diff --git a/include/squirrel_keymap.h b/include/squirrel_keymap.h
index bba0f71..c982e69 100644
--- a/include/squirrel_keymap.h
+++ b/include/squirrel_keymap.h
@@ -2,6 +2,7 @@
 #define SQUIRREL_KEYMAP_H
 #include "squirrel_key.h"
 
+int key_index_from_xy(int x, int y, int width);
 struct key nop(void);
 struct key keyboard(uint8_t keycode);
 struct key keyboard_modifier(uint8_t modifier);
diff --git a/src/squirrel_keymap.c b/src/squirrel_keymap.c
index ada945f..4cbc6ce 100644
--- a/src/squirrel_keymap.c
+++ b/src/squirrel_keymap.c
@@ -2,6 +2,8 @@
 #include "squirrel_quantum.h"
 #include <stdlib.h>
 
+int key_index_from_xy(int x, int y, int width) { return y * width + x; }
+
 struct key nop(void) {
   return (struct key){
       .pressed = key_nop,