diff --git a/src/mem.rs b/src/mem.rs
index a495a44..96fdc75 100644
--- a/src/mem.rs
+++ b/src/mem.rs
@@ -44,6 +44,11 @@ impl MemoryContext {
         unsafe { raw::MemoryContextSwitchTo(prev) };
         result
     }
+
+    pub(crate) fn memory_allocated(&self) -> usize {
+        // SAFETY: `self.0` is always a valid memory context
+        unsafe { &*self.0 }.mem_allocated
+    }
 }
 
 // SAFETY: This will never have any parents, so we don't need to worry about
diff --git a/src/owned.rs b/src/owned.rs
index 761abdc..0f07c0d 100644
--- a/src/owned.rs
+++ b/src/owned.rs
@@ -6,7 +6,7 @@ use std::ops::Deref;
 /// An owned version of a node
 pub struct Owned<T> {
     /// The memory context the node is allocated onto
-    _mem: mem::MemoryContext,
+    mem: mem::MemoryContext,
     /// A pointer to a node allocated onto [_mem]
     ptr: *mut raw::Node,
     _marker: PhantomData<T>,
@@ -21,11 +21,15 @@ unsafe impl<T> Sync for Owned<T> {}
 impl<T> Owned<T> {
     pub(crate) fn new(mem: mem::MemoryContext, ptr: *mut raw::Node) -> Self {
         Self {
-            _mem: mem,
+            mem,
             ptr,
             _marker: PhantomData,
         }
     }
+
+    pub fn memory_allocated(&self) -> usize {
+        self.mem.memory_allocated()
+    }
 }
 
 impl<T> Deref for Owned<T>