diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
index b2a8e5b0..03962d7d 100644
--- a/include/libcamera/geometry.h
+++ b/include/libcamera/geometry.h
@@ -67,7 +67,9 @@ static inline bool operator>=(const Size &lhs, const Size &rhs)
 	return !(lhs < rhs);
 }
 
-struct SizeRange {
+class SizeRange
+{
+public:
 	SizeRange()
 	{
 	}
@@ -90,6 +92,8 @@ struct SizeRange {
 	{
 	}
 
+	std::string toString() const;
+
 	Size min;
 	Size max;
 	unsigned int hStep;
diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
index 1ea10293..e598f6ad 100644
--- a/src/libcamera/geometry.cpp
+++ b/src/libcamera/geometry.cpp
@@ -266,6 +266,20 @@ bool operator<(const Size &lhs, const Size &rhs)
  * \brief The vertical step
  */
 
+/**
+ * \brief Assemble and return a string describing the size range
+ * \return A string describing the SizeRange
+ */
+std::string SizeRange::toString() const
+{
+	std::stringstream ss;
+
+	ss << "(" << min.toString() << ")-(" << max.toString() << ")/(+"
+	   << hStep << ",+" << vStep << ")";
+
+	return ss.str();
+}
+
 /**
  * \brief Compare size ranges for equality
  * \return True if the two size ranges are equal, false otherwise