diff --git a/include/cglm/box.h b/include/cglm/box.h
index 89ef5a9..7032339 100644
--- a/include/cglm/box.h
+++ b/include/cglm/box.h
@@ -177,4 +177,26 @@ glm_aabb_isvalid(vec3 box[2]) {
          && glm_vec_min(box[1]) != -FLT_MAX;
 }
 
+/*!
+ * @brief distance between of min and max
+ *
+ * @param[in]  box bounding box
+ */
+CGLM_INLINE
+float
+glm_aabb_size(vec3 box[2]) {
+  return glm_vec_distance(box[0], box[1]);
+}
+
+/*!
+ * @brief radius of sphere which surrounds AABB
+ *
+ * @param[in]  box bounding box
+ */
+CGLM_INLINE
+float
+glm_aabb_radius(vec3 box[2]) {
+  return glm_aabb_size(box) * 0.5f;
+}
+
 #endif /* cglm_box_h */