diff --git a/packages/angular_devkit/build_angular/src/angular-cli-files/utilities/bundle-calculator.ts b/packages/angular_devkit/build_angular/src/angular-cli-files/utilities/bundle-calculator.ts
index 810899e0d8..a396b2f380 100644
--- a/packages/angular_devkit/build_angular/src/angular-cli-files/utilities/bundle-calculator.ts
+++ b/packages/angular_devkit/build_angular/src/angular-cli-files/utilities/bundle-calculator.ts
@@ -64,6 +64,7 @@ class InitialCalculator extends Calculator {
     const initialChunks = this.compilation.chunks.filter(chunk => chunk.isOnlyInitial());
     const size: number = initialChunks
       .reduce((files, chunk) => [...files, ...chunk.files], [])
+      .filter((file: string) => !file.endsWith('.map'))
       .map((file: string) => this.compilation.assets[file].size())
       .reduce((total: number, size: number) => total + size, 0);
     return [{size, label: 'initial'}];
@@ -76,7 +77,7 @@ class InitialCalculator extends Calculator {
 class AllScriptCalculator extends Calculator {
   calculate() {
     const size: number = Object.keys(this.compilation.assets)
-      .filter(key => /\.js$/.test(key))
+      .filter(key => key.endsWith('.js'))
       .map(key => this.compilation.assets[key])
       .map(asset => asset.size())
       .reduce((total: number, size: number) => total + size, 0);
@@ -90,6 +91,7 @@ class AllScriptCalculator extends Calculator {
 class AllCalculator extends Calculator {
   calculate() {
     const size: number = Object.keys(this.compilation.assets)
+      .filter(key => !key.endsWith('.map'))
       .map(key => this.compilation.assets[key].size())
       .reduce((total: number, size: number) => total + size, 0);
     return [{size, label: 'total'}];
@@ -102,7 +104,7 @@ class AllCalculator extends Calculator {
 class AnyScriptCalculator extends Calculator {
   calculate() {
     return Object.keys(this.compilation.assets)
-      .filter(key => /\.js$/.test(key))
+      .filter(key => key.endsWith('.js'))
       .map(key => {
         const asset = this.compilation.assets[key];
         return {
@@ -119,6 +121,7 @@ class AnyScriptCalculator extends Calculator {
 class AnyCalculator extends Calculator {
   calculate() {
     return Object.keys(this.compilation.assets)
+      .filter(key => !key.endsWith('.map'))
       .map(key => {
         const asset = this.compilation.assets[key];
         return {
diff --git a/packages/angular_devkit/build_angular/test/browser/bundle-budgets_spec_large.ts b/packages/angular_devkit/build_angular/test/browser/bundle-budgets_spec_large.ts
index 918e691ba7..56eb019a5e 100644
--- a/packages/angular_devkit/build_angular/test/browser/bundle-budgets_spec_large.ts
+++ b/packages/angular_devkit/build_angular/test/browser/bundle-budgets_spec_large.ts
@@ -54,4 +54,39 @@ describe('Browser Builder bundle budgets', () => {
       tap(() => expect(logger.includes('WARNING')).toBe(true)),
     ).toPromise().then(done, done.fail);
   });
+
+  describe(`should ignore '.map' files`, () => {
+    it(`when 'intial' budget`, (done) => {
+      const overrides = {
+        optimization: true,
+        budgets: [{ type: 'initial', maximumError: '1mb' }],
+      };
+
+      runTargetSpec(host, browserTargetSpec, overrides, DefaultTimeout * 2).pipe(
+        tap((buildEvent) => expect(buildEvent.success).toBe(true)),
+      ).toPromise().then(done, done.fail);
+    });
+
+    it(`when 'all' budget`, (done) => {
+      const overrides = {
+        optimization: true,
+        budgets: [{ type: 'all', maximumError: '1mb' }],
+      };
+
+      runTargetSpec(host, browserTargetSpec, overrides, DefaultTimeout * 2).pipe(
+        tap((buildEvent) => expect(buildEvent.success).toBe(true)),
+      ).toPromise().then(done, done.fail);
+    });
+
+    it(`when 'any' budget`, (done) => {
+      const overrides = {
+        optimization: true,
+        budgets: [{ type: 'any', maximumError: '1mb' }],
+      };
+
+      runTargetSpec(host, browserTargetSpec, overrides, DefaultTimeout * 2).pipe(
+        tap((buildEvent) => expect(buildEvent.success).toBe(true)),
+      ).toPromise().then(done, done.fail);
+    });
+  });
 });