diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java b/modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java
index 64a4526cc2b..acf7e7c40a8 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java
@@ -579,7 +579,7 @@ public class RobinEngine extends AbstractIndexShardComponent implements Engine,
         rwl.readLock().lock();
         try {
             long bytes = IndexWriters.estimateRamSize(indexWriter);
-            bytes += translog.estimateMemorySize().bytes();
+            bytes += translog.memorySizeInBytes();
             return new ByteSizeValue(bytes);
         } catch (Exception e) {
             return null;
diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/index/shard/IndexShardManagement.java b/modules/elasticsearch/src/main/java/org/elasticsearch/index/shard/IndexShardManagement.java
index 79f6be367e6..eb528e28f4b 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/index/shard/IndexShardManagement.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/index/shard/IndexShardManagement.java
@@ -22,6 +22,7 @@ package org.elasticsearch.index.shard;
 import org.elasticsearch.common.component.CloseableComponent;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.index.engine.Engine;
 import org.elasticsearch.index.settings.IndexSettings;
 import org.elasticsearch.index.shard.service.IndexShard;
@@ -97,7 +98,7 @@ public class IndexShardManagement extends AbstractIndexShardComponent implements
 
     @ManagedAttribute(description = "Estimated size in memory the transaction log takes")
     public String getTranslogSize() {
-        return translog.estimateMemorySize().toString();
+        return new ByteSizeValue(translog.memorySizeInBytes()).toString();
     }
 
     @ManagedAttribute(description = "The state of the shard")
diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/index/translog/Translog.java b/modules/elasticsearch/src/main/java/org/elasticsearch/index/translog/Translog.java
index 0540e16d5db..98d0a218eb1 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/index/translog/Translog.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/index/translog/Translog.java
@@ -26,7 +26,6 @@ import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.io.stream.Streamable;
 import org.elasticsearch.common.lease.Releasable;
-import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.common.util.concurrent.NotThreadSafe;
 import org.elasticsearch.common.util.concurrent.ThreadSafe;
 import org.elasticsearch.index.engine.Engine;
@@ -54,7 +53,9 @@ public interface Translog extends IndexShardComponent {
     /**
      * The estimated memory size this translog is taking.
      */
-    ByteSizeValue estimateMemorySize();
+    long memorySizeInBytes();
+
+    long translogSizeInBytes();
 
     /**
      * Creates a new transaction log internally. Note, users of this class should make
diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/index/translog/fs/FsTranslog.java b/modules/elasticsearch/src/main/java/org/elasticsearch/index/translog/fs/FsTranslog.java
index 4edd4ef7a67..7634e091c06 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/index/translog/fs/FsTranslog.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/index/translog/fs/FsTranslog.java
@@ -23,8 +23,6 @@ import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.io.stream.BytesStreamOutput;
 import org.elasticsearch.common.io.stream.CachedStreamOutput;
 import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.unit.ByteSizeUnit;
-import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.env.NodeEnvironment;
 import org.elasticsearch.index.settings.IndexSettings;
 import org.elasticsearch.index.shard.AbstractIndexShardComponent;
@@ -91,8 +89,12 @@ public class FsTranslog extends AbstractIndexShardComponent implements Translog
         return operationCounter.get();
     }
 
-    @Override public ByteSizeValue estimateMemorySize() {
-        return new ByteSizeValue(0, ByteSizeUnit.BYTES);
+    @Override public long memorySizeInBytes() {
+        return 0;
+    }
+
+    @Override public long translogSizeInBytes() {
+        return lastWrittenPosition.get();
     }
 
     @Override public void clearUnreferenced() {