diff --git a/src/main/java/com/oath/halodb/HaloDB.java b/src/main/java/com/oath/halodb/HaloDB.java
index cae6236..2424406 100644
--- a/src/main/java/com/oath/halodb/HaloDB.java
+++ b/src/main/java/com/oath/halodb/HaloDB.java
@@ -40,6 +40,10 @@ public byte[] get(byte[] key) throws HaloDBException {
         }
     }
 
+    public int size(byte[] key) {
+        return dbInternal.size(key);
+    }
+
     public boolean put(byte[] key, byte[] value) throws HaloDBException {
         try {
             return dbInternal.put(key, value);
diff --git a/src/main/java/com/oath/halodb/HaloDBInternal.java b/src/main/java/com/oath/halodb/HaloDBInternal.java
index 8216db9..ee47597 100644
--- a/src/main/java/com/oath/halodb/HaloDBInternal.java
+++ b/src/main/java/com/oath/halodb/HaloDBInternal.java
@@ -414,6 +414,15 @@ long size() {
         return inMemoryIndex.size();
     }
 
+    int size(byte[] key) {
+        InMemoryIndexMetaData metaData = inMemoryIndex.get(key);
+        if (metaData == null) {
+            return -1;
+        }
+
+        return metaData.getValueSize();
+    }
+
     void setIOErrorFlag() throws IOException {
         DBMetaData metaData = new DBMetaData(dbDirectory);
         metaData.loadFromFileIfExists();