35,7 @@ describe('09_customEvents', () => {
             cexpect(beacon.m_kind).to.equal('experienced');
             cexpect(beacon.m_state).to.equal('broken');
             cexpect(beacon.bt).to.equal('ab87128a1ff99345');
+            cexpect(beacon.cm).to.equal('123.2342');
           });
         });
       });
@@ -83,4 +84,60 @@ describe('09_customEvents', () => {
       });
     });
   });
+
+  describe('simpleEventReportingWithoutCustomMetric', () => {
+    beforeEach(() => {
+      browser.get(getE2ETestBaseUrl('09_customEvents/simpleEventReportingWithoutCustomMetric'));
+    });
+
+    it('must report custom events', () => {
+      return retry(() => {
+        return getBeacons().then(beacons => {
+          const pageLoadBeacon = expectOneMatching(beacons, beacon => {
+            cexpect(beacon.ty).to.equal('pl');
+          });
+
+          expectOneMatching(beacons, beacon => {
+            cexpect(beacon.ty).to.equal('cus');
+            cexpect(beacon.ts).to.be.a('string');
+            cexpect(beacon.n).to.equal('testWithEmptyCustomMetric');
+            cexpect(beacon.e).to.match(/Testing 123/);
+            cexpect(beacon.pl).to.equal(pageLoadBeacon.t);
+            cexpect(beacon.bt).to.equal('ab87128a1ff99345');
+            cexpect(beacon.cm).to.be.undefined;
+          });
+
+          expectOneMatching(beacons, beacon => {
+            cexpect(beacon.ty).to.equal('cus');
+            cexpect(beacon.ts).to.be.a('string');
+            cexpect(beacon.n).to.equal('testWithNoCustomMetric');
+            cexpect(beacon.e).to.match(/something wrong/);
+            cexpect(beacon.pl).to.equal(pageLoadBeacon.t);
+            cexpect(beacon.bt).to.equal('ab87128a1ff99345');
+            cexpect(beacon.cm).to.be.undefined;
+          });
+
+          expectOneMatching(beacons, beacon => {
+            cexpect(beacon.ty).to.equal('cus');
+            cexpect(beacon.ts).to.be.a('string');
+            cexpect(beacon.n).to.equal('testWithIncorrectCustomMetric');
+            cexpect(beacon.e).to.match(/something wrong/);
+            cexpect(beacon.pl).to.equal(pageLoadBeacon.t);
+            cexpect(beacon.bt).to.equal('ab87128a1ff99345');
+            cexpect(beacon.cm).to.be.undefined;
+          });
+
+          expectOneMatching(beacons, beacon => {
+            cexpect(beacon.ty).to.equal('cus');
+            cexpect(beacon.ts).to.be.a('string');
+            cexpect(beacon.n).to.equal('testWithExponentialCustomMetric(1e5)');
+            cexpect(beacon.e).to.match(/something wrong/);
+            cexpect(beacon.pl).to.equal(pageLoadBeacon.t);
+            cexpect(beacon.bt).to.equal('ab87128a1ff99345');
+            cexpect(beacon.cm).to.equal('100000');
+          });
+        });
+      });
+    });
+  });
 });
diff --git a/test/e2e/09_customEvents/simpleEventReporting.html b/test/e2e/09_customEvents/simpleEventReporting.html
index 0aa90c2b6..f33478712 100644
--- a/test/e2e/09_customEvents/simpleEventReporting.html
+++ b/test/e2e/09_customEvents/simpleEventReporting.html
@@ -20,7 +20,8 @@
         // one-off overwrite
         kind: 'experienced',
         state: 'broken'
-      }
+      },
+      customMetric: 123.2342
     });
   </script>
   <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
diff --git a/test/e2e/09_customEvents/simpleEventReportingWithoutCustomMetric.html b/test/e2e/09_customEvents/simpleEventReportingWithoutCustomMetric.html
new file mode 100644
index 000000000..c8eac9d77
--- /dev/null
+++ b/test/e2e/09_customEvents/simpleEventReportingWithoutCustomMetric.html
@@ -0,0 +1,69 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>error test</title>
+
+  <script src="/e2e/initializer.js"></script>
+  <script crossorigin="anonymous" defer src="/target/eum.min.js"></script>
+  <script>
+    eum('meta', 'name', 'Tom');
+    eum('meta', 'age', 23);
+    eum('meta', 'kind', 'newbie');
+
+    eum('reportEvent', 'testWithEmptyCustomMetric', {
+      duration: 42,
+      backendTraceId: 'ab87128a1ff99345',
+      error: new Error('Testing 123'),
+      componentStack: 'a component stack',
+      meta: {
+        // one-off overwrite
+        kind: 'experienced',
+        state: 'broken'
+      },
+      customMetric: null
+    });
+    eum('reportEvent', 'testWithNoCustomMetric', {
+      duration: 2,
+      backendTraceId: 'ab87128a1ff99345',
+      error: new Error('something wrong'),
+      componentStack: 'some stack',
+      meta: {
+        // one-off overwrite
+        kind: 'experienced',
+        state: 'broken'
+      }
+    });
+    eum('reportEvent', 'testWithIncorrectCustomMetric', {
+      duration: 2,
+      backendTraceId: 'ab87128a1ff99345',
+      error: new Error('something wrong'),
+      componentStack: 'some stack',
+      meta: {
+        // one-off overwrite
+        kind: 'experienced',
+        state: 'broken'
+      },
+      customMetric: 'some string'
+    });
+    eum('reportEvent', 'testWithExponentialCustomMetric(1e5)', {
+      duration: 2,
+      backendTraceId: 'ab87128a1ff99345',
+      error: new Error('something wrong'),
+      componentStack: 'some stack',
+      meta: {
+        // one-off overwrite
+        kind: 'experienced',
+        state: 'broken'
+      },
+      customMetric: 1e5
+    });
+  </script>
+  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
+  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.js"></script>
+</head>
+<body>
+  simple event reporting without proper CustomMetric
+</body>
+</html>