diff --git a/make_helpers/utilities.mk b/make_helpers/utilities.mk
index 62769fb..5bb1806 100644
--- a/make_helpers/utilities.mk
+++ b/make_helpers/utilities.mk
@@ -20,3 +20,31 @@
 directory-name = $(call decompat-path,$(dir $(call compat-path,$(1))))
 
 escape-shell = '$(subst ','\'',$(1))'
+
+#
+# Upper-case a string value.
+#
+# Parameters:
+#
+#   - $(1): The string to upper-case.
+#
+# Example usage:
+#
+#     $(call uppercase,HeLlO wOrLd) # "HELLO WORLD"
+#
+
+uppercase = $(shell echo $(call escape-shell,$(1)) | tr '[:lower:]' '[:upper:]')
+
+#
+# Lower-case a string value.
+#
+# Parameters:
+#
+#   - $(1): The string to lower-case.
+#
+# Example usage:
+#
+#     $(call lowercase,HeLlO wOrLd) # "hello world"
+#
+
+lowercase = $(shell echo $(call escape-shell,$(1)) | tr '[:upper:]' '[:lower:]')