diff --git a/c-programming/math/be_to_le_ptr.h b/c-programming/math/be_to_le_ptr.h
new file mode 100644
index 0000000..c69f1a7
--- /dev/null
+++ b/c-programming/math/be_to_le_ptr.h
@@ -0,0 +1,11 @@
+/*
+ * be_to_le_ptr.h
+ *
+ * Useful for showing big-endian hexadecimal dumps on little-endian machines
+ *
+ * Author: Intel A80486DX2-66
+ * License: Creative Commons Zero 1.0 Universal
+ */
+
+#define BE_TO_LE_PTR(base, size, i)                                           \
+    (base) + ((size) * ((i) / (size)) + ((size) - 1) - ((i) % (size)))