diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index ac80f43c84c..23baa9119bf 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -123,11 +123,22 @@ namespace ts.server {
 
     export interface FileStats {
         readonly js: number;
+        readonly jsSize?: number;
+
         readonly jsx: number;
+        readonly jsxSize?: number;
+
         readonly ts: number;
+        readonly tsSize?: number;
+
         readonly tsx: number;
+        readonly tsxSize?: number;
+
         readonly dts: number;
+        readonly dtsSize?: number;
+
         readonly deferred: number;
+        readonly deferredSize?: number;
     }
 
     export interface OpenFileInfo {
@@ -1600,7 +1611,7 @@ namespace ts.server {
             setProjectOptionsUsed(project);
             const data: ProjectInfoTelemetryEventData = {
                 projectId: this.host.createSHA256Hash(project.projectName),
-                fileStats: countEachFileTypes(project.getScriptInfos()),
+                fileStats: countEachFileTypes(project.getScriptInfos(), /*includeSizes*/ true),
                 compilerOptions: convertCompilerOptionsForTelemetry(project.getCompilationSettings()),
                 typeAcquisition: convertTypeAcquisition(project.getTypeAcquisition()),
                 extends: projectOptions && projectOptions.configHasExtendsProperty,
diff --git a/src/server/project.ts b/src/server/project.ts
index 7b11f48fbd6..dbfa9100ca4 100644
--- a/src/server/project.ts
+++ b/src/server/project.ts
@@ -10,26 +10,43 @@ namespace ts.server {
     export type Mutable<T> = { -readonly [K in keyof T]: T[K]; };
 
     /* @internal */
-    export function countEachFileTypes(infos: ScriptInfo[]): FileStats {
-        const result: Mutable<FileStats> = { js: 0, jsx: 0, ts: 0, tsx: 0, dts: 0, deferred: 0 };
+    export function countEachFileTypes(infos: ScriptInfo[], includeSizes = false): FileStats {
+        const result: Mutable<FileStats> = { 
+            js: 0, jsSize: 0,
+            jsx: 0, jsxSize: 0,
+            ts: 0, tsSize: 0,
+            tsx: 0, tsxSize: 0,
+            dts: 0, dtsSize: 0,
+            deferred: 0, deferredSize: 0,
+        };
         for (const info of infos) {
+            const fileSize = includeSizes ? info.getTelemetryFileSize() : 0;
             switch (info.scriptKind) {
                 case ScriptKind.JS:
                     result.js += 1;
+                    result.jsSize! += fileSize;
                     break;
                 case ScriptKind.JSX:
                     result.jsx += 1;
+                    result.jsxSize! += fileSize;
                     break;
                 case ScriptKind.TS:
-                    fileExtensionIs(info.fileName, Extension.Dts)
-                        ? result.dts += 1
-                        : result.ts += 1;
+                    if (fileExtensionIs(info.fileName, Extension.Dts)) {
+                        result.dts += 1;
+                        result.dtsSize! += fileSize;
+                    }
+                    else {
+                        result.ts += 1;
+                        result.tsSize! += fileSize;
+                    }
                     break;
                 case ScriptKind.TSX:
                     result.tsx += 1;
+                    result.tsxSize! += fileSize;
                     break;
                 case ScriptKind.Deferred:
                     result.deferred += 1;
+                    result.deferredSize! += fileSize;
                     break;
             }
         }
diff --git a/src/server/scriptInfo.ts b/src/server/scriptInfo.ts
index 9af99ea76ef..defc28f7495 100644
--- a/src/server/scriptInfo.ts
+++ b/src/server/scriptInfo.ts
@@ -316,6 +316,11 @@ namespace ts.server {
             return this.textStorage.version;
         }
 
+        /*@internal*/
+        getTelemetryFileSize() {
+            return this.textStorage.getTelemetryFileSize();
+        }
+
         /*@internal*/
         public isDynamicOrHasMixedContent() {
             return this.hasMixedContent || this.isDynamic;