diff a/src/java.base/share/classes/java/util/Objects.java b/src/java.base/share/classes/java/util/Objects.java
--- a/src/java.base/share/classes/java/util/Objects.java
+++ b/src/java.base/share/classes/java/util/Objects.java
@@ -25,10 +25,11 @@
 
 package java.util;
 
 import jdk.internal.util.Preconditions;
 import jdk.internal.vm.annotation.ForceInline;
+import jdk.internal.misc.Unsafe;
 
 import java.util.function.Supplier;
 
 /**
  * This class consists of {@code static} utility methods for operating
@@ -423,6 +424,16 @@
     public static
     int checkFromIndexSize(int fromIndex, int size, int length) {
         return Preconditions.checkFromIndexSize(fromIndex, size, length, null);
     }
 
+    /**
+     * Return the size of the object in the heap.
+     *
+     * @param o an object
+     * @return the objects's size
+     * @since Valhalla
+     */
+    public static long getObjectSize(Object o) {
+        return Unsafe.getUnsafe().getObjectSize(o);
+    }
 }