diff --git a/lib/parsers/index.ts b/lib/parsers/index.ts
index dd201742..2c3a564d 100644
--- a/lib/parsers/index.ts
+++ b/lib/parsers/index.ts
@@ -30,6 +30,7 @@ export interface PkgTree {
   hasDevDependencies?: boolean;
   cyclic?: boolean;
   missingLockFileEntry?: boolean;
+  size?: number;
 }
 
 export enum DepType {
diff --git a/lib/parsers/package-lock-parser.ts b/lib/parsers/package-lock-parser.ts
index 25b3ffae..35c0523a 100644
--- a/lib/parsers/package-lock-parser.ts
+++ b/lib/parsers/package-lock-parser.ts
@@ -75,6 +75,7 @@ export class PackageLockParser implements LockfileParser {
       dependencies: {},
       hasDevDependencies: !_.isEmpty(manifestFile.devDependencies),
       name: manifestFile.name,
+      size: 1,
       version: manifestFile.version || '',
     };
 
@@ -104,10 +105,14 @@ export class PackageLockParser implements LockfileParser {
     }
 
     // transform depMap to a map of PkgTrees
-    const depTrees: {[depPath: string]: PkgTree} = await this.createDepTrees(depMap, depGraph);
+    const {depTrees, depTreesSizes} = await this.createDepTrees(depMap, depGraph);
 
     // get trees for dependencies from manifest file
     const topLevelDeps: Dep[] = getTopLevelDeps(manifestFile, includeDev);
+
+    // number of dependencies including root one
+    let treeSize = 1;
+
     for (const dep of topLevelDeps) {
       // if any of top level dependencies is a part of cycle
       // it now has a different item in the map
@@ -116,9 +121,11 @@ export class PackageLockParser implements LockfileParser {
         // if the top level dependency is dev, all children are dev
         depTree.dependencies[dep.name] = dep.dev ?
           this.setDevDepRec(_.cloneDeep(depTrees[depName])) : depTrees[depName];
+        treeSize += depTreesSizes[depName];
         await setImmediatePromise();
       } else if (/^file:/.test(dep.version)) {
         depTree.dependencies[dep.name] = createPkgTreeFromDep(dep);
+        treeSize++;
       } else {
         // TODO: also check the package version
         // for a stricter check
@@ -127,8 +134,11 @@ export class PackageLockParser implements LockfileParser {
         }
         depTree.dependencies[dep.name] = createPkgTreeFromDep(dep);
         depTree.dependencies[dep.name].missingLockFileEntry = true;
+        treeSize++;
       }
     }
+
+    depTree.size = treeSize;
     return depTree;
   }
 
@@ -280,7 +290,8 @@ export class PackageLockParser implements LockfileParser {
 
   // Algorithm is based on dynamic programming technique and tries to build
   // "more simple" trees and compose them into bigger ones.
-  private async createDepTrees(depMap: DepMap, depGraph): Promise<{[depPath: string]: PkgTree}> {
+  private async createDepTrees(depMap: DepMap, depGraph):
+    Promise<{depTrees: {[depPath: string]: PkgTree}, depTreesSizes: {[depPath: string]: number}}> {
 
     // Graph has to be acyclic
     if (!graphlib.alg.isAcyclic(depGraph)) {
@@ -288,6 +299,7 @@ export class PackageLockParser implements LockfileParser {
     }
 
     const depTrees: {[depPath: string]: PkgTree} = {};
+    const depTreesSizes: {[depPath: string]: number} = {};
     // topological sort guarantees that when we create a pkg-tree for a dep,
     // all it's sub-trees were already created. This also implies that leaf
     // packages will be processed first as they have no sub-trees.
@@ -296,12 +308,14 @@ export class PackageLockParser implements LockfileParser {
     while (depOrder.length) {
       const depKey = depOrder.shift() as string;
       const dep = depMap[depKey];
+      let treeSize = 1;
 
       // direction is from the dependency to the package requiring it, so we are
       // looking for predecessors
       for (const subDepPath of depGraph.predecessors(depKey)) {
         const subDep = depTrees[subDepPath];
         dep.dependencies[subDep.name] = subDep;
+        treeSize += depTreesSizes[subDepPath];
       }
       const pkgTree: PkgTree = {
         depType: dep.depType,
@@ -316,12 +330,13 @@ export class PackageLockParser implements LockfileParser {
         pkgTree.hasDevDependencies = dep.hasDevDependencies;
       }
       depTrees[depKey] = pkgTree;
+      depTreesSizes[depKey] = treeSize;
       // Since this code doesn't handle any I/O or network, we need to force
       // event loop to tick while being used in server for request processing
       await setImmediatePromise();
     }
 
-    return depTrees;
+    return {depTrees, depTreesSizes};
   }
 
   private flattenLockfile(lockfile: PackageLock): DepMap {
diff --git a/lib/parsers/yarn-lock-parse.ts b/lib/parsers/yarn-lock-parse.ts
index d4dcbbd3..68de56f2 100644
--- a/lib/parsers/yarn-lock-parse.ts
+++ b/lib/parsers/yarn-lock-parse.ts
@@ -35,6 +35,7 @@ export class YarnLockParser implements LockfileParser {
 
   private yarnLockfileParser;
   private eventLoop: EventLoopSpinner;
+  private treeSize: number;
 
   constructor() {
     // @yarnpkg/lockfile doesn't work with Node.js < 6 and crashes just after
@@ -49,6 +50,9 @@ export class YarnLockParser implements LockfileParser {
     // processed in ~150ms. Idea is to let those average requests through in one
     // tick and split only bigger ones.
     this.eventLoop = new EventLoopSpinner(200);
+
+    // Number of dependencies including root one.
+    this.treeSize = 1;
   }
 
   public parseLockFile(lockFileContents: string): YarnLock {
@@ -76,6 +80,7 @@ export class YarnLockParser implements LockfileParser {
       dependencies: {},
       hasDevDependencies: !_.isEmpty(manifestFile.devDependencies),
       name: manifestFile.name,
+      size: 1,
       version: manifestFile.version || '',
     };
 
@@ -93,8 +98,10 @@ export class YarnLockParser implements LockfileParser {
         depTree.dependencies[dep.name] = await this.buildSubTreeRecursiveFromYarnLock(
           dep, yarnLock, [], strict);
       }
+      this.treeSize++;
     }
 
+    depTree.size = this.treeSize;
     return depTree;
   }
 
@@ -138,6 +145,7 @@ export class YarnLockParser implements LockfileParser {
         };
         depSubTree.dependencies[name] = await this.buildSubTreeRecursiveFromYarnLock(
           newDep, lockFile, [...depPath]);
+        this.treeSize++;
       }
     }
 
diff --git a/test/lib/fixtures/dev-deps-only/expected-tree-empty.json b/test/lib/fixtures/dev-deps-only/expected-tree-empty.json
index 20675e1f..97c88182 100644
--- a/test/lib/fixtures/dev-deps-only/expected-tree-empty.json
+++ b/test/lib/fixtures/dev-deps-only/expected-tree-empty.json
@@ -1,5 +1,6 @@
 {
   "name": "pkg-dev-deps-only",
+  "size": 1,
   "version": "0.0.1",
   "hasDevDependencies": true,
   "dependencies": {}
diff --git a/test/lib/fixtures/dev-deps-only/expected-tree.json b/test/lib/fixtures/dev-deps-only/expected-tree.json
index b574f36c..1a771fd3 100644
--- a/test/lib/fixtures/dev-deps-only/expected-tree.json
+++ b/test/lib/fixtures/dev-deps-only/expected-tree.json
@@ -1,5 +1,6 @@
 {
   "name": "pkg-dev-deps-only",
+  "size": 3,
   "version": "0.0.1",
   "hasDevDependencies": true,
   "dependencies": {
diff --git a/test/lib/fixtures/external-tarball/expected-tree.json b/test/lib/fixtures/external-tarball/expected-tree.json
index fe3a01d7..c8ecc389 100644
--- a/test/lib/fixtures/external-tarball/expected-tree.json
+++ b/test/lib/fixtures/external-tarball/expected-tree.json
@@ -98,5 +98,6 @@
   },
   "hasDevDependencies": false,
   "name": "external-tarball",
+  "size": 16,
   "version": ""
 }
diff --git a/test/lib/fixtures/file-as-version/expected-tree.json b/test/lib/fixtures/file-as-version/expected-tree.json
index 61dadeaa..a4277d6b 100644
--- a/test/lib/fixtures/file-as-version/expected-tree.json
+++ b/test/lib/fixtures/file-as-version/expected-tree.json
@@ -22,5 +22,6 @@
   },
   "hasDevDependencies": false,
   "name": "pkg-dev-deps-only",
+  "size": 4,
   "version": "0.0.1"
 }
diff --git a/test/lib/fixtures/git-ssh-url-deps/expected-tree.json b/test/lib/fixtures/git-ssh-url-deps/expected-tree.json
index a7fa5b33..f0f3b690 100644
--- a/test/lib/fixtures/git-ssh-url-deps/expected-tree.json
+++ b/test/lib/fixtures/git-ssh-url-deps/expected-tree.json
@@ -98,5 +98,6 @@
   },
   "hasDevDependencies": false,
   "name": "git-ssh-url-deps",
+  "size": 16,
   "version": ""
 }
diff --git a/test/lib/fixtures/goof/dep-tree-no-dev-deps-yarn.json b/test/lib/fixtures/goof/dep-tree-no-dev-deps-yarn.json
index b0a6bd55..99b80b9e 100644
--- a/test/lib/fixtures/goof/dep-tree-no-dev-deps-yarn.json
+++ b/test/lib/fixtures/goof/dep-tree-no-dev-deps-yarn.json
@@ -5854,5 +5854,6 @@
   },
   "hasDevDependencies": true,
   "name": "goof",
-  "version": "0.0.3"
+  "version": "0.0.3",
+  "size": 914
 }
diff --git a/test/lib/fixtures/goof/dep-tree-no-dev-deps.json b/test/lib/fixtures/goof/dep-tree-no-dev-deps.json
index 4765bbf9..e31bd4ae 100644
--- a/test/lib/fixtures/goof/dep-tree-no-dev-deps.json
+++ b/test/lib/fixtures/goof/dep-tree-no-dev-deps.json
@@ -1,6 +1,7 @@
 {
   "name": "goof",
   "version": "0.0.3",
+  "size": 910,
   "hasDevDependencies": true,
   "dependencies": {
     "adm-zip": {
diff --git a/test/lib/fixtures/goof/dep-tree-with-dev-deps-yarn.json b/test/lib/fixtures/goof/dep-tree-with-dev-deps-yarn.json
index e42c4626..5022a6a0 100644
--- a/test/lib/fixtures/goof/dep-tree-with-dev-deps-yarn.json
+++ b/test/lib/fixtures/goof/dep-tree-with-dev-deps-yarn.json
@@ -11450,5 +11450,6 @@
   },
   "hasDevDependencies": true,
   "name": "goof",
-  "version": "0.0.3"
+  "version": "0.0.3",
+  "size": 1795
 }
diff --git a/test/lib/fixtures/goof/dep-tree-with-dev-deps.json b/test/lib/fixtures/goof/dep-tree-with-dev-deps.json
index 64b9e6f7..8986d98d 100644
--- a/test/lib/fixtures/goof/dep-tree-with-dev-deps.json
+++ b/test/lib/fixtures/goof/dep-tree-with-dev-deps.json
@@ -11425,5 +11425,6 @@
   },
   "hasDevDependencies": true,
   "name": "goof",
-  "version": "0.0.3"
+  "version": "0.0.3",
+  "size": 1791
 }
diff --git a/test/lib/fixtures/missing-deps/expected-tree.json b/test/lib/fixtures/missing-deps/expected-tree.json
index 440cae04..c17652e9 100644
--- a/test/lib/fixtures/missing-deps/expected-tree.json
+++ b/test/lib/fixtures/missing-deps/expected-tree.json
@@ -1,5 +1,6 @@
 {
   "name": "pkg-missing-deps",
+  "size": 1,
   "version": "1.0.0",
   "hasDevDependencies": false,
   "dependencies": {}
diff --git a/test/lib/fixtures/out-of-sync-tree/expected-tree.json b/test/lib/fixtures/out-of-sync-tree/expected-tree.json
index 64d6247e..6749e9d6 100644
--- a/test/lib/fixtures/out-of-sync-tree/expected-tree.json
+++ b/test/lib/fixtures/out-of-sync-tree/expected-tree.json
@@ -188,5 +188,6 @@
   },
   "hasDevDependencies": true,
   "name": "out-of-sync-small",
+  "size": 30,
   "version": "1.0.0"
 }
diff --git a/test/lib/fixtures/out-of-sync/expected-tree.json b/test/lib/fixtures/out-of-sync/expected-tree.json
index a26568c4..2c293be9 100644
--- a/test/lib/fixtures/out-of-sync/expected-tree.json
+++ b/test/lib/fixtures/out-of-sync/expected-tree.json
@@ -38,5 +38,6 @@
   },
   "hasDevDependencies": true,
   "name": "trucolor",
+  "size": 6,
   "version": "0.7.1"
 }
diff --git a/test/lib/fixtures/package-repeated-in-manifest/expected-tree.json b/test/lib/fixtures/package-repeated-in-manifest/expected-tree.json
index e8b225e0..30de291b 100644
--- a/test/lib/fixtures/package-repeated-in-manifest/expected-tree.json
+++ b/test/lib/fixtures/package-repeated-in-manifest/expected-tree.json
@@ -1,5 +1,6 @@
 {
   "name": "goof",
+  "size": 17,
   "version": "0.0.3",
   "hasDevDependencies": true,
   "dependencies": {